List of the Cenozoic life of California

This list of the Cenozoic life of California contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of California and are between 66 million and 10,000 years of age.

• †Abantis
  • †Abantis velifer
• Abies
  • †Abies concoloroides
  • †Abies klamathensis
• †Aboma
  • †Aboma antiqua – type locality for species
• †Acalypha
  • †Acalypha aequalis
• Acanthina
  • †Acanthina spirata
• Acanthocardia
  • †Acanthocardia brewerii – type locality for species
  • †Acanthocardia sorrentoense
• Acar
  • †Acar bailyi – or unidentified comparable form
• Accipiter
  • †Accipiter velox
• Acentrophryne
  • †Acentrophryne longidens
• Acer
  • †Acer aequidentatum
  • †Acer scottiae
• Acesta
  • †Acesta multiradiata
• †Achaenodon
  • †Achaenodon robustus – or unidentified comparable form
• Acila
  • †Acila castrensis
  • †Acila conradi
  • †Acila decisa
  • †Acila gabbiana
  • †Acila muta
  • †Acila semirostrata – or unidentified comparable form
  • †Acila shumardi
• Acipenser

  • 

    †Acipenser medirostris – or unidentified comparable form
• Acmaea
  • †Acmaea dickersoni – or unidentified related form
  • †Acmaea digitalis – or unidentified comparable form
  • †Acmaea insessa
  • †Acmaea limatula
  • †Acmaea mitra
  • †Acmaea persona
  • †Acmaea ruckmani – or unidentified comparable form
  • †Acmaea tejonensis – or unidentified comparable form

• 

  †Acritohippus
  • †Acritohippus isonesus – or unidentified comparable form
  • †Acritohippus quinni – type locality for species
  • †Acritohippus stylodontus
  • †Acritohippus tertius – or unidentified comparable form
• †Acritoparamys – or unidentified comparable form
• Acteocina
  • †Acteocina culcitella
  • †Acteocina inculta
  • †Acteocina magdalensis
• Acteon
  • †Acteon boulderanus
  • †Acteon lawsoni
  • †Acteon punctocaelatus
  • †Acteon traski
• Actinemys

  • 

    †Actinemys marmorata
• †Acutostrea
  • †Acutostrea idriaensis
  • †Acutostrea miguelensis
• Admete
  • †Admete rhyssa
• Adula
  • †Adula californiensis
  • †Adula diegensis
• Aechmophorus
  • †Aechmophorus elasson
  • †Aechmophorus occidentalis
• †Aechomophorus
  • †Aechomophorus occidentalis
• †Aeila
  • †Aeila decisa
• †Aelurodon
  • †Aelurodon asthenostylus
  • †Aelurodon taxoides

• 

  †Aepycamelus
  • †Aepycamelus alexandrae
• Aequipecten
  • †Aequipecten andersoni
• Aesopus
  • †Aesopus chrysalloides
• Aethia
  • †Aethia barnesi – type locality for species
  • †Aethia rossmoori – type locality for species
• †Aethomylos
  • †Aethomylos simplicidens
• Agaronia
  • †Agaronia mathewsoni – or unidentified comparable form
  • †Agaronia mathewsonii – or unidentified comparable form
• †Agasoma
  • †Agasoma acuminatum
  • †Agasoma gravida
  • †Agasoma gravidum
  • †Agasoma kerrianum
  • †Agasoma sinuata
• Agelaius
  • †Agelaius phoeniceuus

• 

  †Agriotherium
• †Ailanthus
  • †Ailanthus lesquereuxi
• Akera
  • †Akera maga
• Alaba
  • †Alaba catalinensis
  • †Alaba jeannettae
• Alabina
  • †Alabina io – or unidentified comparable form
  • †Alabina tenuisculpta
• †Albicetus
  • †Albicetus oxymycterus – type locality for species
• †Albireo
  • †Albireo savagei – type locality for species
• Alca
• †Alcodes
  • †Alcodes ulnulus – type locality for species
• Aleochara
• Aletes
  • †Aletes squamigerus

• 

  †Aletomeryx
  • †Aletomeryx occidentalis – type locality for species
• †Alforjas
• Aligena
  • †Aligena cerritensis
• †Alilepus
  • †Alilepus hibbardi
• †Alisea – type locality for genus
  • †Alisea grandis – type locality for species
• †Allodelphis – type locality for genus
  • †Allodelphis pratti – type locality for species
  • †Allodelphis woodburnei – type locality for species

• 

  †Allodesmus
  • †Allodesmus gracilis – type locality for species
  • †Allodesmus kelloggi – type locality for species
  • †Allodesmus kernensis
• †Alluvisorex
  • †Alluvisorex chasseae – type locality for species
• Alnus
  • †Alnus corrallina
  • †Alnus operia
• †Alopecocyon – type locality for genus
  • †Alopecocyon leardi – type locality for species
• Alopias
  • †Alopias exigua – or unidentified comparable form
  • †Alopias latidens

  • 

    †Alopias vulpinus – or unidentified comparable form
• Alvania
  • †Alvania acutelirata
  • †Alvania compacta
  • †Alvania iliuliukensis – or unidentified related form
• †Alveojunctus
  • †Alveojunctus bowni – type locality for species
• Amaea
• Amara
  • †Amara insignis
• †Amaurellina
  • †Amaurellina caleocia
  • †Amaurellina martinezensis
  • †Amaurellina moragai
• Amauropsis
  • †Amauropsis alveata

• 

  Amelanchier
• Amiantis
  • †Amiantis – type locality for species informal
  • †Amiantis callosa
  • †Amiantis diabloensis
  • †Amiantis mathewsoni
• Ammobaculites
  • †Ammobaculites cubensis
  • †Ammobaculites strathearnensis – type locality for species
• Ammospermophilus
  • †Ammospermophilus fossilis
• †Amorpha
  • †Amorpha condonii
  • †Amorpha oklahomensis
• †Amphicyon
  • †Amphicyon ingens

• 

  †Amphimachairodus
  • †Amphimachairodus coloradensis – or unidentified comparable form
• Amphimorphina
  • †Amphimorphina ignota
• Amphissa
  • †Amphissa columbiana
  • †Amphissa reticulata
  • †Amphissa ventricosa
  • †Amphissa versicolor
• Amphiura
  • †Amphiura santaecrucis
• †Amphora
  • †Amphora ovalis
  • †Amphora perpusilla
• †Ampullina
  • †Ampullina schencki – or unidentified comparable form
• Amusium
  • †Amusium lompocensis
• †Amussiopecten
  • †Amussiopecten vanvlecki
• †Amynodon
  • †Amynodon advenus – or unidentified comparable form
  • †Amynodon reedi
• †Amynodontopsis
  • †Amynodontopsis bodei – type locality for species
• Anachis
  • †Anachis coronata

• 

  Anadara
  • †Anadara devincta
  • †Anadara obispoana
  • †Anadara osmonti
  • †Anadara perlabiata
  • †Anadara reinharti
  • †Anadara rivulata
  • †Anadara santana – type locality for species
  • †Anadara submontereyana
  • †Anadara trilineata
• Anaphothrips
  • †Anaphothrips vitreus – type locality for species
• Anas
  • †Anas americana
  • †Anas carolinense
  • †Anas clypeata
  • †Anas platyrhynchos
• †Anchitheriomys – or unidentified comparable form

• 

  †Anchitherium
  • †Anchitherium clarencei
• †Anchura
  • †Anchura baptos
• Ancilla
  • †Ancilla fishii
  • †Ancilla gabbi – tentative report
• †Angelosquilla
  • †Angelosquilla altamirensis
• Angulogerina
• Angulus
  • †Angulus buttoni
  • †Angulus castacana
  • †Angulus joaquinensis
  • †Angulus jollaensis – or unidentified comparable form
  • †Angulus longa
  • †Angulus lutea – or unidentified comparable form
• Anniella
• Anodontia
  • †Anodontia edentuloides
  • †Anodontia inflata
• †Anomalina
  • †Anomalina californiensis
  • †Anomalina garzaensis
• Anomalinoides
  • †Anomalinoides globosa – or unidentified comparable form
• Anomia
  • †Anomia mcgoniglensis
  • †Anomia peruviana
  • †Anomia vaquerosensis – type locality for species
• †Ansen
  • †Ansen albifrons
• Anser
  • †Anser albifrons
• †Antecalomys
  • †Antecalomys valensis
  • †Antecalomys vasquezi
• †Antiacodon
  • †Antiacodon venustus
• Antigona
  • †Antigona undosa
• †Antilla
  • †Antilla batequensis

• 

  Antilocapra
• Antrozous
  • †Antrozous pallidus
• †Anzanycteris
  • †Anzanycteris anzensis
• †Apataelurus – or unidentified comparable form
• †Apatemys
  • †Apatemys bellus
  • †Apatemys downsi – type locality for species
  • †Apatemys uintensis
• Aphelocoma
  • †Aphelocoma californica
• †Aphelophlebodes – type locality for genus
  • †Aphelophlebodes stocki – type locality for species

• 

  †Aphelops
  • †Aphelops megalodus
• Apiotoma
  • †Apiotoma californiana
• Aplodontia
  • †Aplodontia rufa
• Aprionodon
• Apsena
  • †Apsena laticornis – type locality for species
  • †Apsena pubescens
  • †Apsena rufipes
• Aquila

  • 

    Aquila chrysaetos
• †Araeosteus
  • †Araeosteus rothi
• Arbutus
  • †Arbutus matthesii
• Arca
  • †Arca hornii – type locality for species
  • †Arca montereyana
  • †Arca pacifica – or unidentified comparable form
  • †Arca santaclarana
  • †Arca sisquocensis
  • †Arca terminumbonis
• †Arceuthobium

• 

  †Archaeocyon
  • †Archaeocyon pavidus
• †Archaeohippus
  • †Archaeohippus mourningi
  • †Archaeohippus ultimus
• †Archaeolagus
  • †Archaeolagus acaricolus – type locality for species
• †Archaeolithothamnion
  • †Archaeolithothamnion keenanii – or unidentified related form
• Archaeolithothamnium
  • †Archaeolithothamnium keenani – type locality for species
• †Archaeoparadoxia
  • †Archaeoparadoxia weltoni – type locality for species
• †Archibuteo
  • †Archibuteo ferrugineus

• 

  Architectonica
  • †Architectonica cognata
  • †Architectonica llajasensis – type locality for species
  • †Architectonica nobilis
  • †Architectonica tuberculata
  • †Architectonica ullreyana – or unidentified comparable form
• †Archoheia – tentative report
• Archoplites
  • †Archoplites interruptus
• Arcinella
  • †Arcinella californica
• Arctica – tentative report
  • †Arctica weaveri
• Arctocephalus

• 

  †Arctodus
  • †Arctodus simus – type locality for species
• †Arctostaphylos
• Ardea
  • †Ardea herodias
• Arenaria
  • †Arenaria melanocephala
• Arene
  • †Arene mcleani – type locality for species
• †Argenna
  • †Argenna fossilis – type locality for species
• Argobuccinum
  • †Argobuccinum katherineae – type locality for species
  • †Argobuccinum oregonensis
• Argopecten
  • †Argopecten deserti
  • †Argopecten gibbus
  • †Argopecten mendenhalli
  • †Argopecten purpuratus
  • †Argopecten ventricosus
• †Argyrocetus – type locality for genus
  • †Argyrocetus bakersfieldensis – type locality for species
  • †Argyrocetus joaquinensis – type locality for species

• 

  Argyropelecus
  • †Argyropelecus bullocki – type locality for species
  • †Argyropelecus bullockii
• †Arnoldina – type locality for genus
  • †Arnoldina iniistia – type locality for species
• Arossia
• †Artocarpus
  • †Artocarpus lessigiana
• †Asclepiadites
  • †Asclepiadites laterita – type locality for species

• 

  Asio
  • †Asio priscus
  • †Asio wilsonianus
• Asterigerina
  • †Asterigerina crassaformis
• Astraea
  • †Astraea biangulata – or unidentified comparable form
  • †Astraea gibbosa
  • †Astraea gradata
  • †Astraea morani – type locality for species
  • †Astraea undosa
• Astrangia
  • †Astrangia grandis – type locality for species
  • †Astrangia insignifica – type locality for species
• †Astrocoenia – tentative report
• †Astrocoenta
• †Astrodapsis
  • †Astrodapsis arnoldi – or unidentified comparable form
  • †Astrodapsis cuyamanus
  • †Astrodapsis fernandoensis
  • †Astrodapsis merriami – tentative report
  • †Astrodapsis spatiosus
• †Astrodaspis
  • †Astrodaspis arnoldi
• Astropecten
• Astyris
  • †Astyris gausapata
• Athene
  • †Athene cunicularia
• Athleta
  • †Athleta roddai – type locality for species

• 

  †Atocetus
  • †Atocetus nasalis – type locality for species
• †Atopotarus – type locality for genus
  • †Atopotarus courseni – type locality for species
• Atrina
  • †Atrina alamedensis
• †Aturia
  • †Aturia angustata
  • †Aturia dickersoni – type locality for species
  • †Aturia kerniana – type locality for species
  • †Aturia myrlae – type locality for species
• †Aturoidea
  • †Aturoidea mathewsonii – type locality for species
• Atys

• 

  †Aulophyseter – type locality for genus
  • †Aulophyseter morricei – type locality for species
• Austrotrophon
• †Auxides
  • †Auxides sanctaemonicae
• †Avipeda
• Aythya
  • †Aythya affinis
  • †Aythya valisineria
• †Azalois – type locality for genus
  • †Azalois angelensis – type locality for species

• Baiomys
  • †Baiomys mowi
• Balaenoptera
  • †Balaenoptera bertae – type locality for species
  • †Balaenoptera cortesi
  • †Balaenoptera davidsonii – type locality for species
  • †Balaenoptera physalus
  • †Balaenoptera ryani

• 

  †Balaenula
• Balanophyllia
  • †Balanophyllia elegans
  • †Balanophyllia variabilis – type locality for species
• Balanus
  • †Balanus crenatus
  • †Balanus gregarius
  • †Balanus nubilus – or unidentified comparable form
  • †Balanus rostratus
• Balcis
  • †Balcis micans
  • †Balcis monicensis
  • †Balcis oldroydi
  • †Balcis rutila
  • †Balcis thersites
• Bankia
  • †Bankia setacea – or unidentified comparable form
• Barbarofusus
  • †Barbarofusus barbarensis
• Barbatia
  • †Barbatia cliffensis
  • †Barbatia landesi – or unidentified related form
  • †Barbatia strongi – type locality for species
  • †Barbatia suzzalloi – or unidentified comparable form

• 

  †Barbourofelis
  • †Barbourofelis loveorum
  • †Barbourofelis whitfordi
• Barleeia
  • †Barleeia marmorea
• Barnea
  • †Barnea costata
• †Basirepomys
  • †Basirepomys pliocenicus – type locality for species
• Bassariscus
  • †Bassariscus antiquus
  • †Bassariscus astutus – or unidentified comparable form
  • †Bassariscus casei
  • †Bassariscus raptor
• †Bathylagus – type locality for genus
  • †Bathylagus quiescens – type locality for species
  • †Bathylagus quisquilia – type locality for species
• †Bathysiphon
  • †Bathysiphon eocenica
  • †Bathysiphon sanctaecrucis
• Bathytoma
  • †Bathytoma pacifica
• †Batodonoides
  • †Batodonoides powayensis
  • †Batodonoides walshi – type locality for species

• 

  Bembidion
  • †Bembidion davidae – type locality for species
  • †Bembidion everestae – type locality for species
• †Benoistia
  • †Benoistia cantonensis
• †Bensonomys
  • †Bensonomys arizonae
  • †Bensonomys gidleyi
  • †Bensonomys meadensis
• Beringraja
  • †Beringraja binoculata – or unidentified comparable form
• †Bestiopeda
• Betula
  • †Betula ashleyii
• †Bifarina
  • †Bifarina eleganta
• Bison
  • †Bison antiquus

  • 

    †Bison latifrons
• Bittium
  • †Bittium alternatum – or unidentified comparable form
  • †Bittium asperum
  • †Bittium casmaliense
  • †Bittium catalinense
  • †Bittium dumblei
  • †Bittium eschrichti
  • †Bittium eschrichtii
  • †Bittium inerfossa
  • †Bittium interfossa
  • †Bittium latum
  • †Bittium ornatissimum
  • †Bittium rugatum
  • †Bittium topangensis
• Bivetopsia
  • †Bivetopsia bullata
• †Boavus
  • †Boavus affinis – type locality for species
• Boetica
  • †Boetica hertleini

• 

  †Bolbocara
  • †Bolbocara gyrinus
• Bolinichthys
• Bolivina
  • †Bolivina gracilis
• Bonasa
  • †Bonasa umbellus
• †Bonellitia
  • †Bonellitia paucivaricata
  • †Bonellitia stantoni
• Bornia
  • †Bornia retifera

• 

  †Borophagus
  • †Borophagus diversidens
  • †Borophagus littoralis – type locality for species
  • †Borophagus parvus
  • †Borophagus secundus
• †Borophryne
  • †Borophryne apogon
• †Bouromeryx
  • †Bouromeryx americanus
  • †Bouromeryx submilleri – or unidentified comparable form
• Brachidontes
  • †Brachidontes cowlitzensis
  • †Brachidontes dichotomus
  • †Brachidontes lawsoni – or unidentified comparable form
  • †Brachidontes ornatus
• Brachiodontes
  • †Brachiodontes lawsoni
• †Brachisphingus
  • †Brachisphingus gabbi
• †Brachyallodesmus – type locality for genus
  • †Brachyallodesmus packardi

• 

  †Brachycrus
  • †Brachycrus buwaldi
  • †Brachycrus laticeps
• †Brachyerix
  • †Brachyerix incertis
• †Brachypsalis
  • †Brachypsalis obliquidens
  • †Brachypsalis pachycephalus – or unidentified comparable form
• Brachyramphus
  • †Brachyramphus dunkeli – type locality for species
  • †Brachyramphus pliocenum – type locality for species
• †Brachysphingus
  • †Brachysphingus liratus
  • †Brachysphingus mammilatus – type locality for species
  • †Brachysphingus sinuatus

• 

  Branta
  • †Branta canadensis
  • †Branta nigricans – tentative report
  • †Branta woolfendeni – or unidentified comparable form
• †Bretzia
• †Brevirostrodelphis – Type locality for genus
  • †Brevirostrodelphis dividum - Type locality for species (synonym Delphinodon dividum)^[1]
• †Brochopleurus – tentative report
• †Bruclarkia
  • †Bruclarkia barkerianum
  • †Bruclarkia barkerium
  • †Bruclarkia columbiana
  • †Bruclarkia gravida
  • †Bruclarkia oregonensis – or unidentified comparable form
  • †Bruclarkia santacruzana
  • †Bruclarkia seattlensis
• Bubo
  • †Bubo sinclairi – type locality for species

  • 

    †Bubo virginianus
• Buccinum
  • †Buccinum strigillatum
• Bucephala
  • †Bucephala albeola
• †Bucida
  • †Bucida eocenica
• Bufo
• †Bulbiceps
  • †Bulbiceps raninus
• †Bulbifusus
  • †Bulbifusus californicus – type locality for species
• Bulimina
  • †Bulimina chirana
  • †Bulimina debilis
  • †Bulimina jacksonensis
  • †Bulimina ovata
  • †Bulimina ovula
  • †Bulimina rinconensis
  • †Bulimina socialis – or unidentified comparable form
• Buliminella
  • †Buliminella curta
  • †Buliminella subfusiformis
• Bulla
  • †Bulla clarki

  • 

    †Bulla gouldiana
  • †Bulla punctulata – or unidentified comparable form
  • †Bulla punctulatus
  • †Bulla striata
• Bullia
  • †Bullia clarki
• †Bullinula
  • †Bullinula subglobosa
• †Bumelia
  • †Bumelia florissanti
• Bursa
  • †Bursa califomica
• Buteo
  • †Buteo borealis

  • 

    †Buteo jamaicensis
  • †Buteo swainsoni

• Cadulus
  • †Cadulus fusiformis
• Caecum
  • †Caecum californicum
• Calicantharus
  • †Calicantharus dalli
  • †Calicantharus fortis
  • †Calicantharus humerosus
  • †Calicantharus portolaensis – or unidentified comparable form
• †Calicovatellus – type locality for genus
  • †Calicovatellus petrodytes – type locality for species
• Calidris
  • †Calidris alba
• Californiconus
  • †Californiconus californicus
• †Calilampas
  • †Calilampas californiensis
• †Calipepla
  • †Calipepla californica
• Calliostoma
  • †Calliostoma annulata

  • 

    †Calliostoma annulatum
  • †Calliostoma augustinensis
  • †Calliostoma canaliculatum
  • †Calliostoma costatum
  • †Calliostoma crassicostatus
  • †Calliostoma doliarium
  • †Calliostoma doliarum – tentative report
  • †Calliostoma gemmulatum
  • †Calliostoma ligatum
  • †Calliostoma nuttalli
  • †Calliostoma supragranosum
  • †Calliostoma tricolor
• Callista
  • †Callista domenginica
  • †Callista vokesi
• Callistochiton
  • †Callistochiton palmulatus
• Callithaca
  • †Callithaca tenerrima
• Callorhinus
  • †Callorhinus gilmorei – type locality for species

  • 

    †Callorhinus ursinus
• Calopsectra
• †Calorebama
  • †Calorebama inornata
• †Calorhadia – tentative report
• Calosoma
  • †Calosoma semilaeve
• †Calycites
  • †Calycites mikanoides

• 

  Calyptraea
  • †Calyptraea calabasasensis
  • †Calyptraea contorta
  • †Calyptraea costellata
  • †Calyptraea dalliana
  • †Calyptraea diegoana
  • †Calyptraea excentrica
  • †Calyptraea fastigiata
  • †Calyptraea filosa
  • †Calyptraea inornata
  • †Calyptraea mamillaris
  • †Calyptraea mammilaris – or unidentified comparable form
• †Calyptranthes
  • †Calyptranthes myrtifolia – type locality for species

• 

  †Camelops
  • †Camelops hesternus
  • †Camelops minidokae
• †Cammackacetus – Type locality for genus
  • †Cammackacetus hazenorum - Type locality for species^[1]
• Campanile
  • †Campanile dilloni
• Camponotus – type locality for genus
  • †Camponotus festinatus – type locality for species
• †Canarium
  • †Canarium californicum
• Cancellaria
  • †Cancellaria arnoldi
  • †Cancellaria dalliana
  • †Cancellaria fernandoensis
  • †Cancellaria obesa
  • †Cancellaria planospira
  • †Cancellaria posunculensis
  • †Cancellaria subtuberosa
  • †Cancellaria tritonidea
• Cancer
• Cancris
  • †Cancris mexicanus
• Canis

  • 

    †Canis dirus
  • †Canis edwardii
  • †Canis latrans
  • †Canis lepophagus
  • †Canis lupus
  • †Canis rufus
• Canthon
  • †Canthon praticola
  • †Canthon simplex
• †Cantius
  • †Cantius actius
• †Capricamelus – type locality for genus
  • †Capricamelus gettyi – type locality for species
• †Capromeryx

  • 

    †Capromeryx minor
• Caracara
  • †Caracara cheriway
  • †Caracara plancus
• Carcharhinus
• Carcharias
  • †Carcharias clavatus
• †Carcharinus
• Carcharodon
  • †Carcharodon arnoldi
  • †Carcharodon carcharias
  • †Carcharodon hastalis
  • †Carcharodon leviathan
  • †Carcharodon morricei
  • †Carcharodon sulcidens
  • †Carcharodon tembloris – type locality for species
• Cardium
  • †Cardium brewerii, alternative of Acanthocardia brewerii (see List of the Cenozoic life of California § A)
• Carpelimus
• †Carpites
  • †Carpites egregia
• †Carpocyon
  • †Carpocyon robustus

• 

  Carya
  • †Carya bendirei
  • †Carya sessilis
• Caryophyllia
  • †Caryophyllia arnoldi
  • †Caryophyllia californica – type locality for species
  • †Caryophyllia capayensis – type locality for species
  • †Caryophyllia pedroensis – type locality for species
• Cassidulina
  • †Cassidulina crassipunctata
  • †Cassidulina diversa – or unidentified comparable form
  • †Cassidulina globosa
• Castanea
  • †Castanea spokanensis
• Castanopsis
  • †Castanopsis longipetiolatum
• Castor
  • †Castor californicus – or unidentified comparable form
• †Catharista
  • †Catharista shastensis – type locality for species
• Cathartes

  • 

    †Cathartes aura
• Catoptrophorus
  • †Catoptrophorus semipalmatus
• †Catoptrophus
  • †Catoptrophus inornatus
• †Catostomus
  • †Catostomus occidentalis
• Ceanothus
  • †Ceanothus tuolumnensis
  • †Ceanothus turlockensis
• Cedrela
  • †Cedrela eolancifolia – type locality for species
  • †Cedrela trainii
• †Celastrus
  • †Celastrus preangulata – type locality for species
• Celtis
  • †Celtis kansana
• †Centetodon
  • †Centetodon aztecus
  • †Centetodon bembicophagus – or unidentified comparable form
  • †Centetodon magnus – or unidentified comparable form
• Centrifuga
  • †Centrifuga leeana
• Cepphus

  • 

    †Cepphus columba
  • †Cepphus olsoni – type locality for species
• Cercidiphyllum
  • †Cercidiphyllum elongatum
• †Cercocarpus
  • †Cercocarpus nevadensis
• Cerithidea
  • †Cerithidea californica
• Cerithiopsis
  • †Cerithiopsis antefilosa
  • †Cerithiopsis carpenteri
  • †Cerithiopsis columna – or unidentified comparable form
  • †Cerithiopsis cosmia
  • †Cerithiopsis halia – or unidentified related form
  • †Cerithiopsis paramoea
  • †Cerithiopsis pedroana
  • †Cerithiopsis rowelli
  • †Cerithiopsis stejnegeri – or unidentified comparable form
• Cerithium
  • †Cerithium incisum
  • †Cerithium topangensis
• †Cernictis
  • †Cernictis hesperus – type locality for species
• †Cernina
  • †Cernina hannibali
• †Cerorhinca
  • †Cerorhinca dubia – type locality for species
  • †Cerorhinca reai – type locality for species
• Cervus
  • †Cervus elaphus
• Cetorhinus
  • †Cetorhinus maximus

• 

  †Cetotherium
  • †Cetotherium furlongi – type locality for species
• †Chaceia
  • †Chaceia fulcherae – type locality for species
• †Chaenophryne
  • †Chaenophryne melanorhabdus
• Chaetodipus
  • †Chaetodipus formosus – or unidentified comparable form
• †Chaetoptelea
  • †Chaetoptelea pseudofulva
• †Chalcidichthys – type locality for genus
  • †Chalcidichthys malacopterygius – type locality for species
• Chama
  • †Chama arcana
  • †Chama frondosa
  • †Chama grunski
• †Chamaecyparis
  • †Chamaecyparis cordillerae
• Charadrius
  • †Charadrius semipalmatus

• 

  Chauliodus – type locality for genus
  • †Chauliodus eximias
  • †Chauliodus eximius – type locality for species
• †Chedevillia
  • †Chedevillia saltonensis – type locality for species
  • †Chedevillia stewarti – type locality for species
• Chelonia
  • †Chelonia californiensis – type locality for species
• Chen
  • †Chen caerulescens

• 

  †Chendytes – type locality for genus
  • †Chendytes lawi – type locality for species
• Chilostomella
  • †Chilostomella hadleyi
• †Chilostomelloides
  • †Chilostomelloides ovicula
  • †Chilostomelloides oviformis
• Chione
  • †Chione californiensis
  • †Chione cryptolineata – or unidentified comparable form
  • †Chione latilaminosa
  • †Chione lineolata – or unidentified comparable form
  • †Chione panzana
  • †Chione schencki
  • †Chione securis
  • †Chione undatella
• Chionista
  • †Chionista fluctifraga
• Chionopsis
  • †Chionopsis gnidia
  • †Chionopsis richthofeni
  • †Chionopsis temblorensis
• Chlamys
  • †Chlamys bartschi
  • †Chlamys branneri – or unidentified comparable form
  • †Chlamys corteziana – or unidentified comparable form

  • 

    †Chlamys hastata
  • †Chlamys hertleini
  • †Chlamys mediacostatus – type locality for species
  • †Chlamys rubida
  • †Chlamys sespeensis
  • †Chlamys swifti
• Chlorostoma
  • †Chlorostoma gallina
• †Chorizanthe
• †Chrisodomus
• †Chrysobalanus
  • †Chrysobalanus eoicaco

• 

  †Chrysocyon
  • †Chrysocyon nearcticus
• †Chrysodomus – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Chrysodomus martini
• †Chrysolepis
  • †Chrysolepis sonomensis
• †Chumashius
  • †Chumashius balchi – type locality for species
• Cibicides
  • †Cibicides cushmani
  • †Cibicides martinezensis
  • †Cibicides pseudoungerianus
• Cibicidoides
  • †Cibicidoides midwayensis – or unidentified comparable form
• Cicindela
  • †Cicindela haemorrhagica
  • †Cicindela oregona
• Cidaris
  • †Cidaris martinezensis

• 

  Cinnamomum
  • †Cinnamomum acrodromum
  • †Cinnamomum dilleri
• Cissus
  • †Cissus pyriformis
• †Citellus
  • †Citellus bensoni
• Citharichthys
  • †Citharichthys stigmaeus
• †Claibornites
  • †Claibornites diegoensis
  • †Claibornites muirensis
  • †Claibornites turneri

• 

  Clathrodrillia
  • †Clathrodrillia coalingensis
• Clathurella
  • †Clathurella conradiana
• Clavilithes
  • †Clavilithes tabulatus
• Clavus
  • †Clavus hartleyensis – type locality for species
  • †Clavus hemphilli
  • †Clavus pallidus – or unidentified related form
  • †Clavus temblorensis
• Clementia
  • †Clementia brioniana
  • †Clementia conradiana
  • †Clementia pertenius
  • †Clementia pertenuis
• Clethrionomys
• Cletocamptus

• 

  Clinocardium
  • †Clinocardium meekianum
  • †Clinocardium nuttallii
• Cliona
• Clupea
  • †Clupea hadleyi – type locality for species
  • †Clupea tiejei – type locality for species
• Clypeaster
  • †Clypeaster bowersi
  • †Clypeaster carrizoensis – type locality for species
  • †Clypeaster deserti

• 

  Cnemidophorus
• †Coalingodea
  • †Coalingodea tuberculiformis
• Coccodentalium
  • †Coccodentalium emersoni – type locality for species
• †Cocconeis
  • †Cocconeis disculus
  • †Cocconeis placentula
• †Cochlespiropsis – tentative report
  • †Cochlespiropsis jenkinsi – type locality for species
• Cochliomyia – type locality for genus
  • †Cochliomyia macellaria – type locality for species

• 

  Codakia
  • †Codakia colpoica
  • †Codakia distinguenda
• Colaptes
  • †Colaptes cafer
• †Colodon
• Coluber
  • †Coluber constrictor
• Colubraria
• Columba – or unidentified comparable form
  • †Columba fasciata
• Columbarium
• Colymbus
  • †Colymbus nigricollis
  • †Colymbus parvus
  • †Colymbus subparvus – type locality for species
• Compsomyax
  • †Compsomyax subdiaphana

• 

  †Conasprelloides
  • †Conasprelloides planiliratus
• Concavus
  • †Concavus concavus
• †Conchocele
  • †Conchocele bisecta
• Coniontis
  • †Coniontis abdominalis – type locality for species
  • †Coniontis elliptica
  • †Coniontis lamentabilis
  • †Coniontis puncticollis
  • †Coniontis remnans – type locality for species
  • †Coniontis robusta
  • †Coniontis rugosa
• Conus
  • †Conus caleocius
  • †Conus fergusoni
  • †Conus hornii
  • †Conus owenana
  • †Conus owenianus
  • †Conus redmondii – or unidentified comparable form

  • 

    †Conus regularis
  • †Conus remondii
  • †Conus scalaris
• Cooperella
  • †Cooperella subdiaphana
• †Copemys
  • †Copemys barstowensis – type locality for species
  • †Copemys esmeraldensis
  • †Copemys longidens – type locality for species
  • †Copemys pagei
  • †Copemys russelli
  • †Copemys tenuis – type locality for species
• †Cophocara
  • †Cophocara stantoni
• †Cophocetus – tentative report

• 

  Copris
  • †Copris pristinus – type locality for species
• Coragyps
• Coralliophaga
• Corbicula
  • †Corbicula dumblei
• Corbula
  • †Corbula diaboli – type locality for species
  • †Corbula dickersoni
  • †Corbula dilatata
  • †Corbula fragilis
  • †Corbula hornii – or unidentified comparable form
  • †Corbula parilis
  • †Corbula tomulata – or unidentified comparable form

• 

  †Cormohipparion
  • †Cormohipparion occidentale – or unidentified comparable form
• Cornus
  • †Cornus kelloggii
  • †Cornus ovalis – or unidentified comparable form
• †Coronadus – type locality for genus
  • †Coronadus agilis – type locality for species
• Coronula – tentative report
• Corvus
  • †Corvus brachyrhynchos
  • †Corvus corax
• †Cosomys
  • †Cosomys primus – type locality for species
• †Cosoryx
  • †Cosoryx cerroensis – or unidentified comparable form
• Costacallista
  • †Costacallista hornii – or unidentified comparable form

• 

  †Cranioceras
  • †Cranioceras teres
  • †Cranioceras unicornis – or unidentified comparable form
• †Craseops
  • †Craseops sylvestris – type locality for species
• Crassadoma
  • †Crassadoma gigantea
• Crassatella
  • †Crassatella – type locality for species A informal
  • †Crassatella claytonensis
  • †Crassatella compacta
  • †Crassatella granti
  • †Crassatella meganosensis – type locality for species
  • †Crassatella unioides
  • †Crassatella uvasana
  • †Crassatella washingtonensis
• Crassinella
  • †Crassinella nuculiformis
  • †Crassinella pacifica

• 

  Crassispira
  • †Crassispira montereyensis – or unidentified related form
  • †Crassispira zizyphus
• Crassostrea
  • †Crassostrea ashleyi
  • †Crassostrea titan
  • †Crassostrea vaquerosensis
• Crataegus
  • †Crataegus pacifica
• Crawfordina
  • †Crawfordina weaveri
• †Crenaturricula
  • †Crenaturricula crenatospira
• Crepidula
  • †Crepidula adunca
  • †Crepidula coei – or unidentified comparable form
  • †Crepidula diminutiva – type locality for species
  • †Crepidula excavata
  • †Crepidula lessoni
  • †Crepidula nummaria
  • †Crepidula nunimaria

  • 

    †Crepidula onyx
  • †Crepidula pileum – or unidentified comparable form
  • †Crepidula praerupta
  • †Crepidula princeps
  • †Crepidula ungana – or unidentified comparable form
• Crepipatella
  • †Crepipatella lingulata
• †Crommium
  • †Crommium andersoni
  • †Crommium pinyonensis
• Crossata
  • †Crossata ventricosa
• Crotalus

  • 

    †Crotalus viridis
• Crucibulum
  • †Crucibulum spinosum
• †Crypholestes
  • †Crypholestes vaughni
• †Cryptocarya
  • †Cryptocarya praesamarensis
• †Cryptoconus
  • †Cryptoconus cooperi
• Cryptomya
  • †Cryptomya californica
• Cryptonatica
  • †Cryptonatica affinis
  • †Cryptonatica aleutica

• 

  Cryptotermes
  • †Cryptotermes ryshkoffi – type locality for species
• Cryptotis
• Ctenocardia
  • †Ctenocardia biangulata
• Cucullaea
  • †Cucullaea mathewsoni
  • †Cucullaea mathewsonii
• Culicoides
  • †Culicoides carri – type locality for species
  • †Culicoides fossilis – type locality for species
  • †Culicoides laurae – type locality for species
  • †Culicoides megacanthus – type locality for species
  • †Culicoides mioceneus – type locality for species
• Cumingia
  • †Cumingia lamellosa
• †Cunnolites – tentative report
• †Cupania
  • †Cupania oregona
• †Cupidinimus
  • †Cupidinimus avawatzensis
  • †Cupidinimus bidahochiensis – or unidentified comparable form
  • †Cupidinimus boronensis – type locality for species
  • †Cupidinimus halli
  • †Cupidinimus lindsayi – type locality for species
  • †Cupidinimus tertius

• 

  †Cupressus
  • †Cupressus goveniana
  • †Cupressus mokelumnensis
• Cuspidaria
  • †Cuspidaria hannibali
• †Cuyamacamelus
  • †Cuyamacamelus jamesi
• †Cuyamalagus
  • †Cuyamalagus dawsoni – type locality for species
• Cyanocitta
  • †Cyanocitta stelleri
• Cybocephalus
  • †Cybocephalus californicus – or unidentified comparable form
• Cyclammina
  • †Cyclammina clarki
  • †Cyclammina incisa – or unidentified comparable form
• Cyclinella
• Cyclocardia
  • †Cyclocardia californica
  • †Cyclocardia montereyana – type locality for species
  • †Cyclocardia ventricosa
• †Cyclocorystes
  • †Cyclocorystes aldersoni – type locality for species
• †Cyclosthone – or unidentified comparable form

• 

  Cyclothone
• Cygnus
  • †Cygnus columbianus
• Cylichna
  • †Cylichna attonsa
• Cylichnella
  • †Cylichnella attonsa
  • †Cylichnella culcitella
• Cymatium
  • †Cymatium elsemerense
  • †Cymatium janetae – type locality for species
• Cymatogaster
  • †Cymatogaster aggregata
• †Cymbophora
• †Cynarctoides
  • †Cynarctoides acridens
  • †Cynarctoides whistleri – type locality for species
• †Cynarctus
  • †Cynarctus galushai – type locality for species

• 

  †Cynelos
  • †Cynelos malasi – type locality for species
  • †Cynelos sinapius – or unidentified comparable form
• †Cynorca
  • †Cynorca occidentale
• Cynoscion
  • †Cynoscion eprepes
• Cyperus
• Cypraea
• Cyrena
  • †Cyrena dumblei
  • †Cyrena studleyi – or unidentified comparable form

• 

  Cyrtonyx
  • †Cyrtonyx tedfordi – type locality for species
• Cystiscus
  • †Cystiscus subtrigona
• Cythara
  • †Cythara cetolaca
  • †Cythara hecetae
  • †Cythara interlirata
• Cytherea
  • †Cytherea mathewsoni

• †Dalbergia
  • †Dalbergia rubra – type locality for species
• Dallocardia
  • †Dallocardia quadragenarium
• Damalichthys
  • †Damalichthys vacca
• †Daphoenodon – or unidentified comparable form

• 

  †Daphoenus
  • †Daphoenus ruber – type locality for species
• †Darbyella
• Dardanus
  • †Dardanus arrosor
• †Dasceles – type locality for genus
  • †Dasceles dassurus – type locality for species
• Dasyatis
  • †Dasyatis dipterus
• Dasyhelea
  • †Dasyhelea antiqua
  • †Dasyhelea browneae – type locality for species
  • †Dasyhelea dara – type locality for species
  • †Dasyhelea judithae – type locality for species
  • †Dasyhelea kanakoffi – type locality for species
  • †Dasyhelea stenoceras – type locality for species

• 

  †Decapterus
  • †Decapterus hopkinsi
• Delectopecten
  • †Delectopecten lillisi
  • †Delectopecten peckhami
• †Delphinavus – type locality for genus
  • †Delphinavus newhalli – type locality for species
• Deltochilum – tentative report
• Deltocyathus
  • †Deltocyathus whitei – type locality for species
• Dendostrea
  • †Dendostrea vespertina
• Dendragapus
  • †Dendragapus fuliginosus

  • 

    †Dendragapus obscurus
• Dendraster
  • †Dendraster coalingaensis – or unidentified comparable form
  • †Dendraster excentricus
  • †Dendraster gibbsi
• Dendrophyllia
  • †Dendrophyllia californiana – type locality for species
  • †Dendrophyllia oldroydi – tentative report
  • †Dendrophyllia tejonensis – type locality for species

• 

  Dendryphantes
• Dentalina
  • †Dentalina approximata
  • †Dentalina consobrina
  • †Dentalina cooperensis
  • †Dentalina jarvisi
  • †Dentalina legumen – or unidentified comparable form
  • †Dentalina nasuta
  • †Dentalina pauperata
  • †Dentalina quadrulata
  • †Dentalina spinosa
• Dentalium
  • †Dentalium conradi
  • †Dentalium cooperi
  • †Dentalium laneensis
  • †Dentalium mcganna – type locality for species^[2]
  • †Dentalium neohexagonum
  • †Dentalium radiolineata – or unidentified comparable form
  • †Dentalium rectius
  • †Dentalium stentor
  • †Dentalium stramineum

• 

  Dermochelys – or unidentified related form
• Deroceras
• †Derrhias – type locality for genus
  • †Derrhias enantius – type locality for species
• †Desmathyus – or unidentified related form
• †Desmatippus
  • †Desmatippus avus
• †Desmatochoerus
  • †Desmatochoerus hesperus
• †Desmocyon
  • †Desmocyon thomsoni
• †Desmodium
  • †Desmodium indentum – type locality for species

• 

  †Desmostylus
  • †Desmostylus hesperus – type locality for species
• Diacria
  • †Diacria trispinosa
• Diaphana
  • †Diaphana brunnea
• †Diceratherium
• Dichocoenia
  • †Dichocoenia merriami
• †Dinohippus
  • †Dinohippus interpolatus
  • †Dinohippus leardi
  • †Dinohippus leidyanus
  • †Dinohippus mexicanus
• †Dinohyus
  • †Dinohyus hollandi
• Diodora
  • †Diodora arnoldi
  • †Diodora aspera
  • †Diodora inaequalis
• †Diomeda
• Diomedea
  • †Diomedea milleri – type locality for species
• †Diomedia
  • †Diomedia albatrus
  • †Diomedia nigripes
• †Dioplotherium
  • †Dioplotherium allisoni

• 

  †Diospyros
  • †Diospyros oregoniana
  • †Diospyros retinervis
• Diplodonta
  • †Diplodonta buwaldana
  • †Diplodonta cretacea
  • †Diplodonta orbella
  • †Diplodonta pariiis
  • †Diplodonta parilis
  • †Diplodonta sericata
• Diploria
  • †Diploria bowersi – type locality for species
• Dipodomys
  • †Dipodomys agilis – or unidentified comparable form
  • †Dipodomys compactus
  • †Dipodomys deserti – or unidentified comparable form
  • †Dipodomys heermanni – or unidentified comparable form
  • †Dipodomys hibbardi

  • 

    †Dipodomys merriami
  • †Dipodomys minor
  • †Dipodomys ordii
• †Dipoides
  • †Dipoides vallicula
• †Diprionomys
  • †Diprionomys parvus – or unidentified comparable form
• Discammina – tentative report
  • †Discammina eocenica
• Discinisca
  • †Discinisca cumingi

• 

  †Discohelix
  • †Discohelix californicus
• †Dissacus
• Distorsio
• Divalinga
  • †Divalinga eburnea
• Divaricella
  • †Divaricella cumulata
• †Domnina
• †Domninoides
• Donax
  • †Donax californicus
  • †Donax gouldii
• †Dorothia
  • †Dorothia californica
• Dosinia
  • †Dosinia conradi
  • †Dosinia dunkeri
  • †Dosinia jacalitosana
  • †Dosinia margaritana
  • †Dosinia mathewsoni
  • †Dosinia mathewsonii
  • †Dosinia merriami
  • †Dosinia milthoidea – tentative report
  • †Dosinia ponderosa
  • †Dosinia santana – type locality for species
  • †Dosinia semiobliterata – or unidentified comparable form
  • †Dosinia whitneyi
• †Dosiniopsis
  • †Dosiniopsis stewartvillensis – type locality for species
• †Drimys – type locality for genus
  • †Drimys defensor – type locality for species
• †Dromomeryx
• †Duchesneodus
  • †Duchesneodus uintensis
• †Dusignathus – type locality for genus
  • †Dusignathus santacruzensis – type locality for species
  • †Dusignathus seftoni – type locality for species

• 

  †Dusisiren
  • †Dusisiren dewana
  • †Dusisiren jordani – type locality for species
• †Dyseohyus – type locality for genus
  • †Dyseohyus fricki – type locality for species
• †Dyseolemur
  • †Dyseolemur pacificus – type locality for species
• Dytiscus
  • †Dytiscus marginicollis

• Echinarachnius
  • †Echinarachnius fairbanksi

• 

  Echinorhinus
  • †Echinorhinus blakei
• Eclipes – type locality for genus
  • †Eclipes extensus
  • †Eclipes manni
  • †Eclipes santamonicae – type locality for species
  • †Eclipes veternus – type locality for species
• †Ectasis – type locality for genus
  • †Ectasis proriger – type locality for species
• †Ectinochilus
  • †Ectinochilus macilentus
• †Ectopistes

  • 

    †Ectopistes migratorius
• Eleodes
  • †Eleodes acuticaudus
  • †Eleodes giganteus
  • †Eleodes gracilis
  • †Eleodes grandicollis – type locality for species
  • †Eleodes laticollis
  • †Eleodes omissus
  • †Eleodes osculans – type locality for species
• Elgaria
  • †Elgaria multicarinata
• †Ellimma
  • †Ellimma barbarae – type locality for species
  • †Ellimma elmodenae – type locality for species
• †Ellipsonodosaria
  • †Ellipsonodosaria alexanderi – or unidentified comparable form
  • †Ellipsonodosaria atlantisae
  • †Ellipsonodosaria recta
  • †Ellipsonodosaria spinulosa
• Elliptotellina
  • †Elliptotellina townsendensis – or unidentified comparable form

• 

  †Elomeryx
  • †Elomeryx armatus
• †Emmachaere – type locality for genus
  • †Emmachaere rhachites – type locality for species
  • †Emmachaere rhomalea
• †Enaliarctos
  • †Enaliarctos mealsi
  • †Enaliarctos mitchelli
• †Enallagma – type locality for genus
  • †Enallagma kirkbyae – type locality for species
• Encope
  • †Encope tenuis – type locality for species
• Engelhardtia
  • †Engelhardtia nevadensis
• Engina
  • †Engina strongi
• †Engraulites – type locality for genus
  • †Engraulites remifer – type locality for species
• Enhydra

  • 

    †Enhydra lutris
  • †Enhydra macrodonta – type locality for species
• †Enhydritherium
  • †Enhydritherium terraenovae
• Ensis
  • †Ensis myrae
• Entomobrya
  • †Entomobrya atrocincta
  • †Entomobrya kirkbyae – type locality for species
• †Eocernia
  • †Eocernia hannibali
• †Eocypraea
  • †Eocypraea castacensis – or unidentified comparable form
  • †Eocypraea maniobraensis – type locality for species
• †Eogryphus
  • †Eogryphus tolmani – or unidentified comparable form
• †Eohaplomys
  • †Eohaplomys matutinus – type locality for species
  • †Eohaplomys serus – type locality for species
  • †Eohaplomys tradux – type locality for species
• †Eomellivora
  • †Eomellivora wimani – or unidentified comparable form

• 

  †Eopelobates
• †Eopleurotoma
  • †Eopleurotoma whitakerpeakensis – type locality for species
• †Eoscorpius – type locality for genus
  • †Eoscorpius primaevus – type locality for species
• †Eosurcula
  • †Eosurcula inconstans – or unidentified related form
• †Eotaria – type locality for genus
  • †Eotaria citrica – type locality for species
  • †Eotaria crypta – type locality for species
• †Eotibia
  • †Eotibia llajasensis – type locality for species
• †Eotylopus
• †Epelichthys – type locality for genus
  • †Epelichthys michaelis – type locality for species

• 

  †Epicyon
  • †Epicyon haydeni
  • †Epicyon saevus
• †Epihippus
• Epilucina
  • †Epilucina californica
• Epinephelus
• †Epiphragmophora
  • †Epiphragmophora mormonum
• †Epistomina
  • †Epistomina eocenica

• 

  Epitonium
  • †Epitonium bellastriata
  • †Epitonium bellastriatum
  • †Epitonium clarki
  • †Epitonium condoni
  • †Epitonium cookii – or unidentified related form
  • †Epitonium cooperi
  • †Epitonium indianorum
  • †Epitonium insculptum
  • †Epitonium rugiferum – or unidentified comparable form
  • †Epitonium sawinae
• Eponides
  • †Eponides keenani
  • †Eponides kleinpelli
  • †Eponides lodoensis
  • †Eponides umbonatus
• Eptesicus
  • †Eptesicus fuscus – or unidentified comparable form
• †Equisetum
• Equus
  • †Equus conversidens
  • †Equus enormis
  • †Equus idahoensis
  • †Equus pacificus
  • †Equus scotti

  • 

    †Equus simplicidens
• Eremophila
  • †Eremophila alpestris
• Erethizon
  • †Erethizon bathygnathum
  • †Erethizon cascoensis – type locality for species
  • †Erethizon dorsatum
• †Eriquius
  • †Eriquius plectrodes
• †Erisceles – type locality for genus
  • †Erisceles pristinus – type locality for species
• †Eritima
  • †Eritima evides – type locality for species
• †Escharion – type locality for genus
  • †Escharion townleyi – type locality for species
• Eschrichtius
  • †Eschrichtius robustus – or unidentified comparable form
• †Etringus
  • †Etringus scintillans
• Eubalaena – or unidentified comparable form
• †Eucastor

• 

  †Euceratherium – type locality for genus
  • †Euceratherium collinum – type locality for species
• Eucrassatella
  • †Eucrassatella semidentata
  • †Eucrassatella subgibbosus – type locality for species
• †Eucyon
  • †Eucyon davisi
• Euleptorhamphus
  • †Euleptorhamphus peronides
• Eumetopias
  • †Eumetopias jubata
• †Euoplocyon
  • †Euoplocyon brachygnathus
• Eupatagus
  • †Eupatagus stevensi
• Euphagus
  • †Euphagus cyanocephalus
• Eurytellina
  • †Eurytellina lorenzoensis
• Euscelis
  • †Euscelis palmeri – type locality for species

• 

  Eusmilia
  • †Eusmilia carrizensis – type locality for species
• Euspira
  • †Euspira gesteri
  • †Euspira hornii
  • †Euspira lewisii
  • †Euspira muriciformis
  • †Euspira nuciformis
• †Euspirocromium
  • †Euspirocromium martinezensis
• †Euspirocrommium
  • †Euspirocrommium martinezensis

• 

  Eutamias
• †Eutrephoceras
  • †Eutrephoceras hallidayi
  • †Eutrephoceras hannai
  • †Eutrephoceras marksi
  • †Eutrephoceras stephensoni – type locality for species
• Euvola
  • †Euvola keepi
  • †Euvola vogdesi
• †Evesthes
  • †Evesthes jordani
• †Exaeretoptera – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Exaeretoptera fosteri – type locality for species
• †Exilia
  • †Exilia fausta
  • †Exilia talliaferroi – or unidentified comparable form

• Falco
  • †Falco peregrinus

  • 

    †Falco sparverius
• Falsifusus
• Farrea
  • †Farrea rugosa – type locality for species
• Fartulum
  • †Fartulum hemphilli
  • †Fartulum occidentale
• Felaniella
  • †Felaniella harfordi
• Felis
  • †Felis lacustris
  • †Felis rexroadensis
• †Ficopsis
  • †Ficopsis cooperiana
  • †Ficopsis crescentensis
  • †Ficopsis horni
  • †Ficopsis meganosensis – type locality for species
  • †Ficopsis redmondii
  • †Ficopsis remondi
  • †Ficopsis remondii

• 

  Ficus
  • †Ficus decussata
  • †Ficus densifolia
  • †Ficus gesteri
  • †Ficus goshenensis
  • †Ficus modesta – or unidentified comparable form
  • †Ficus nodiferum
  • †Ficus ocoyana
  • †Ficus pyriformis
• Fimbria
  • †Fimbria pacifica
  • †Fimbria susanensis – type locality for species
• Fissurella
  • †Fissurella behri – or unidentified related form
  • †Fissurella volcano

• 

  Flabellipecten
  • †Flabellipecten carrizoensis
  • †Flabellipecten stearnsii
• Flabellum
  • †Flabellum californicum
  • †Flabellum clarki – type locality for species
  • †Flabellum cuneiforme
  • †Flabellum stantoni
• †Forestiera
  • †Forestiera buchananensis
• †Forfex – type locality for genus
  • †Forfex hypuralis – type locality for species
• Forreria
  • †Forreria belchei
  • †Forreria belcheri
  • †Forreria carisaensis
  • †Forreria coalingensis
• †Fragilaria
  • †Fragilaria brevistriata
  • †Fragilaria construens
  • †Fragilaria pinnata
• Fratercula

  • 

    †Fratercula cirrhata
  • †Fratercula dowi – type locality for species
• †Fraxinus
  • †Fraxinus yubaensis – type locality for species
• Frondicularia
  • †Frondicularia tenuissima
• Fulgoraria
  • †Fulgoraria prevostiana
  • †Fulgoraria zinsmeisteri – type locality for species
• †Fulica
  • †Fulica americana
• Fulmarus
  • †Fulmarus glacialis
  • †Fulmarus griseus
  • †Fulmarus hammeri – type locality for species
  • †Fulmarus miocaenus – type locality for species
• Fusimitra – tentative report
  • †Fusimitra simplicissima – or unidentified comparable form
• Fusinus
  • †Fusinus barbarensis
  • †Fusinus calabasensis
  • †Fusinus chehalisensis – or unidentified comparable form
  • †Fusinus hecoxi
  • †Fusinus lincolnensis – or unidentified related form
  • †Fusinus luteopictus
  • †Fusinus meganosensis – type locality for species
  • †Fusinus merriami – or unidentified related form
  • †Fusinus simiensis

• 

  Galeocerdo
  • †Galeocerdo aduncus
  • †Galeocerdo medius
• Galeodea
  • †Galeodea calfornica
  • †Galeodea carinata – or unidentified related form
  • †Galeodea meganosensis
  • †Galeodea petersoni – or unidentified related form
  • †Galeodea susanae
  • †Galeodea sutterensis

• 

  Galeorhinus
  • †Galeorhinus hannibali
  • †Galeorhinus latus – or unidentified comparable form
  • †Galeorhinus zopterus
• †Ganolytes
  • †Ganolytes aratus
  • †Ganolytes cameo
  • †Ganolytes clepsydra – type locality for species
• Gari
  • †Gari californica
  • †Gari diegoensis – or unidentified comparable form
  • †Gari furcata
  • †Gari hornii
  • †Gari texta
• †Gasterosternus
  • †Gasterosternus aculeatus
• Gasterosteus

  • 

    †Gasterosteus aculeatus
• Gastrochaena
  • †Gastrochaena dubitata – tentative report
• Gaudryina
  • †Gaudryina laevigata
  • †Gaudryina triangularis – or unidentified comparable form
• Gavia
  • †Gavia arctica
  • †Gavia brodkorbi – type locality for species
  • †Gavia concinna
  • †Gavia howardae – type locality for species
  • †Gavia immer
  • †Gavia pacifica

  • 

    †Gavia stellata
• †Gemelliporella – tentative report
  • †Gemelliporella punctata – or unidentified related form
• Gemmula
  • †Gemmula diabloensis – type locality for species
  • †Gemmula wattsi
• Genota
  • †Genota keepi
• Genyonemus
  • †Genyonemus lineatus
• Geochelone
• †Geococcyx

  • 

    †Geococcyx californianus
• Geomys
• Geranoaetus
• Gerrhonotus
• Gibbolucina
  • †Gibbolucina gyrata
  • †Gibbolucina turneri
• †Gila – tentative report
• †Gilbertia
• †Gisortia
  • †Gisortia clarki
• Glans
  • †Glans carpenteri
• Glaucidium

  • 

    †Glaucidium gnoma
• Glebocarcinus
  • †Glebocarcinus amphioetus
• Globigerina
  • †Globigerina bulloides
  • †Globigerina decepta
  • †Globigerina ouachitaensis
  • †Globigerina triloculinoides
• Globorotalia
  • †Globorotalia crassata
• Globularia
  • †Globularia hannabali – or unidentified comparable form
• Glossus
  • †Glossus susukii – type locality for species
• Glycimeris

• 

  Glycymeris
  • †Glycymeris branneri
  • †Glycymeris gigantea
  • †Glycymeris major
  • †Glycymeris perrini
  • †Glycymeris rosecanyonensis
  • †Glycymeris sagittata
  • †Glycymeris septentrionalis
  • †Glycymeris veatchi
  • †Glycymeris veatchii
• Glyptoactis
  • †Glyptoactis domenginica
  • †Glyptoactis keenae
  • †Glyptoactis mcmasteri
  • †Glyptoactis sandiegoensis
• Glyptostrobus
  • †Glyptostrobus oregonensis
• †Gnathamitermes
  • †Gnathamitermes rousei – type locality for species
• Gnathotermes
• †Golerdelphys – type locality for genus
  • †Golerdelphys stocki – type locality for species
• †Goleremys – type locality for genus
  • †Goleremys mckennai – type locality for species
• †Gomphotaria – type locality for genus
  • †Gomphotaria pugnax – type locality for species

• 

  †Gomphotherium
  • †Gomphotherium obscurum
• †Goniobasis – tentative report
• Goniopora
  • †Goniopora vaughani – type locality for species
• Gopherus
  • †Gopherus agassizi
  • †Gopherus agassizii
  • †Gopherus mohavetus – type locality for species
• †Gordonia
  • †Gordonia egregia
• Granulina
  • †Granulina margaritula
• †Gripholagomys – tentative report
• †Griphomys
  • †Griphomys alecer – type locality for species
  • †Griphomys toltecus – type locality for species
• Gymnogyps

  • 

    †Gymnogyps californianus – type locality for species
• Gyroidina
  • †Gyroidina condoni
  • †Gyroidina orbicularis
  • †Gyroidina planulata
  • †Gyroidina soldanii

• †Hadrogyps – type locality for genus
  • †Hadrogyps aigialeus – type locality for species
• Haliaeetus
  • †Haliaeetus leucocephalus
• †Haliaetus
  • †Haliaetus leucocephalus
• †Halonanus
  • †Halonanus horni
• †Hamamelites
  • †Hamamelites voyana

• 

  Haminoea
  • †Haminoea postangulata – type locality for species
  • †Haminoea vesicula
• Hanetia
  • †Hanetia elegans
• †Hantkenina
  • †Hantkenina alabamensis
• Haplophragmoides
  • †Haplophragmoides flagleri
  • †Haplophragmoides obliquicameratus

• 

  †Harpagolestes – or unidentified comparable form
• †Harrymys
  • †Harrymys magnus
• Harvella
  • †Harvella elegans
• †Hastigerinella
  • †Hastigerinella eocenica
• †Hayia – type locality for genus
  • †Hayia daulica – type locality for species
• †Heliscomys
  • †Heliscomys walshi – type locality for species
• Heloderma
• †Hemiacodon
  • †Hemiacodon gracilis

• 

  †Hemiauchenia
  • †Hemiauchenia macrocephala
• Hemipristis
  • †Hemipristis heteropleurus
  • †Hemipristis serra
• Hemitelia
  • †Hemitelia pinnata – type locality for species
• Hemitoma
  • †Hemitoma cantonensis – type locality for species
• †Hercoglossa
  • †Hercoglossa merriami – type locality for species
  • †Hercoglossa simiensis – type locality for species
• Here
  • †Here excavata
• †Herpetocetus
  • †Herpetocetus bramblei – type locality for species
  • †Herpetocetus morrowi – type locality for species

• 

  †Herpetotherium
  • †Herpetotherium innominatum – or unidentified comparable form
  • †Herpetotherium knighti – or unidentified comparable form
  • †Herpetotherium valens
• †Hesperaletes
  • †Hesperaletes borineyi – type locality for species
  • †Hesperaletes walshi – type locality for species
• Hespererato
  • †Hespererato columbella
• †Hesperhys
  • †Hesperhys vagrans
• †Hesperocamelus – or unidentified comparable form
• †Hesperocetus – type locality for genus
  • †Hesperocetus californicus – type locality for species
• †Hesperolagomys
• Hesperomys
  • †Hesperomys nematodon
• †Hesperotestudo
  • †Hesperotestudo orthopygia

• 

  Heterodontus
  • †Heterodontus francisi – or unidentified comparable form
• †Heteropliohippus
  • †Heteropliohippus hulberti – type locality for species
• Heterosilpha
  • †Heterosilpha ramosa
• Heteroterma
  • †Heteroterma striata
  • †Heteroterma trochoidea
• †Hexacanthus
• Hexagrammos
  • †Hexagrammos achrestus – type locality for species

• 

  Hexanchus
  • †Hexanchus aus
  • †Hexanchus bus
• Hiatella
  • †Hiatella arctica
• †Hilgardia – tentative report
  • †Hilgardia parkei
• †Hiltonius
  • †Hiltonius australis – type locality for species

• 

  †Hipparion
  • †Hipparion forcei
  • †Hipparion tehonense
• †Hippidion
• †Hippipeda
• †Hippnoe
  • †Hippnoe californica
• Hipponix
  • †Hipponix craniodes
  • †Hipponix tumens
• †Hipponoe
  • †Hipponoe californica
• †Hippotherium
• Histrionicus
  • †Histrionicus histrionicus – tentative report
• Hodomys
• Homalopoma
  • †Homalopoma carpenteri
  • †Homalopoma domenginensis
  • †Homalopoma pacifica
  • †Homalopoma wattsi
• Homo
  • †Homo sapiens
• †Homomya

• 

  †Homotherium
  • †Homotherium serum – or unidentified comparable form
• †Hopkinsina
  • †Hopkinsina compressa
• †Hoplictis
  • †Hoplictis grangerensis – or unidentified comparable form
• †Hoplophoneus
  • †Hoplophoneus cerebralis
• †Humilaria
  • †Humilaria perlaminosa

• 

  †Hyaenodon
  • †Hyaenodon venturae
  • †Hyaenodon vetus – type locality for species
• Hyalina
  • †Hyalina californica
• †Hyalinonetrion
  • †Hyalinonetrion clavatum
• Hydrangea
  • †Hydrangea californica – type locality for species
• †Hydrodamalis
  • †Hydrodamalis cuestae – type locality for species

  • 

    †Hydrodamalis gigas
• Hydrophilus
• Hyla
• †Hyopsodus – or unidentified comparable form
• †Hyperbaena
  • †Hyperbaena diforma
• †Hypertragulus
  • †Hypertragulus calcaratus
  • †Hypertragulus hesperius
• †Hypohippus
• †Hypolagus
  • †Hypolagus edensis – type locality for species
  • †Hypolagus fontinalis
  • †Hypolagus furlongi
  • †Hypolagus gidleyi
  • †Hypolagus parviplicatus – or unidentified comparable form
  • †Hypolagus tedfordi
  • †Hypolagus vetus
• †Hyrachyus

• †Ibarus
  • †Ibarus ignotus – or unidentified comparable form
• †Idiophyseter – type locality for genus
  • †Idiophyseter merriami – type locality for species
• †Ignacius
  • †Ignacius frugivorus
• †Ilingoceros

• 

  †Imagotaria – type locality for genus
  • †Imagotaria downsi – type locality for species
• †Indarctos
• †Inga
  • †Inga ionensis – type locality for species
• †Interchlamys
  • †Interchlamys interlineata – or unidentified comparable form
• †Ioscion
  • †Ioscion morgani
• Ischnochiton
  • †Ischnochiton sanctaemonicae
• †Ischyrocyon
  • †Ischyrocyon gidleyi

• 

  †Ischyromys
• Iselica
  • †Iselica fenestrata
• Isognomon
  • †Isognomon clarki
• Isurus
  • †Isurus aus
  • †Isurus benedini
  • †Isurus bus
  • †Isurus oxyrhynchus
  • †Isurus oxyrinchus
  • †Isurus planus

• †Jacobsomys
  • †Jacobsomys dailyi – type locality for species
• †Jamilcotatus
  • †Jamilcotatus boreios – type locality for species
• Jaton
  • †Jaton eldridgei
  • †Jaton festivus
• †Johannsenomyia
  • †Johannsenomyia hotchkissae – type locality for species
• Jouannetia
• Juliacorbula
  • †Juliacorbula luteola
• †Julus
  • †Julus cavicola – type locality for species
  • †Julus occidentalis – type locality for species
• †Jumaraina
  • †Jumaraina rinconensis – type locality for species
• †Juncus

• 

  Juniperus

• Kalolophus
  • †Kalolophus antillarum – or unidentified comparable form
• †Kampholophos – type locality for genus
  • †Kampholophos serrulus – type locality for species
• Karreriella
  • †Karreriella barbati
  • †Karreriella mediaaquaensis
• Katherinella
• Kelletia
  • †Kelletia kelletii
• Kellia
  • †Kellia suborbicularis

• 

  †Kentriodon – type locality for genus
  • †Kentriodon obscurus – type locality for species
• †Keteleeria
  • †Keteleeria heterophylloides
• †Kewia – tentative report
  • †Kewia fairbanksi – or unidentified comparable form
• †Kingena
  • †Kingena simiensis
• †Kirkomys – or unidentified comparable form
• †Knightomys – or unidentified comparable form
• †Kummelonautilus
• Kurtiella
  • †Kurtiella tumida
• Kurtzia
  • †Kurtzia arteaga
• Kurtziella
  • †Kurtziella plumbea

• 

  †Labyrinthus
  • †Labyrinthus obtusus – type locality for species
• Lacuna
  • †Lacuna carinata
  • †Lacuna porrecta
  • †Lacuna solidula
  • †Lacuna unifasciata
• †Lacunaria
  • †Lacunaria striata – or unidentified related form
• Laevicardium

  • 

    †Laevicardium elatum
  • †Laevicardium substriatum
• Lagena
  • †Lagena isabella
  • †Lagena strumosa
  • †Lagena substriata
  • †Lagena sulcata
  • †Lagena vulgaris
• Lamelliconcha
  • †Lamelliconcha clarki
• Lamna
• Lampanyctus
• †Lampris – type locality for genus

  • 

    †Lampris zatima – type locality for species
• †Lamprolithax – type locality for genus
  • †Lamprolithax annectens – type locality for species
  • †Lamprolithax simulans – type locality for species
• Lampropeltis
  • †Lampropeltis getulus
• †Lantanotherium
  • †Lantanotherium dehmi
  • †Lantanotherium sawini
• †Lapparia
  • †Lapparia eomagna
• Larus

  • 

    †Larus californicus
  • †Larus delawarensis
  • †Larus glaucescens
  • †Larus philadelphia
• Latirus
  • †Latirus buwaldana
  • †Latirus nightingalei – or unidentified comparable form
  • †Latirus roseburgensis – or unidentified comparable form
• †Laurophyllum
  • †Laurophyllum fremontensis
  • †Laurophyllum litseaefolia
• †Laytonia – type locality for genus
  • †Laytonia californica – type locality for species
• Lechytia
• Leda
  • †Leda gabbi
• †Legionarictis – type locality for genus
  • †Legionarictis fortidens – type locality for species
• †Leidymys
• †Lembicus – type locality for genus
  • †Lembicus meiklejohni – type locality for species
• Lenticulina
  • †Lenticulina convergens
• Lepeta
  • †Lepeta concentrica

• 

  Lepidochitona
  • †Lepidochitona keepiana
• †Lepidogobias
  • †Lepidogobias lepidus
• Lepidozona
  • †Lepidozona pectinulatus
• Lepisosteus
  • †Lepisosteus spatula – or unidentified comparable form
• †Leptacanthichthys
  • †Leptacanthichthys gracilispinis
• †Leptarctus
  • †Leptarctus ancipidens
  • †Leptarctus wortmani

• 

  †Leptocyon
  • †Leptocyon leidyi
  • †Leptocyon tejonensis – type locality for species
  • †Leptocyon vafer
  • †Leptocyon vulpinus
• †Leptodontomys
  • †Leptodontomys stirtoni
• †Leptomeryx
  • †Leptomeryx blacki
• Leptopecten
  • †Leptopecten andersoni

  • 

    †Leptopecten latiauratus
• †Leptoreodon
  • †Leptoreodon edwardsi – type locality for species
  • †Leptoreodon golzi – type locality for species
  • †Leptoreodon leptolophus – type locality for species
  • †Leptoreodon major – type locality for species
  • †Leptoreodon marshi – or unidentified comparable form
  • †Leptoreodon pusillus – type locality for species
  • †Leptoreodon stocki – type locality for species
• †Leptotomus
  • †Leptotomus caryophilus
• Lepus
  • †Lepus americanus
  • †Lepus californicus
  • †Lepus callotis
• Leukoma
  • †Leukoma staminea
• Lima
• Limaria
  • †Limaria hemphilli

• 

  †Limnocyon
• †Limnoecus
  • †Limnoecus tricuspis – type locality for species
• †Limosa
  • †Limosa fedoa
  • †Limosa vanrossemi – type locality for species
• Linga
• †Linophryne
  • †Linophryne indica
• †Liolithax – type locality for genus
  • †Liolithax kernensis – type locality for species
• Liquidambar
  • †Liquidambar californicum
• Lirobittium – tentative report
• †Lirosceles
  • †Lirosceles elegans – type locality for species
• Lirularia
  • †Lirularia funiculata
  • †Lirularia lirulata
• Lissodelphis – or unidentified comparable form
• †Lithocarpus
  • †Lithocarpus klamathensis
  • †Lithocarpus nevadensis
• Lithophaga
  • †Lithophaga plumula
• Lithophyllum
  • †Lithophyllum sierraeblancae – type locality for species

• 

  †Lithornis – or unidentified comparable form
• Lithothamnion
  • †Lithothamnion grahami
  • †Lithothamnion laminosum – type locality for species
  • †Lithothamnion luxurum
  • †Lithothamnion manni
  • †Lithothamnion meganosium
  • †Lithothamnion validum – or unidentified related form
  • †Lithothamnion wallisium
• †Litorhadia
  • †Litorhadia washingtonensis – or unidentified comparable form
• Littorina
  • †Littorina petricola
  • †Littorina planaxis
  • †Littorina scutulata
• †Lituyapecten
  • †Lituyapecten purisimaensis

• 

  †Lompoquia – type locality for genus
  • †Lompoquia retropes – type locality for species
• †Lonchodelphis
  • †Lonchodelphis occiduus – type locality for species
• Lontra
  • †Lontra canadensis
• †Lophar – type locality for genus
  • †Lophar miocaenus – type locality for species
• †Lophocetus
  • †Lophocetus repenningi – type locality for species
• †Lophortyx
  • †Lophortyx californica
• †Lora
• †Losinia
• Lottia
  • †Lottia limatula

  • 

    †Lottia scabra
• †Loxolithax – type locality for genus
  • †Loxolithax sinuosa – type locality for species
• †Loxotrema
  • †Loxotrema turritum
• Lucapinella
  • †Lucapinella callomarginata
• Lucina
  • †Lucina gaylordi
  • †Lucina wattsi
• Lucinisca
  • †Lucinisca nuttalli
• Lucinoma
  • †Lucinoma acutilineata
  • †Lucinoma annulatum
• Luidia
  • †Luidia etchegoinensis – type locality for species
  • †Luidia sanjoaquinensis – type locality for species
• †Lutianus
  • †Lutianus hagari – type locality for species

• 

  †Lycophocyon – type locality for genus
  • †Lycophocyon hutchisoni – type locality for species
• †Lygisma – type locality for genus
  • †Lygisma tenax – type locality for species
• Lygodium
  • †Lygodium kaulfussi
• Lynx
  • †Lynx fasciatus
  • †Lynx rufus
• Lyonsia
  • †Lyonsia califomica
  • †Lyonsia venturaensis – type locality for species
• Lyria
  • †Lyria andersoni
• †Lyrischapa
  • †Lyrischapa lajollaensis
• †Lyropecten
  • †Lyropecten bowersi
  • †Lyropecten crassicardo
  • †Lyropecten magnolia
  • †Lyropecten miguelensis
  • †Lyropecten perrini
• †Lyrosurcula – tentative report

• †Machaeromeryx – tentative report
  • †Machaeromeryx tragulus

• 

  †Machairodus
• Macoma
  • †Macoma andersoni
  • †Macoma calcarea
  • †Macoma carlottensis
  • †Macoma copelandi
  • †Macoma diabloensis
  • †Macoma expansa
  • †Macoma indentata
  • †Macoma inquinata
  • †Macoma moesta

  • 

    †Macoma nasuta
  • †Macoma pabloensis – or unidentified comparable form
  • †Macoma panzana
  • †Macoma planiuscula – or unidentified comparable form
  • †Macoma secta
  • †Macoma viticola
• Macrarene
• Macrocallista
  • †Macrocallista furlongi – or unidentified comparable form
  • †Macrocallista horni – or unidentified comparable form
  • †Macrocallista meganosensis – type locality for species
  • †Macrocallista pittsburgensis
  • †Macrocallista squalida
  • †Macrocallista squalidus
  • †Macrocallista weaveri
• †Macrochlamis
  • †Macrochlamis magnolia

• 

  †Macrodelphinus – type locality for genus
  • †Macrodelphinus kelloggi – type locality for species
• †Macrotarsius
  • †Macrotarsius roederi – type locality for species
• Mactromeris
  • †Mactromeris abbotti
  • †Mactromeris acutirostrata – or unidentified comparable form
  • †Mactromeris albaria
  • †Mactromeris bisculpturata – or unidentified comparable form
  • †Mactromeris brevirostrata
  • †Mactromeris catilliformis
  • †Mactromeris hemphillii
  • †Mactromeris mercedensis – or unidentified comparable form
  • †Mactromeris merriami
  • †Mactromeris montereyana – type locality for species
  • †Mactromeris muliniaformis – type locality for species
  • †Mactromeris pittsburgensis – or unidentified comparable form
  • †Mactromeris polynyma
  • †Mactromeris ramonensis
  • †Mactromeris rushi
  • †Mactromeris sectoris
  • †Mactromeris tejonensis
• Mactrotoma
  • †Mactrotoma californica
  • †Mactrotoma nasuta
• Madracis
  • †Madracis wellsi – type locality for species
• Madrepora
  • †Madrepora solida – type locality for species

• 

  Magnolia
  • †Magnolia corrallina
  • †Magnolia dayana
• Mahonia
  • †Mahonia macginitiei
  • †Mahonia reticulata
  • †Mahonia simplex
• Makaira
• Malea
  • †Malea ringens
• Malletia
• Mallotus
  • †Mallotus riparius
• †Mambrinia
  • †Mambrinia gallica – type locality for species
• †Mammut^[3]
  • †Mammut americanum – all local specimens previously referred to this species have since been reclassified in the new species M. pacificus.^[3]
  • †Mammut cosoensis
  • †Mammut matthewi
  • †Mammut pacificus – type locality for species. Many specimens were previously regarded as specimens of M. americanum.^[3]
• †Mammuthus
  • †Mammuthus columbi
  • †Mammuthus exilis
  • †Mammuthus hayi

  • 

    †Mammuthus primigenius
• †Mancalla – type locality for genus
  • †Mancalla californiensis – type locality for species
  • †Mancalla cedrosensis – or unidentified comparable form
  • †Mancalla diegenesis
  • †Mancalla diegensis – type locality for species
  • †Mancalla emlongi – type locality for species
  • †Mancalla lucasi – type locality for species
  • †Mancalla milleri – type locality for species
  • †Mancalla vegrandis
  • †Mancalla vergrandis – type locality for species
• †Mangelia
  • †Mangelia variegata
• †Margaritana
  • †Margaritana falcata – or unidentified comparable form
• Margarites
  • †Margarites pupillus

• 

  Marginella
• Marginulina
  • †Marginulina adunca – or unidentified comparable form
  • †Marginulina dubia
  • †Marginulina eximia
  • †Marginulina munda
• Marmota
• †Marshochoerus
  • †Marshochoerus socialis

• 

  Martes
• Martesia
  • †Martesia meganosensis – type locality for species
• †Martinogale
  • †Martinogale faulli – type locality for species
• Martinottiella
  • †Martinottiella eocenica
• Maxwellia
  • †Maxwellia gemma
• †Mayena – tentative report
  • †Mayena kewi – or unidentified comparable form
• †Mealanitta
  • †Mealanitta deglandi
• †Mediochoerus
  • †Mediochoerus mohavensis
• †Megacamelus
  • †Megacamelus merriami
• Megachasma
  • †Megachasma applegatei – type locality for species
• Megachile
  • †Megachile gentilis
• †Megahippus
  • †Megahippus matthewi
  • †Megahippus mckennai – type locality for species

• 

  †Megalonyx
  • †Megalonyx jeffersonii
  • †Megalonyx mathisi – type locality for species
  • †Megalonyx wheatleyi
• Megalops – tentative report
  • †Megalops vigilax
• †Megapaloelodus
  • †Megapaloelodus connectens
• †Megapetalus
• Megaptera
  • †Megaptera miocaena – type locality for species
• Megatebennus
  • †Megatebennus bimaculata
  • †Megatebennus bimaculatus
• Megathura – tentative report
• †Megatylopus
  • †Megatylopus matthewi – or unidentified comparable form
• †Megistostoma
  • †Megistostoma gabbiana – or unidentified comparable form
• Melampus
  • †Melampus olivaceous
  • †Melampus olivaceus
• Melanella
  • †Melanella hastata
  • †Melanella micans
• Melanitta
  • †Melanitta ceruttii – type locality for species
  • †Melanitta deglandi – tentative report
  • †Melanitta fusca
  • †Melanitta perspicillata
• Melanoplus
  • †Melanoplus differentialis
• Melanthrips
• Meleagris
  • †Meleagris richmondi – type locality for species
• †Meliosma
  • †Meliosma truncata – type locality for species
• †Melosira
  • †Melosira solida
• Melospiza
  • †Melospiza melodia
• †Meniscomys
• †Meniscotherium
  • †Meniscotherium tapiacitum

• 

  †Menoceras
  • †Menoceras barbouri
• Mephitis
  • †Mephitis mephitis
• †Mercyhippus – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Mercyhippus brevidontus
• Meretrix
  • †Meretrix californica
  • †Meretrix conradi
  • †Meretrix hornii
  • †Meretrix lorenzana
  • †Meretrix palmeri – type locality for species
  • †Meretrix stantoni
  • †Meretrix uvasana – type locality for species
• Mergus
  • †Mergus serrator
• Merluccius
  • †Merluccius productus
• †Merriamina – type locality for genus
  • †Merriamina ectenes – type locality for species

• 

  †Merriamoceros
  • †Merriamoceros coronatus – type locality for species
• †Merychippus
  • †Merychippus brevidontus – type locality for species
  • †Merychippus californicus – type locality for species
  • †Merychippus relictus – or unidentified comparable form
  • †Merychippus stevensi
• †Merychyus
  • †Merychyus elegans
  • †Merychyus minimus
  • †Merychyus novomexicanus
  • †Merychyus smithi
• †Merycobunodon
  • †Merycobunodon littoralis – type locality for species

• 

  †Merycodus
  • †Merycodus joraki
  • †Merycodus necatus
• Mesalia
  • †Mesalia clarki – type locality for species
  • †Mesalia martinezensis
• †Mesocyon
  • †Mesocyon brachyops
  • †Mesocyon coryphaeus
• †Mesodma – tentative report
• †Mesohippus
• Mesophyllum
  • †Mesophyllum californicum
  • †Mesophyllum fructiferum
  • †Mesophyllum obsitum
  • †Mesophyllum schenckii – type locality for species
  • †Mesophyllum schenki

• 

  †Mesoreodon
  • †Mesoreodon chelonyx
• †Metacerithium
  • †Metacerithium packardi
• †Metalopex
  • †Metalopex merriami
• †Metanoiamys
  • †Metanoiamys agorus – type locality for species
  • †Metanoiamys fantasma
  • †Metanoiamys korthi – type locality for species
  • †Metanoiamys marinus – type locality for species
• †Metarhinus
  • †Metarhinus pater – type locality for species
• †Metatomarctus
  • †Metatomarctus canavus

• 

  †Metaxytherium
  • †Metaxytherium arctodites
• †Metechinus
  • †Metechinus amplior
• †Miacis
  • †Miacis hookwayi – type locality for species
• †Michenia
  • †Michenia agatensis
  • †Michenia mudhillsensis
• Micranellum
  • †Micranellum crebricinctum
• †Microcosmodon – or unidentified comparable form
• Microdipodops

• 

  Microgadus – tentative report
• †Micropallus
  • †Micropallus whitneyi
• †Microparamys
  • †Microparamys minutus – or unidentified comparable form
  • †Microparamys tricus – type locality for species
  • †Microparamys woodi – type locality for species
• †Microsula
• †Microsyops
  • †Microsyops annectens – or unidentified comparable form
  • †Microsyops kratos – type locality for species
• †Microtomarctus
  • †Microtomarctus conferta
• Microtus

  • 

    †Microtus californicus
  • †Microtus meadensis
  • †Microtus miguelensis – type locality for species
• Mictomys
  • †Mictomys kansasensis
  • †Mictomys vetus
• Miltha
  • †Miltha meganosensis – type locality for species
  • †Miltha packi
  • †Miltha sanctaecrucis
  • †Miltha xantusi
• †Mimomys
• †Mimotricentes
  • †Mimotricentes tedfordi – type locality for species
• †Miochlorotettix – type locality for genus
  • †Miochlorotettix gibroni – type locality for species
  • †Miochlorotettix kirkbyi – type locality for species
• †Miocryptorhopalum – type locality for genus
  • †Miocryptorhopalum kirkbyae – type locality for species
• †Miocyon
  • †Miocyon scotti – or unidentified comparable form
• †Miodelphis – type locality for genus
  • †Miodelphis californicus – type locality for species
• †Miogonates – type locality for genus
  • †Miogonates subimpunctatus – type locality for species
• †Miohierax – type locality for genus
  • †Miohierax stocki – type locality for species
• †Miohippus
  • †Miohippus annectens
• †Miolabis
  • †Miolabis californicus – type locality for species
  • †Miolabis fricki – type locality for species

• 

  †Miomancalla
  • †Miomancalla howardi – type locality for species
  • †Miomancalla wetmorei – type locality for species
• †Miomesamia – type locality for genus
  • †Miomesamia juliae – type locality for species
• †Miomonalonion – type locality for genus
  • †Miomonalonion conoidifrons – type locality for species
• †Miomustela
• †Mionictis
  • †Mionictis angustidens
• †Miospermophilus
  • †Miospermophilus wyomingensis – or unidentified comparable form
• †Miosula – type locality for genus
  • †Miosula media – type locality for species
• †Miotapirus
• †Miotomodon
  • †Miotomodon mayi – type locality for species
• †Miotroctes – type locality for genus
  • †Miotroctes rousei – type locality for species
• †Miotylopus
  • †Miotylopus gibbi

• 

  †Miracinonyx
  • †Miracinonyx studeri – tentative report
• Mirounga
  • †Mirounga angustirostris – or unidentified comparable form
• Mitra
  • †Mitra fultoni
  • †Mitra idae
  • †Mitra idea
  • †Mitra simplicissima
• Mitrella
  • †Mitrella carinata
  • †Mitrella gausapata
  • †Mitrella gouldi
  • †Mitrella tuberosa
• †Mixocetus – type locality for genus
  • †Mixocetus elysius – type locality for species
• Modiolatus
  • †Modiolatus rectus
• Modiolus

  • 

    †Modiolus capax – or unidentified comparable form
  • †Modiolus carpenteri
  • †Modiolus multiradiatus
  • †Modiolus ornatus
  • †Modiolus veronensis
  • †Modiolus ynezianus
• Modulus
  • †Modulus unidens
• †Mojavemys
  • †Mojavemys alexandrae – type locality for species
  • †Mojavemys lophatus
  • †Mojavemys wilsoni
• †Molopophorus
  • †Molopophorus aequicostatus – or unidentified comparable form
  • †Molopophorus antiquatus
  • †Molopophorus biplicatus
  • †Molopophorus californicus – type locality for species
  • †Molopophorus dalli
  • †Molopophorus tejonensis
• Moniliopsis
  • †Moniliopsis incisa

• 

  Monoplex
  • †Monoplex amictus
• †Monosaulax
  • †Monosaulax pansus
• Montipora
• †Mookomys
  • †Mookomys formicarum
  • †Mookomys subtilis
• Mopalia
  • †Mopalia acuta
  • †Mopalia ciliata
  • †Mopalia lignosa – or unidentified comparable form

• 

  †Moropus
• Morula
  • †Morula lugubris
• Morus – or unidentified comparable form
• Morus
  • †Morus humeralis – type locality for species
  • †Morus lompocanus – type locality for species
  • †Morus magnus – type locality for species
  • †Morus recentior – type locality for species
  • †Morus reyana – type locality for species
  • †Morus reyma
  • †Morus reyna
  • †Morus vagabundus – type locality for species
• Mulinia
  • †Mulinia pallida
• Murex – or unidentified related form
  • †Murex mansfieldi – or unidentified related form
• Musculus
• Mustela
  • †Mustela americana – type locality for species
  • †Mustela frenata
• †Mya
  • †Mya dickersoni
  • †Mya fujiei
  • †Mya truncata
• †Myadesma
  • †Myadesma pacifica
• Myctophum
• Myliobatis
  • †Myliobatis californicus

• 

  †Mylohyus
  • †Mylohyus fossilis
• †Mylopharodon
  • †Mylopharodon conocephalus
• Mysella
  • †Mysella aleutica
• Mytilimeria
  • Mytilimeria nuttalli
• Mytilus
  • †Mytilus arnoldi

  • 

    †Mytilus californianus
  • †Mytilus edulis
  • †Mytilus expansus
  • †Mytilus loeli
  • †Mytilus mathewsoni
  • †Mytilus mathewsonii
  • †Mytilus middendorffi
• †Mytonolagus
• †Mytonomys
  • †Mytonomys burkei – type locality for species
  • †Mytonomys mytonensis – or unidentified comparable form
• Myurella
  • †Myurella martini

• 

  †Nannippus
• †Nannocetus – type locality for genus
  • †Nannocetus eremus – type locality for species
• †Nannolithax – type locality for genus
  • †Nannolithax gracilis – type locality for species
• †Nanotragulus
  • †Nanotragulus ordinatus – tentative report
• Narona
  • †Narona clavatula
• Nassa
  • †Nassa cerritensis
  • †Nassa delosi
  • †Nassa fossata
  • †Nassa mendica
  • †Nassa perpinguis
  • †Nassa tegula
• Nassarius
  • †Nassarius californianus
  • †Nassarius cerritensis

  • 

    †Nassarius fossatus
  • †Nassarius grammatus
  • †Nassarius hamlini
  • †Nassarius inquus
  • †Nassarius mendicus
  • †Nassarius perpinguis
  • †Nassarius stocki
  • †Nassarius tegula
  • †Nassarius whitneyi
• Natica
  • †Natica lewisi – or unidentified related form
  • †Natica recluziana
  • †Natica uvasana
• Naticarius
  • †Naticarius unifasciata

• 

  †Navahoceros
• Nectandra
  • †Nectandra presanguinea
• Negaprion
  • †Negaprion antiquus
  • †Negaprion elongata – or unidentified comparable form
• †Nekrolagus
• †Nelumbium
  • †Nelumbium lacunosum – type locality for species
• Nemocardium
  • †Nemocardium centifilosum
  • †Nemocardium linteum
• †Neobernaya
  • †Neobernaya fernandoensis
  • †Neobernaya spadicea
• †Neoculicoides – type locality for genus
  • †Neoculicoides jeanneae – type locality for species
• †Neogyps
  • †Neogyps errans
• †Neohipparion
  • †Neohipparion eurystyle
  • †Neohipparion gidleyi – type locality for species
  • †Neohipparion leptode
  • †Neohipparion trampasense
• †Neoliotomus – or unidentified comparable form
• †Neolitsea
  • †Neolitsea lata – type locality for species

• 

  †Neoparadoxia – type locality for genus
  • †Neoparadoxia cecilialina – type locality for species
  • †Neoparadoxia repenningi – type locality for species
• Neophrontops
  • †Neophrontops americanus
• †Neoplagiaulax
• Neotamias
  • †Neotamias senex
• †Neotherium – type locality for genus
  • †Neotherium mirum – type locality for species
• Neotoma
  • †Neotoma cinerea – type locality for species
  • †Neotoma fossilis
  • †Neotoma fuscipes
  • †Neotoma lepida
  • †Neotoma quadriplicata
  • †Neotoma sawrockensis
  • †Neotoma taylori
• Neptunea
  • †Neptunea andersoni
  • †Neptunea eurekaensis
  • †Neptunea lawsoni
  • †Neptunea lirata
  • †Neptunea mucronata
  • †Neptunea pulchra
  • †Neptunea scotiaensis
  • †Neptunea tabiilata – or unidentified comparable form
  • †Neptunea tabulata
• Nerita
  • †Nerita beali – tentative report

• 

  Neritina
  • †Neritina picta
• †Nerium
  • †Nerium hinoidea – type locality for species
• †Nerterogeomys
  • †Nerterogeomys anzensis
  • †Nerterogeomys garbanii
• Neverita
  • †Neverita alta
  • †Neverita callosa
  • †Neverita globosa
  • †Neverita reclusiana
  • †Neverita reclusianus
  • †Neverita recluziana
  • †Neverita recluzianus
  • †Neverita secta – or unidentified comparable form
  • †Neverita thomsonae
• Nicrophorus
  • †Nicrophorus guttula
  • †Nicrophorus marginatus – type locality for species
  • †Nicrophorus nigrita
• †Nimravides
  • †Nimravides thinobates

• 

  †Nimravus
• Niso – tentative report
  • †Niso antiselli
• †Nitzschia
  • †Nitzschia reinholdi
  • †Nitzschia romana
• Nodipecten
  • †Nodipecten cerrosensis
  • †Nodipecten estrellanus
  • †Nodipecten subnodosus
• Nodogenerina
  • †Nodogenerina adolphina
  • †Nodogenerina advena
  • †Nodogenerina sanctaecrucis
  • †Nodogenerina wegemanni
• Nodosaria
  • †Nodosaria holserica
  • †Nodosaria longiscata
  • †Nodosaria pyrula
• Nonion
  • †Nonion incisum
• †Nonomys
  • †Nonomys gutzleri – type locality for species
• Norrisia
  • †Norrisia norrisii
• †Nothroptheriops
  • †Nothroptheriops shastense – or unidentified comparable form

• 

  †Nothrotheriops
  • †Nothrotheriops texanus
• †Nothrotherium
  • †Nothrotherium shastense – type locality for species
• Notiosorex
  • †Notiosorex crawfordi
  • †Notiosorex jacksoni
• Notoacmea
  • †Notoacmea inessa
• Notorhynchus
• †Nototamias
• Nucella
  • †Nucella elsmerensis
  • †Nucella emarginata
  • †Nucella lamellosa
  • †Nucella lima
  • †Nucella spirata
  • †Nucella trancosana
• Nucula
  • †Nucula exigua
  • †Nucula gabbiana
  • †Nucula washingtonensis
• Nuculana
  • †Nuculana gabbi – or unidentified comparable form
  • †Nuculana ochsneri
  • †Nuculana ramonensis
• Numenius

  • 

    †Numenius phaeopus
• Nutricola
  • †Nutricola cymata
  • †Nutricola ovalis
  • †Nutricola salmonea
  • †Nutricola tantilla
• Nuttallia
  • †Nuttallia nuttallii
• †Nyctitherium – or unidentified comparable form
• Nyctoporis
  • †Nyctoporis carinata
• †Nyssa
  • †Nyssa californica
  • †Nyssa copeana

• †Ocajila – or unidentified comparable form
• Oceanodroma

  • 

    †Oceanodroma furcata
  • †Oceanodroma homochroa
  • †Oceanodroma hubbsi – type locality for species
• †Ocenbra
  • †Ocenbra topangensis – or unidentified comparable form
• Ocenebra
  • †Ocenebra barbarensis – or unidentified comparable form
  • †Ocenebra circumtexta
  • †Ocenebra foveolata
  • †Ocenebra interfossa
  • †Ocenebra lurida
  • †Ocenebra poulsoni
  • †Ocenebra tenuisculpta
  • †Ocenebra topangensis
• Ocotea
  • †Ocotea ovoidea
  • †Ocotea perseaformis
• †Ocystias
  • †Ocystias sagitta
• †Odaxosaurus
• Odobenus

  • 

    †Odobenus rosmarus
• Odocoileus
  • †Odocoileus hemionus
  • †Odocoileus virginianus – or unidentified comparable form
• Odontaspis
  • †Odontaspis ferox
• †Odontogryphaea – tentative report
  • †Odontogryphaea haleyi
• Odostomia
  • †Odostomia avellana
  • †Odostomia beringi – or unidentified comparable form
  • †Odostomia californica – or unidentified comparable form
  • †Odostomia callimene – or unidentified related form
  • †Odostomia columbiana – or unidentified comparable form
  • †Odostomia diaboli

  • 

    †Odostomia donilla
  • †Odostomia eugena
  • †Odostomia farallonensis
  • †Odostomia fetella
  • †Odostomia gravida
  • †Odostomia helena
  • †Odostomia minutissima – or unidentified comparable form
  • †Odostomia nemo
  • †Odostomia nota
  • †Odostomia stephensae
  • †Odostomia tacomoensis
  • †Odostomia tenuisculpta – or unidentified comparable form
• †Oedolithax – type locality for genus
  • †Oedolithax mira – type locality for species
• Oenopota
  • †Oenopota fidicula

  • 

    †Oenopota tabulata
• Ogmodontomys
  • †Ogmodontomys sawrockensis
• †Olequahia
  • †Olequahia domenginica
  • †Olequahia lorenzana
• †Oligoryctes
• Oliva
  • †Oliva californica
  • †Oliva meganosensis – type locality for species
  • †Oliva spicata
• Olivella
  • †Olivella baetica
  • †Olivella biplicata
  • †Olivella gracilis
  • †Olivella mathewsoni
  • †Olivella mathewsonii
  • †Olivella pedroana
  • †Olivella santana – type locality for species
• †Omomys
  • †Omomys carteri – or unidentified comparable form
• Oncorhynchus

  • 

    †Oncorhynchus rastrosus
• Ondatra
  • †Ondatra idahoensis
  • †Ondatra minor
• Oneirodes
• Onthophagus
  • †Onthophagus everestae – type locality for species
• Onychomys
  • †Onychomys gidleyi
  • †Onychomys torridus
• Ophiodermella
  • †Ophiodermella graciosana
  • †Ophiodermella inermis
• †Ophiomys
  • †Ophiomys parvus
• †Opisima – tentative report
  • †Opisima pacifica – or unidentified comparable form
• †Opisthonema
  • †Opisthonema palosverdensis – type locality for species
• Oreamnos
  • †Oreamnos americanus
• Oreortyx
  • †Oreortyx picta
• Orthemis
  • †Orthemis ferruginea
• Orthodon
• †Osbornodon
  • †Osbornodon fricki

• 

  †Osteodontornis – type locality for genus
  • †Osteodontornis orri – type locality for species
• Ostrea
  • †Ostrea angelica
  • †Ostrea atwoodii
  • †Ostrea bourgeosi
  • †Ostrea conchaphila
  • †Ostrea hertleini
  • †Ostrea lincolnensis – or unidentified related form
  • †Ostrea lurida
  • †Ostrea subtitan
  • †Ostrea weaveri

• 

  †Otodus
  • †Otodus angustidens
  • †Otodus megalodon
• †Ottoceros
  • †Ottoceros peacevalleyensis – type locality for species
• Otus
  • †Otus asio
• †Ourayia
• Ovibos
  • †Ovibos moschatus
• Ovis
  • †Ovis canadensis
• †Oxyrhina
  • †Oxyrhina crassa
• †Oxyura

  • 

    †Oxyura jamaicensis
• †Ozymandias – type locality for genus
  • †Ozymandias gilberti – type locality for species

• †Pachycrommium
  • †Pachycrommium clarki
• †Paciculus
• †Pacifichelys
  • †Pacifichelys hutchisoni – type locality for species
• †Pacipecten
  • †Pacipecten discus
  • †Pacipecten pabloensis – or unidentified comparable form
• †Palaeolagus
• †Palaeolama
  • †Palaeolama mirifica – or unidentified related form
• †Palaeopsammia
  • †Palaeopsammia zitteli
• †Palaeoxantusia
  • †Palaeoxantusia allisoni
  • †Palaeoxantusia kyrentos

• 

  †Paleoparadoxia
  • †Paleoparadoxia tabatai
• †Paleosula – type locality for genus
  • †Paleosula stocktoni – type locality for species
• Palpomyia – type locality for genus
  • †Palpomyia freyi – type locality for species
  • †Palpomyia multispinosa – type locality for species
  • †Palpomyia ryshkoffi – type locality for species
  • †Palpomyia shilo – type locality for species
• Pandora
  • †Pandora punctata
  • †Pandora wardiana
• †Panolax
  • †Panolax sanctaefidei
• Panomya
  • †Panomya ampla
• Panopea
  • †Panopea abrupta
  • †Panopea estrellana – or unidentified related form
  • †Panopea ramonensis
  • †Panopea smithii
  • †Panopea tenuis
• Panthera

  • 

    †Panthera leo
  • †Panthera onca – or unidentified comparable form
• †Parabalaenoptera – type locality for genus
  • †Parabalaenoptera baulinensis – type locality for species
• Paraconcavus
  • †Paraconcavus margaritanus
  • †Paraconcavus pacificus
• †Paracontogenys
  • †Paracontogenys estesi
• †Paracosoryx
  • †Paracosoryx alticornis
  • †Paracosoryx furlongi
• †Paraculicoides – type locality for genus
  • †Paraculicoides rouseae – type locality for species
• Paracyathus
  • †Paracyathus pedroensis – type locality for species
  • †Paracyathus stearnsii
• †Paracynarctus
  • †Paracynarctus kelloggi
• †Paradjidaumo
  • †Paradjidaumo reynoldsi – type locality for species
• †Paradomnina
  • †Paradomnina relictus – or unidentified comparable form
• †Parafundulus
  • †Parafundulus erdisi

• 

  †Parahippus
  • †Parahippus maxsoni – type locality for species
  • †Parahippus pawniensis
• †Parahyus
• †Paralichthyes
• Paralichthys – type locality for genus
  • †Paralichthys antiquus
• †Paramerychyus
  • †Paramerychyus harrisonensis
  • †Paramerychyus relictus
• †Paramiolabis
  • †Paramiolabis minutus – type locality for species
  • †Paramiolabis singularis – or unidentified comparable form
  • †Paramiolabis taylori
  • †Paramiolabis tenuis

• 

  †Paramylodon
  • †Paramylodon harlani
• †Paramys
  • †Paramys compressidens – or unidentified comparable form
  • †Paramys leptodus – or unidentified comparable form
• †Parapavo
  • †Parapavo californica
  • †Parapavo californicus
• †Parapliohippus
  • †Parapliohippus carrizoensis – type locality for species

• 

  †Parapontoporia
  • †Parapontoporia sternbergi – type locality for species
  • †Parapontoporia wilsoni – type locality for species
• †Parasauromalus
  • †Parasauromalus olseni
• Paraseraphs
  • †Paraseraphs erraticus
• †Parastylotermes
  • †Parastylotermes calico – type locality for species
  • †Parastylotermes frazieri – type locality for species
• †Paratomarctus
  • †Paratomarctus temerarius
• †Pareumys
  • †Pareumys grangeri
  • †Pareumys milleri

• 

  †Parietobalaena
  • †Parietobalaena securis – type locality for species
• †Paromomys
  • †Paromomys depressidens
• †Paronychomys
• †Parribacus
  • †Parribacus caesius – type locality for species
• Parvamussium
• †Parvicornus – type locality for genus
  • †Parvicornus occidentalis – type locality for species
• Parvilucina
  • †Parvilucina approximata
  • †Parvilucina tenuisculpta
• †Parvisipho – tentative report
  • †Parvisipho meganosensis – type locality for species

• 

  Patelloida
  • †Patelloida tejonensis
  • †Patelloida triquetrus
• Patinopecten
  • †Patinopecten caurinus
  • †Patinopecten coosensis
  • †Patinopecten healeyi
  • †Patinopecten healyi
  • †Patinopecten lohri
  • †Patinopecten propatulus
• †Patriolestes
  • †Patriolestes novaceki – type locality for species
• †Pauromys
  • †Pauromys lillegraveni – type locality for species
• †Pecoripeda

• 

  Pecten
  • †Pecten bellus
  • †Pecten bowersi
  • †Pecten dickersoni
  • †Pecten estrellanis
  • †Pecten magnolia
  • †Pecten nevadensis
  • †Pecten perrini
  • †Pecten sespeensis
• †Pedalion
  • †Pedalion panzana – or unidentified comparable form
• †Pediomeryx
  • †Pediomeryx hemphillensis
• †Pedipes
  • †Pedipes liratus
  • †Pedipes unisulcatus
• †Pelagiarctos – type locality for genus
  • †Pelagiarctos thomasi – type locality for species

• 

  †Pelagornis
• Pelecanus
  • †Pelecanus erythrorhynchus – or unidentified comparable form
  • †Pelecanus occidentalis
• †Peltosaurus
  • †Peltosaurus macrodon – type locality for species
• Penitella
  • †Penitella penita
• †Peraceras
  • †Peraceras superciliosum
• †Peradectes
  • †Peradectes californicus
• †Periaster
• Pericosmus
• †Peridiomys
  • †Peridiomys oregonensis – or unidentified comparable form

• 

  Periglypta
  • †Periglypta multicostata
• Periploma
  • †Periploma planiuscula
  • †Periploma stewartvillensis – type locality for species
• †Peripolocetus – type locality for genus
  • †Peripolocetus vexillifer – type locality for species
• †Perissitys
  • †Perissitys stewarti
• †Perissolax
  • †Perissolax blakei
  • †Perissolax tricarinatus
• †Perognathoides
  • †Perognathoides eurekensis

• 

  Perognathus
  • †Perognathus furlongi
  • †Perognathus minutus
• Peromyscus
  • †Peromyscus baumgartneri
  • †Peromyscus boylei
  • †Peromyscus complexus – type locality for species
  • †Peromyscus dentalis
  • †Peromyscus hagermanensis
  • †Peromyscus irvingtonensis – type locality for species
  • †Peromyscus maximus – type locality for species
  • †Peromyscus truei – or unidentified comparable form
• †Perse
  • †Perse lincolnensis
• Persea
  • †Persea coalingensis
  • †Persea praelingue
  • †Persea pseudocarolinensis

• 

  Persististrombus
  • †Persististrombus obliteratus – type locality for species
• †Petauristodon
  • †Petauristodon jamesi
  • †Petauristodon mathewsi
  • †Petauristodon minimus
  • †Petauristodon uphami
• Petricola
  • †Petricola carditoides
  • †Petricola cognata
  • †Petricola denticulata
  • †Petricola parallela
• Petrophyllia
  • †Petrophyllia clarki
  • †Petrophyllia weaveri
• †Pewelagus
  • †Pewelagus dawsonae
• Phacoides
  • †Phacoides actulineatus
  • †Phacoides sactaecrucis – tentative report
• Phalacrocorax

  • 

    †Phalacrocorax auritus
  • †Phalacrocorax femoralis – type locality for species
  • †Phalacrocorax kennelli – type locality for species
  • †Phalacrocorax pelagicus
  • †Phalacrocorax penicillatus
  • †Phalacrocorax penincillatus
  • †Phalacrocorax penincullatus
  • †Phalacrocorax rogersi – type locality for species
• Phalaropus
  • †Phalaropus fulicaria
  • †Phalaropus lobatus
• †Phanaeus
  • †Phanaeus labreae – type locality for species
• †Phelosaccomys
  • †Phelosaccomys shotwelli – type locality for species
• †Phenacolemur
  • †Phenacolemur shifrae

• 

  †Phlaocyon
  • †Phlaocyon taylori
• †Phlepsius
  • †Phlepsius weissmanae – type locality for species
• Phloeodes
  • †Phloeodes diabolicus
  • †Phloeodes plicatus
• †Phoberogale
  • †Phoberogale shareri – type locality for species
• Phoca
  • †Phoca vitulina – or unidentified comparable form
• Phocoena – or unidentified comparable form
• †Phoebastria
  • †Phoebastria albatrus – type locality for species
  • †Phoebastria anglica – type locality for species

• 

  Phoenicopterus – or unidentified comparable form
• Pholadidea
• Pholadomya
  • †Pholadomya mounti
  • †Pholadomya nasuta
• Pholas
  • †Pholas gabbi
• Phos
  • †Phos blakianus – or unidentified comparable form
  • †Phos dumbleanus
• †Photinia
  • †Photinia miocenica

• 

  Phrynosoma
• †Phyllites
  • †Phyllites californica
  • †Phyllites coalingensis
  • †Phyllites cordiaefolia – type locality for species
  • †Phyllites daturaefolia – type locality for species
  • †Phyllites domenginensis
  • †Phyllites ellipticus
  • †Phyllites laurinea
  • †Phyllites temblorensis
• Phyllonotus
  • †Phyllonotus hippocastanum
  • †Phyllonotus radix

• 

  Physa
• †Physiculua
• Phytocrene
  • †Phytocrene sordida
• Picea
  • †Picea lahontense
  • †Picea magna
  • †Picea sonomensis
• †Pimelometopodon
  • †Pimelometopodon pulchrum – or unidentified comparable form
• Pimelometopon
  • †Pimelometopon pulchrum
• Pinna
  • †Pinna alamedaensis
  • †Pinna latrania – type locality for species
  • †Pinna lewisi
  • †Pinna llajasensis – type locality for species
  • †Pinna mendenhalli – type locality for species
• †Pinnarctidion – type locality for genus
  • †Pinnarctidion bishopi – type locality for species
• Pinus
  • †Pinus carmelensis – type locality for species
  • †Pinus muricata
  • †Pinus prelambertiana – or unidentified comparable form
  • †Pinus radiata
  • †Pinus sturgisii
  • †Pinus temblorensis
• Piranga
  • †Piranga ludoviciana
• †Piscolithax

• 

  Pitar
  • †Pitar avenalensis – tentative report
  • †Pitar behri
  • †Pitar california – or unidentified comparable form
  • †Pitar californiana
  • †Pitar campi – or unidentified comparable form
  • †Pitar dalli
  • †Pitar joaquinensis
  • †Pitar newcombianus
  • †Pitar quadratus
  • †Pitar stantoni – or unidentified comparable form
  • †Pitar tejonensis – or unidentified comparable form
  • †Pitar uvasana
  • †Pitar uvasanus
• †Pithanodelphis
• †Pithanotaria – type locality for genus
  • †Pithanotaria starri – type locality for species
• Pituophis

  • 

    †Pituophis melanoleucus
• Pitymys
  • †Pitymys mcnowni – or unidentified comparable form
• Placunanomia
  • †Placunanomia granti
• Planularia
  • †Planularia caribbeana
• †Platanophyllum
  • †Platanophyllum angustiloba
  • †Platanophyllum whitenyi
  • †Platanophyllum whitneyi
• Platanus
  • †Platanus angustilobus – type locality for species
  • †Platanus appendiculata
  • †Platanus coloradensis
  • †Platanus dissecta – or unidentified comparable form
  • †Platanus paucidentata

• 

  †Platygonus
  • †Platygonus bicalcaratus
  • †Platygonus vetus
• †Platylithax – type locality for genus
  • †Platylithax robusta – type locality for species
• Platynus
  • †Platynus funebris – or unidentified comparable form
• Platyodon
  • †Platyodon cancellata
  • †Platyodon cancellatus
• †Platyoptera
  • †Platyoptera pacifica
• Platytrochus
  • †Platytrochus diabloensis – type locality for species
  • †Platytrochus merriami – type locality for species
• †Plectina
  • †Plectina garzaensis
  • †Plectina ruthenica – or unidentified comparable form
• Plectofrondicularia
  • †Plectofrondicularia kerni
  • †Plectofrondicularia miocenica
  • †Plectofrondicularia packardi
  • †Plectofrondicularia trinitatensis
  • †Plectofrondicularia vaughani
• †Plectrites
  • †Plectrites classeni
• Plegadis
  • †Plegadis chihi
• †Pleiolama
  • †Pleiolama vera

• 

  †Plesiadapis
  • †Plesiadapis anceps – or unidentified comparable form
  • †Plesiadapis churchilli – or unidentified comparable form
• †Plesiogulo
  • †Plesiogulo lindsayi
  • †Plesiogulo marshalli
• Pleurofusia
  • †Pleurofusia fresnoensis
  • †Pleurofusia lindavistaensis – or unidentified related form
• †Pleuroncodes
• †Pleuronichthys
  • †Pleuronichthys veliger
• †Pliauchenia
  • †Pliauchenia magnifontis – or unidentified comparable form
• †Plioceros
• †Pliocyon
  • †Pliocyon medius

• 

  †Pliohippus
  • †Pliohippus coalingensis – type locality for species
  • †Pliohippus fairbanksi – type locality for species
  • †Pliohippus spectans – tentative report
• †Pliometanastes
  • †Pliometanastes protistus
• †Plionarctos
  • †Plionarctos edensis – type locality for species
• †Plionictis
  • †Plionictis ogygia – or unidentified comparable form

• 

  †Pliopedia – type locality for genus
  • †Pliopedia pacifica – type locality for species
• †Pliotaxidea
  • †Pliotaxidea garberi – type locality for species
• †Pliotomodon
  • †Pliotomodon primitivus – type locality for species
• †Plithocyon
  • †Plithocyon barstowensis
• †Plotopterum – type locality for genus
  • †Plotopterum joaquinensis – type locality for species
• Pluvialis
  • †Pluvialis squatarola
• Pneumatophorus
  • †Pneumatophorus grex – or unidentified comparable form
• †Poabromylus – tentative report
  • †Poabromylus robustus

• 

  Pocillopora
• Podiceps
  • †Podiceps arndti
  • †Podiceps auritus
  • †Podiceps discors
  • †Podiceps nigricolis
  • †Podiceps parvus
  • †Podiceps subparvus
• Podilymbus
  • †Podilymbus podiceps
• Pododesmus
  • †Pododesmus macrochisma
• †Poebrodon
  • †Poebrodon californicus – type locality for species

• 

  †Pogonodon
  • †Pogonodon brachyops
• Polinices
  • †Polinices – type locality for species informal
  • †Polinices draconis
  • †Polinices horni – or unidentified comparable form
  • †Polinices hornii
  • †Polinices lewisii
  • †Polinices pinyonensis – or unidentified comparable form
  • †Polinices recluzianys
  • †Polinices rectus – or unidentified related form
  • †Polinices susanaensis
  • †Polinices uber
  • †Polinices washingtonensis – or unidentified comparable form
• Polydora

• 

  Polymesoda
  • †Polymesoda tenuis – or unidentified comparable form
• Polystira
  • †Polystira barretti
• †Pongamia
  • †Pongamia ovata – type locality for species
• †Pontolis – or unidentified comparable form
  • †Pontolis magnus
• Populus
  • †Populus alexanderii
  • †Populus bonhamii
  • †Populus coalingensis
  • †Populus garberii
• Porichthys
  • †Porichthys myriaster

  • 

    †Porichthys notatus
• Porites
  • †Porites carrizensis – type locality for species
• †Portunites
  • †Portunites insculpta
• †Potamides
  • †Potamides carbonica – or unidentified comparable form
  • †Potamides sespeensis
• †Praemancalla – type locality for genus
  • †Praemancalla lagunensis – type locality for species
• †Presbychen – type locality for genus
  • †Presbychen abavus – type locality for species
• †Presbymys
  • †Presbymys lophatus – type locality for species
• Priene
  • †Priene amoldi
  • †Priene oregonensis
  • †Priene scotiaensis
• Prionace

  • 

    †Prionace glauca
• †Priscoficus
  • †Priscoficus caudata
• †Priscofusus
  • †Priscofusus carlsoni – tentative report
  • †Priscofusus hecoxi
  • †Priscofusus lincolnensis
  • †Priscofusus robustus
• †Pristichampsus
• Pristiophorus
• †Pristophorus
• †Proboscipeda
• †Procamelus
  • †Procamelus grandis – or unidentified comparable form
• †Procymophyes – type locality for genus
  • †Procymophyes lithax – type locality for species
• †Procynodictis
  • †Procynodictis progressus
• Procyon
  • †Procyon lotor
  • †Procyon psora
• †Prodipodomys
  • †Prodipodomys idahoensis
  • †Prodipodomys riversidensis – type locality for species
  • †Prodipodomys timoteoensis – type locality for species
• †Prodipoides
  • †Prodipoides lecontei – type locality for species
• Progabbia
• †Proharrymys – or unidentified comparable form
• †Proheteromys
  • †Proheteromys maximus
  • †Proheteromys sulculus
• †Promartes
• †Pronotolagus
  • †Pronotolagus apachensis – or unidentified comparable form
• †Protadjidaumo
• †Protanthias – type locality for genus
  • †Protanthias fossilis – type locality for species
• †Protepicyon
  • †Protepicyon raki – type locality for species
• †Proterixoides
  • †Proterixoides davisi – type locality for species
• †Prothomomys
  • †Prothomomys warrenensis – type locality for species

• 

  †Protitanops
  • †Protitanops curryi – type locality for species
• †Protoarrenurus
  • †Protoarrenurus convergens – type locality for species
• †Protochlorotettix – type locality for genus
  • †Protochlorotettix calico – type locality for species
• †Protohepialus – type locality for genus
  • †Protohepialus comstocki – type locality for species
• †Protolabis
  • †Protolabis barstowensis – type locality for species
• †Protomarctus
  • †Protomarctus optatus
• †Protoreodon
  • †Protoreodon pacificus – type locality for species
  • †Protoreodon parvus – or unidentified comparable form
  • †Protoreodon pumilus
  • †Protoreodon transmontanus
  • †Protoreodon walshi
• †Protosciurus
  • †Protosciurus tecuyensis
• †Protosegestes – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Protosegestes lloydi – type locality for species
• †Protospermophilus
  • †Protospermophilus quatalensis – type locality for species
• †Protostrix
  • †Protostrix californiensis – type locality for species
• †Protosurcula – tentative report
• Protothaca
  • †Protothaca staleyi
• †Protothore – type locality for genus
  • †Protothore explicata – type locality for species

• 

  †Protylopus
  • †Protylopus pearsonensis – type locality for species
  • †Protylopus petersoni – or unidentified comparable form
  • †Protylopus robustus – type locality for species
  • †Protylopus stocki – type locality for species
• Proximitra – tentative report
  • †Proximitra cretacea
• Prunus
  • †Prunus turlockensis
• Psammacoma
  • †Psammacoma acolasta
  • †Psammacoma arctata
  • †Psammacoma yoldiformis
• Psammotreta
  • †Psammotreta dombei
  • †Psammotreta obesa
  • †Psammotreta rostellata
  • †Psammotreta viridotincta

• 

  †Psephophorus
  • †Psephophorus calvertensis – or unidentified comparable form
• †Pseudaelurus
  • †Pseudaelurus intrepidus
  • †Pseudaelurus marshi
• †Pseudoblastomeryx
  • †Pseudoblastomeryx advena
• Pseudochama
  • †Pseudochama exogyra
• †Pseudoglandulina
  • †Pseudoglandulina conica
  • †Pseudoglandulina ovata
  • †Pseudoglandulina turbinata
• Pseudoliva
  • †Pseudoliva dilleri
  • †Pseudoliva inornata – or unidentified comparable form

• 

  Pseudomelatoma
  • †Pseudomelatoma penicillata
• †Pseudoparablastomeryx
  • †Pseudoparablastomeryx scotti – or unidentified comparable form
• †Pseudoparella
• †Pseudoperrisolax
  • †Pseudoperrisolax blakei
• †Pseudoseriola – type locality for genus
  • †Pseudoseriola gillilandi – type locality for species
• †Pseudotheridomys
  • †Pseudotheridomys cuyamensis – type locality for species
• †Pseudotomus
  • †Pseudotomus californicus
  • †Pseudotomus littoralis – type locality for species

• 

  †Pseudotsuga
  • †Pseudotsuga sonomensis
• Pteria
  • †Pteria berryi
  • †Pteria hertleini
  • †Pteria pellucida
• †Pteroplatea
  • †Pteroplatea lapislutosa – type locality for species
• Pteropurpura
  • †Pteropurpura festiva
  • †Pteropurpura trialatus
• Pterostichus
• Pterynotus
  • †Pterynotus petri
  • †Pterynotus washingtonicus

• 

  †Ptilodus
• Ptinus
  • †Ptinus priminidi – type locality for species
• Ptychoramphus
  • †Ptychoramphus aleuticus
• Puffinus
  • †Puffinus barnesi – type locality for species
  • †Puffinus calhouni – type locality for species
  • †Puffinus diatomicus – type locality for species
  • †Puffinus felthami – type locality for species
  • †Puffinus gilmorei – type locality for species
  • †Puffinus gresus
  • †Puffinus grisesus
  • †Puffinus griseus
  • †Puffinus inceptor – type locality for species
  • †Puffinus kanakoffi
  • †Puffinus mitchelli – type locality for species
  • †Puffinus opisthomelas
  • †Puffinus priscus – type locality for species
  • †Puffinus tenuirostris
• Pullenia
  • †Pullenia eocenica
  • †Pullenia quinqueloba

• 

  †Puma
  • †Puma concolor – type locality for species
• Puncturella
  • †Puncturella galeata
  • †Puncturella multistriata
• Pupillaria
  • †Pupillaria optabilis
  • †Pupillaria pupilla
• Purpura
  • †Purpura barbarensis
  • †Purpura festiva
  • †Purpura lima
  • †Purpura lurida
  • †Purpura milicentana – type locality for species
  • †Purpura nuttallii
  • †Purpura poulsoni
  • †Purpura topangensis

• 

  Pusula
  • †Pusula californiana
  • †Pusula solandri
• Pycnodonte
  • †Pycnodonte eldridgei
  • †Pycnodonte heermanni
  • †Pycnodonte pacifica – or unidentified comparable form
  • †Pycnodonte stewarti – or unidentified related form
• Pyramidella
  • †Pyramidella adamsi – or unidentified comparable form
  • †Pyramidella mucronis
  • †Pyramidella preblei
• Pyrene
  • †Pyrene carinata

• †Quercophyllum
  • †Quercophyllum platanoides – type locality for species

• 

  Quercus
  • †Quercus acorns
  • †Quercus coalingensis
  • †Quercus dispersa
  • †Quercus distincta
  • †Quercus domenginensis
  • †Quercus douglasoides
  • †Quercus eoxalapensis – type locality for species
  • †Quercus hannibali
  • †Quercus hannibalii
  • †Quercus lakevillensis
  • †Quercus merriami
  • †Quercus nevadensis
  • †Quercus pasadorii – type locality for species
  • †Quercus pliopalmerii
  • †Quercus pollardiana
  • †Quercus pseudolyrata
  • †Quercus remingtonii
  • †Quercus sayana
  • †Quercus simulata
  • †Quercus temblorensis
  • †Quercus wislizenoides

• Raja
• †Rakomeryx
  • †Rakomeryx sinclairi – type locality for species
• Rallus
  • †Rallus limicola

• 

  †Ramoceros
  • †Ramoceros brevicornis – type locality for species
• †Rana
• †Ranellina
  • †Ranellina pilsbry – or unidentified related form
• Raninoides
  • †Raninoides slaki – type locality for species
• †Rapamys
  • †Rapamys fricki – type locality for species
• Rapana
  • †Rapana vaquerosensis
• †Rectoguembelina
  • †Rectoguembelina trinitatensis – or unidentified comparable form

• 

  Recurvirostra
• Reithrodontomys
• †Reithroparamys – or unidentified comparable form
• Reophax
  • †Reophax pilulifer – or unidentified comparable form
• †Repomys
  • †Repomys gustelyi – type locality for species
  • †Repomys maxumi – type locality for species
• Reticulitermes
  • †Reticulitermes laurae – type locality for species
  • †Reticulitermes tibalis
• Reticutriton
  • †Reticutriton elsmerensis
• †Retipirula
  • †Retipirula crassitesta

• 

  Retusa
  • †Retusa carinata
  • †Retusa culcitella
  • †Retusa harpa
  • †Retusa tantilla
• †Reynoldsomys
  • †Reynoldsomys timoteoensis – type locality for species
• †Rhabdammina
  • †Rhabdammina eocenica
• †Rhamnidium
  • †Rhamnidium chaneyi
• †Rhamnus
  • †Rhamnus calyptus
  • †Rhamnus moragensis
  • †Rhamnus plenus
  • †Rhamnus precalifornica
• †Rhomarchus – type locality for genus
  • †Rhomarchus ensiger – type locality for species
• †Rhomurus
  • †Rhomurus fulcratus
• Rhus
  • †Rhus diablana
  • †Rhus mixta

• 

  †Rhynchotherium
  • †Rhynchotherium falconeri
• †Rhynconella – tentative report
• †Rhyssomatus
  • †Rhyssomatus miocenae – type locality for species
• †Rhythmias
  • †Rhythmias gaviotae – type locality for species
  • †Rhythmias slarri
• Rimella
  • †Rimella macilentus
  • †Rimella supraplicata
  • †Rimella supraplicatus
• Rissa
  • †Rissa estesi – type locality for species
  • †Rissa tridactyla
• Rissoina
  • †Rissoina pleistocena

• 

  †Robinia
  • †Robinia californica
• Robulus
  • †Robulus alatolimbatus
  • †Robulus arcuatostriatus
  • †Robulus clericii
  • †Robulus clypeiformis – or unidentified comparable form
  • †Robulus inornatus
  • †Robulus insuetus
  • †Robulus kincaidi
  • †Robulus mayi
  • †Robulus mexicanus
  • †Robulus nikobarensis
  • †Robulus propinquus
  • †Robulus simplex
  • †Robulus terryi – or unidentified comparable form
  • †Robulus warmani
  • †Robulus welchi
• †Rogenio
  • †Rogenio bowersi
  • †Rogenio solitudinis
  • †Rogenio vanclevei – type locality for species
• †Rotularia
  • †Rotularia tejonense
• †Russellagus

• 

  Sabal
  • †Sabal miocenica
• †Sabalites
  • †Sabalites californicus
• Saccella
  • †Saccella alaeformis
  • †Saccella gabbi
  • †Saccella taphria
• Sagmatias
• †Sainguinolaria
  • †Sainguinolaria toulai – or unidentified comparable form
• Salix
  • †Salix boisiensis
  • †Salix edenensis
  • †Salix hesperia
  • †Salix ionensis
  • †Salix laevigatoides
  • †Salix pelviga
  • †Salix storeyana
  • †Salix wildcatensis
• †Salumiphocaena
  • †Salumiphocaena stocktoni – type locality for species

• 

  †Saniwa
  • †Saniwa ensidens – type locality for species
• †Sapindus
  • †Sapindus oklahomensis
• Saracenaria – tentative report
  • †Saracenaria acutiauricularis – or unidentified comparable form
• †Sarda
  • †Sarda stockii – type locality for species
• Sassia
  • †Sassia bilineata
• Saxidomus
  • †Saxidomus gigantea
  • †Saxidomus giganteus
  • †Saxidomus nuttalli
  • †Saxidomus vaquerosensis
• †Saxolucina

• 

  †Scaldicetus
  • †Scaldicetus grandis – or unidentified comparable form
• †Scalopoides
• Scapanus
  • †Scapanus latimanus
  • †Scapanus malatinus
  • †Scapanus shultzi – type locality for species
• Scaphander
  • †Scaphander costatus
  • †Scaphander jugularis
• Scapharca
  • †Scapharca obispoana
• Scaphinotus
  • †Scaphinotus interruptus

• 

  †Scaphohippus
  • †Scaphohippus intermontanus – type locality for species
  • †Scaphohippus sumani – type locality for species
• Sceloporus
  • †Sceloporus occidentalis
• †Scenopagus
  • †Scenopagus curtidens
  • †Scenopagus priscus – or unidentified comparable form
• †Schaubeumys
• †Schedocardia – tentative report
• †Schistomerus – type locality for genus
  • †Schistomerus californense – type locality for species
• Schizaster
  • †Schizaster diabloensis
  • †Schizaster lecontei
  • †Schizaster martinezensis
• †Schizodontomys
• †Sciuravus
  • †Sciuravus powayensis
• Sciurus
• Scomber
  • †Scomber sanctaemonicae
• †Scomberesox
  • †Scomberesox acutillus – type locality for species
  • †Scomberesox edwardsi – type locality for species

• 

  Scopelogadus
  • †Scopelogadus mizolepis
• †Scutella
  • †Scutella fairbanksi
  • †Scutella fairbanski
  • †Scutella merriami
  • †Scutella norrisi
  • †Scutella vaquerosensis
• †Scutellaster

• 

  Scyliorhinus
• †Scymnorhinus
  • †Scymnorhinus occidentalis
• Searlesia
  • †Searlesia dira
• †Sebastavus – type locality for genus
  • †Sebastavus vertebralis – type locality for species
• †Sebastodes
  • †Sebastodes apostates
  • †Sebastodes haroldi – type locality for species
  • †Sebastodes ineziae
  • †Sebastodes porteousi
  • †Sebastodes porteus
  • †Sebastodes rosae
• Seila
  • †Seila montereyensis
• Semelangulus
  • †Semelangulus tenuilirata
• Semele – tentative report
• Semele
  • †Semele decisa
  • †Semele diabloi
  • †Semele morani
  • †Semele packardi
  • †Semele pulchra
  • †Semele rubropicta
  • †Semele venusta
• Semicassis
  • †Semicassis louella – type locality for species
  • †Semicassis tuberculiformis
• Semicossyphus
• †Semirostrum – type locality for genus
  • †Semirostrum ceruttii – type locality for species
• Septifer
  • †Septifer bifurcatus

• 

  †Sequoiadendron
  • †Sequoiadendron chaneyi
• †Serbelodon
  • †Serbelodon burnhami
• Serica
  • †Serica kanakoffi – type locality for species
• Seriola
  • †Seriola sanctaebarbarae
• Seriphus
  • †Seriphus politus
• Serpula
  • †Serpula coreyi
• Serpulorbis
  • †Serpulorbis llajasensis
• †Sespedectes
  • †Sespedectes singularis – type locality for species
  • †Sespedectes stocki
• †Sespemys
  • †Sespemys thurstoni – type locality for species

• 

  †Sespia
  • †Sespia californica – type locality for species
  • †Sespia nitida
• Siderastrea
  • †Siderastrea clarki – type locality for species
  • †Siderastrea mendenhalli – type locality for species
• Sigmodon
  • †Sigmodon lindsayi
  • †Sigmodon minor
• Sigmoilina – tentative report
• Siliqua
  • †Siliqua lucida
  • †Siliqua media – or unidentified comparable form
  • †Siliqua patula – or unidentified related form
• †Simiacritomys
  • †Simiacritomys whistleri – type locality for species
• †Simidectes
  • †Simidectes medius – or unidentified comparable form
  • †Simidectes merriami – type locality for species
• †Simimeryx
  • †Simimeryx hudsoni – type locality for species
• †Simimys
  • †Simimys landeri – type locality for species
  • †Simimys simplex
• Simomactra
  • †Simomactra dolabriformis
  • †Simomactra falcata
  • †Simomactra planulata
• †Sinomactra
  • †Sinomactra falcata

• 

  Sinum
  • †Sinum debile – or unidentified comparable form
  • †Sinum obliquum
  • †Sinum scopulosum
• Siphonalia
  • †Siphonalia andersoni
  • †Siphonalia lineata
  • †Siphonalia merriami
  • †Siphonalia sutterensis – or unidentified comparable form
• Skenea
  • †Skenea californica
• †Smilax
  • †Smilax diforma
  • †Smilax labidurommae
  • †Smilax magna – or unidentified comparable form
  • †Smilax remingtonii

• 

  †Smilodon
  • †Smilodon fatalis
  • †Smilodon gracilis
• †Smilodonichthyes
  • †Smilodonichthyes rastrosus
• †Smilodonichthys
• †Smilodonicthyes
  • †Smilodonicthyes rastrosus
• †Smithites – type locality for genus
  • †Smithites elegans – type locality for species
• Solariella
  • †Solariella hartleyensis – type locality for species
  • †Solariella peramabilis
  • †Solariella walkeri – type locality for species

• 

  Solemya
  • †Solemya ventricosa
• Solen
  • †Solen curtis – or unidentified comparable form
  • †Solen rosaceus
  • †Solen sicarius
• Solena
  • †Solena conradi
  • †Solena gravidus
  • †Solena lorenzana
  • †Solena parallelus – or unidentified comparable form
  • †Solena perrini
  • †Solena stantoni
  • †Solena subverticala
• Solenastrea
  • †Solenastrea fairbanksi
• Solenosteira
  • †Solenosteira anomala

• 

  Sorex
  • †Sorex leahyi
• Spathipora
• Spermophilus
  • †Spermophilus argonautus
  • †Spermophilus beecheyi
  • †Spermophilus lateralis
• †Sphaeroidina
  • †Sphaeroidina gredalensis
• Sphenia – tentative report
  • †Sphenia meganosensis – type locality for species
• †Sphenophalos – tentative report

• 

  Sphyrna
  • †Sphyrna aus
  • †Sphyrna bus
• Spilogale
  • †Spilogale putorius
• †Spirocrypta
  • †Spirocrypta inornata
  • †Spirocrypta pileum
• Spiroglyphus
  • †Spiroglyphus lituella
  • †Spiroglyphus tinajasensis
• Spiroloculina
  • †Spiroloculina lamposa
• Spiroplectammina
  • †Spiroplectammina coreyi – type locality for species
  • †Spiroplectammina eocenica
  • †Spiroplectammina kewi – type locality for species
• Spirotropis
  • †Spirotropis bulimoides
  • †Spirotropis perversa

• 

  Spisula
  • †Spisula coosensis
  • †Spisula densatum – type locality for species
  • †Spisula meganosensis – type locality for species
  • †Spisula pabloensis
  • †Spisula packardi
  • †Spisula panzanum
• Spondylus
  • †Spondylus bostrychites
  • †Spondylus calcifer
  • †Spondylus carlosensis
  • †Spondylus perrini
  • †Spondylus vaquerosensis

• 

  Squalus
  • †Squalus sericulus
  • †Squalus serriculus
• Squatina
  • †Squatina californica – or unidentified comparable form
  • †Squatina claifornica
  • †Squatina lerichei
• Squilla
  • †Squilla laingae
• †Starrias – type locality for genus
  • †Starrias ischyrus – type locality for species

• 

  †Stegomastodon
  • †Stegomastodon mirificus – or unidentified comparable form
• Stenella
• †Stenomylus
  • †Stenomylus hitchcocki – or unidentified comparable form
• Stenoplax
  • †Stenoplax conspicua
  • †Stenoplax magdalenensis
• Stephanodiscus
  • †Stephanodiscus asteroides
  • †Stephanodiscus carconensis
  • †Stephanodiscus excentricus
  • †Stephanodiscus hantzchii
  • †Stephanodiscus hantzschii
• †Stephanophyllia
  • †Stephanophyllia californica – type locality for species
  • †Stephanophyllia vacavillensis
• Stercorarius
• Sterna
  • †Sterna neglecta
• †Sternbergia – type locality for genus
  • †Sternbergia waitei – type locality for species
• Sthenictis
• †Stichocassidulina
  • †Stichocassidulina thalmanni
• †Stictocarbo
  • †Stictocarbo kumeyaay – type locality for species
• †Stockia – type locality for genus
  • †Stockia powayensis – type locality for species

• 

  †Stockoceros – or unidentified comparable form
• Stomias
  • †Stomias affinis
• Stramonita
  • †Stramonita biserialis
  • †Stramonita canaliculata
  • †Stramonita imperialis
• †Strepsidura
  • †Strepsidura diabloensis – type locality for species
  • †Strepsidura ficus – tentative report
  • †Strepsidura lincolnensis
• †Streptochetus
  • †Streptochetus californiana – type locality for species

• 

  †Striatolamia
  • †Striatolamia macrota
• †Striostrea
  • †Striostrea freudenbergi
• Strioterebrum
  • †Strioterebrum gausapatum
• †Strobilites
  • †Strobilites temblorensis
• Strombiformis
  • †Strombiformis raymondi
• Strombus
  • †Strombus galeatus
  • †Strombus gracilior
• †Strongyliscus – type locality for genus
  • †Strongyliscus robustus – type locality for species
• Strongylocentrotus
• †Strongylodon
  • †Strongylodon falcata
• Strophocardia
  • †Strophocardia megastropha
• Sturnella
  • †Sturnella negecta
• †Stylemys
  • †Stylemys neglectus – type locality for species
• Subcancilla
  • †Subcancilla sulcata

• 

  †Subhyracodon
  • †Subhyracodon kewi
• Succinea
• †Suggrunda
• Sula
  • †Sula clarki – type locality for species
  • †Sula pohli – type locality for species
  • †Sula willetti – type locality for species
• †Sulcocypraea
  • †Sulcocypraea moumieti
• Sulcoretusa
  • †Sulcoretusa xystrum
• Surculites
  • †Surculites aequilateralis
  • †Surculites carpentaria
  • †Surculites carpenteriana
  • †Surculites carpenterianus
  • †Surculites isoformis
  • †Surculites keepi – or unidentified comparable form
  • †Surculites mathewsoni
  • †Surculites mathewsonii
  • †Surculites remondi
  • †Surculites remondii
• †Surculities – tentative report
• †Syllomus – or unidentified comparable form
  • †Syllomus aegyptiacus
• Sylvilagus
  • †Sylvilagus audubonii
  • †Sylvilagus bachmani
  • †Sylvilagus floridanus
  • †Sylvilagus hibbardi
• Syncera
  • †Syncera translucens

• 

  Syngnathus
  • †Syngnathus avus – type locality for species
• †Synthiboramphus
  • †Synthiboramphus antiquus
• Synthliboramphus
  • †Synthliboramphus antiquus
  • †Synthliboramphus hypoleucas
  • †Synthliboramphus hypoleucus
  • †Synthliboramphus rineyi – type locality for species
• †Synthliboraramphus
  • †Synthliboraramphus antiquus

• 

  †Tabernaemontana
  • †Tabernaemontana chrysophylloides
• Tadorna
  • †Tadorna tadorna
• Tagelus
  • †Tagelus affinis
  • †Tagelus californianus
  • †Tagelus clarki – type locality for species
  • †Tagelus subteres
• Tamias
  • †Tamias ateles – type locality for species
• Tamiasciurus
  • †Tamiasciurus hudsonicus
• Tamiosoma
  • †Tamiosoma gregaria – type locality for species
• †Tanymykter
  • †Tanymykter brachyodontus
• Tapirus
  • †Tapirus californicus
  • †Tapirus haysii
  • †Tapirus merriami – type locality for species
• †Tapochoerus
  • †Tapochoerus egressus – type locality for species
  • †Tapochoerus mcmillini – type locality for species

• 

  †Tapocyon
  • †Tapocyon dawsonae – type locality for species
  • †Tapocyon robustus
• †Tapomys
  • †Tapomys tapensis
• Taranis
  • †Taranis incultus
• Taricha
• Taxidea
  • †Taxidea taxus
• Tayassu
  • †Tayassu edensis
• Tegula
  • †Tegula – type locality for species informal
  • †Tegula aureotincta
  • †Tegula eiseni
  • †Tegula ligulata
• †Tejonia
  • †Tejonia lajollaensis – or unidentified comparable form

• 

  †Teleoceras
  • †Teleoceras fossiger
  • †Teleoceras hicksi
  • †Teleoceras mediocronutum
  • †Teleoceras meridianum
• †Teletaceras
  • †Teletaceras mortivallis

• 

  Tellina
  • †Tellina bodegensis
  • †Tellina cowlitzensis – or unidentified related form
  • †Tellina emacerata
  • †Tellina eugenia
  • †Tellina idae
  • †Tellina kewi
  • †Tellina lebecki – or unidentified comparable form
  • †Tellina martinezensis
  • †Tellina meropsis
  • †Tellina nuculoides
  • †Tellina ocoyana
  • †Tellina oldroydi
  • †Tellina oregonensis
  • †Tellina piercei
  • †Tellina pittsburgensis
  • †Tellina remondii
  • †Tellina soledadensis – or unidentified comparable form
  • †Tellina tehachapi
  • †Tellina undulifera
  • †Tellina vancouverensis – or unidentified comparable form
  • †Tellina wilsoni
• †Temnocyon
  • †Temnocyon subferox – or unidentified comparable form
• Tenagodus
  • †Tenagodus californiensis
• †Tenudomys
  • †Tenudomys bodei

• 

  †Teratornis
  • †Teratornis merriami
• Terebellum
• Terebra
  • †Terebra albocincta
  • †Terebra californica
  • †Terebra danai
  • †Terebra pedroana
  • †Terebra protexta
  • †Terebra santana – type locality for species
• Terebratalia
  • †Terebratalia batequia – or unidentified related form

• 

  Terebratula
• Terebratulina
  • †Terebratulina tejonensis
  • †Terebratulina tejonensis waringi
• Teredo
• Terminalia
  • †Terminalia estamina
• †Tessarolax – tentative report
  • †Tessarolax inconspicua
• Testudo
• †Testudoolithus – or unidentified comparable form
• †Tetraclaenodon
  • †Tetraclaenodon puercensis
• Tetraclita
• †Tetrameryx
  • †Tetrameryx irvingtonensis – type locality for species
• †Texoceros
  • †Texoceros altidens – or unidentified comparable form
  • †Texoceros edensis – type locality for species
• Thais
  • †Thais carrizoensis
  • †Thais lamellosa
  • †Thais packi

• 

  †Thalassoleon
  • †Thalassoleon macnallyae – type locality for species
  • †Thalassoleon mexicanus
• †Thamnasteria
  • †Thamnasteria sinuata – type locality for species
• Thamnophis
• Thanatophilus
  • †Thanatophilus lapponicus
• †Thelyphonus
  • †Thelyphonus hadleyi – type locality for species
• Thomomys
  • †Thomomys bottae
  • †Thomomys gidleyi
  • †Thomomys leucodon
  • †Thomomys microdon – type locality for species
  • †Thomomys monticola
• †Thouinopsis
  • †Thouinopsis myricaefolia
• Thracia
  • †Thracia pedroana
  • †Thracia sorrentoensis – or unidentified comparable form
  • †Thracia undulata
• Thunnus – type locality for genus
  • †Thunnus starksi – type locality for species
• Thyasira
  • †Thyasira folgeri
• †Thyrsites
  • †Thyrsites kriegeri – type locality for species
• †Ticholeptus
  • †Ticholeptus zygomaticus
• Timoclea
  • †Timoclea picta
• Tinosaurus
  • †Tinosaurus stenodon – or unidentified comparable form
• †Tiphyocetus – type locality for genus
  • †Tiphyocetus temblorensis – type locality for species

• 

  †Titanotylopus
• Tivela
  • †Tivela diabloensis
  • †Tivela gabbi
  • †Tivela inezana
  • †Tivela kelloggensis
  • †Tivela stultorum
• †Tomarctus
  • †Tomarctus brevirostris
  • †Tomarctus hippophaga
  • †Tomarctus hippophagus – or unidentified comparable form
• †Topangasquilla
  • †Topangasquilla gravesi
• Torcula
  • †Torcula inezana
• †Tornatellaea
  • †Tornatellaea pinguis
• Totanus

• 

  †Toxicodendron
  • †Toxicodendron franciscana
• Toxopneustes
  • †Toxopneustes roseus – or unidentified comparable form
• Toxostoma
  • †Toxostoma redivivum
• Trachycardium
  • †Trachycardium procerum
  • †Trachycardium schencki
  • †Trachycardium vaquerosensis
  • †Trachycardium woodringi – type locality for species
• Transennella
  • †Transennella joaquinensis – or unidentified comparable form

• 

  Tremarctos
  • †Tremarctos floridanus
• Tresus
  • †Tresus capax
  • †Tresus nuttallii
  • †Tresus pajaroanus
• Triakis – tentative report
• Trichotropis
  • †Trichotropis cancellata
  • †Trichotropis insignis – or unidentified comparable form
• Tricolia
  • †Tricolia compta
  • †Tricolia pulloides
• †Trigonictis
  • †Trigonictis macrodon
• Trionyx
• Triphora
  • †Triphora pedroana

• 

  Triplofusus
  • †Triplofusus princeps
• †Triplopus – tentative report
  • †Triplopus woodi – type locality for species
• Trochammina
  • †Trochammina albertensis
  • †Trochammina palea – type locality for species
• Trochita
  • †Trochita filosa
• Trochocyathus
  • †Trochocyathus crooki
  • †Trochocyathus durhami – type locality for species
  • †Trochocyathus grahami – type locality for species
  • †Trochocyathus imperialis – type locality for species
  • †Trochocyathus nomlandi – type locality for species
  • †Trochocyathus stantoni – type locality for species
• †Trogomys
  • †Trogomys rupinimenthae – type locality for species
• †Trogosus
• Trophon
  • †Trophon carisaensis – or unidentified comparable form
  • †Trophon eucymata
  • †Trophon fleenerensis
  • †Trophon gillulyi
  • †Trophon hernensis – or unidentified comparable form
  • †Trophon kernensis
  • †Trophon multicostatus
  • †Trophon pacificus
• †Trossulus – tentative report
  • †Trossulus exoletus
• †Trypanotoma
  • †Trypanotoma stocki
• †Tubulodon – or unidentified comparable form
• †Tubulostium – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Tubulostium tejonensis

• 

  Tucetona
  • †Tucetona multicostata
• Tudicla
  • †Tudicla blakei
• †Tunita – type locality for genus
  • †Tunita octavia – type locality for species
• †Turbinolia
  • †Turbinolia capayasensis – type locality for species
  • †Turbinolia clarki – type locality for species
  • †Turbinolia dickersoni – type locality for species
  • †Turbinolia imbulata
  • †Turbinolia pusillanima – type locality for species
• Turbonilla
  • †Turbonilla aepynota
  • †Turbonilla almo
  • †Turbonilla asser
  • †Turbonilla canfieldi
  • †Turbonilla carpenteri
  • †Turbonilla keepi

  • 

    †Turbonilla laminata
  • †Turbonilla lowei
  • †Turbonilla marshensis – type locality for species
  • †Turbonilla pedroana
  • †Turbonilla pentalopha
  • †Turbonilla raymondi
  • †Turbonilla regina
  • †Turbonilla stylina
  • †Turbonilla tenuicula
  • †Turbonilla torquata
  • †Turbonilla tridentata
  • †Turbonilla weldi
• Turcica
  • †Turcica caffea
• Turdus
• †Turio
  • †Turio culveri – type locality for species
• Turricula
  • †Turricula cooperi
  • †Turricula merriami
  • †Turricula praeattenuata – or unidentified comparable form
  • †Turricula waringi
• Turris
  • †Turris fresnoensis
  • †Turris perissolaxoides

• 

  Turritella
  • †Turritella andersoni
  • †Turritella bosei
  • †Turritella bulwaldana
  • †Turritella buwaldana
  • †Turritella carisaensis
  • †Turritella carrisaensis
  • †Turritella cooperi
  • †Turritella hendoni
  • †Turritella imperialis – type locality for species
  • †Turritella inezana
  • †Turritella inezani
  • †Turritella infragranulata
  • †Turritella lajollaensis – or unidentified comparable form
  • †Turritella lawsoni
  • †Turritella lorenzana – type locality for species
  • †Turritella mariana
  • †Turritella meganosensis – type locality for species
  • †Turritella merriami
  • †Turritella ocoyana
  • †Turritella pachecoensis
  • †Turritella reversa
  • †Turritella stocki
  • †Turritella temblorensis
  • †Turritella uvasana
  • †Turritella variata
  • †Turritella wittichi
• Turritriton
  • †Turritriton gibbosus

• 

  Tursiops – or unidentified comparable form
• Typha
  • †Typha lesquereuxii
• Typhis
• Tyto
  • †Tyto alba

• Uca
  • †Uca hamlini
• †Uintasorex
  • †Uintasorex montezumicus – type locality for species

• 

  †Uintatherium
• Ulmus
  • †Ulmus affinis
• †Umbellularia
  • †Umbellularia salicifolia
• †Umpquaia
• Uria
  • †Uria aalgae

  • 

    †Uria aalge
  • †Uria algae
  • †Uria brodkorbi – type locality for species
  • †Uria paleohesperis – type locality for species
• †Uriscus
  • †Uriscus californicus
• †Urobatis
  • †Urobatis halleri
• †Urocitellus
  • †Urocitellus beldingi
• Urocyon
  • †Urocyon californicus
  • †Urocyon cinereoargenteus
  • †Urocyon galushai
• Urolophus
  • †Urolophus halleri – tentative report
• Ursus

  • 

    †Ursus americanus
• †Ustatochoerus
  • †Ustatochoerus major
• Uta
  • †Uta stansburiana
• Uvigerina
  • †Uvigerina garzaensis
• †Uvigerinella
  • †Uvigerinella obesa

• †Valenictus – type locality for genus
  • †Valenictus chulavistensis – type locality for species
  • †Valenictus imperialensis – type locality for species
• Valvulineria
  • †Valvulineria californica
  • †Valvulineria casitasensis
  • †Valvulineria tumeyensis
  • †Valvulineria wilcoxensis – or unidentified comparable form
• †Vanderhoofius
  • †Vanderhoofius coalingensis
• †Vaquerosella
  • †Vaquerosella andersoni
  • †Vaquerosella coreyi
  • †Vaquerosella durhami
  • †Vaquerosella fairbanksi
  • †Vaquerosella merriami
  • †Vaquerosella vaquerosensis
• Vasum
  • †Vasum caestum
• †Vauquelinia
  • †Vauquelinia exigua – type locality for species

• 

  †Velates
  • †Velates californicus – type locality for species
  • †Velates perversus
• Velutina
  • †Velutina velutina
• Venericardia
  • †Venericardia hornii
  • †Venericardia mulleri
  • †Venericardia planicosta
  • †Venericardia sandiegoensis
• Venus
  • †Venus purpurissata
• Vermicularia
  • †Vermicularia ebunea
• Veromessor
  • †Veromessor andrei
• †Vertipecten
  • †Vertipecten alexclarki – type locality for species
  • †Vertipecten nevadanus
  • †Vertipecten perrini
  • †Vertipecten yneziana – or unidentified related form
• †Viburnum
  • †Viburnum variabilis

• 

  †Vireo
• †Virgulina
  • †Virgulina bramlettei
  • †Virgulina bramlettrei
  • †Virgulina dibollensis
• Vitrinella – tentative report
• Volsella
  • †Volsella merriami
  • †Volsella porterensis – or unidentified comparable form

• 

  Voluta
• †Volutilithes
  • †Volutilithes orocopiaensis – type locality for species
• Volutopsius
  • †Volutopsius eurekaensis
• Volvulella
  • †Volvulella cylindrica
• †Vouapa
  • †Vouapa geminifolia – type locality for species
• Vulpes
  • †Vulpes cascadensis
  • †Vulpes kernensis – type locality for species
  • †Vulpes stenognathus
  • †Vulpes velox
• Vulvulina
  • †Vulvulina curta

• †Washakius
  • †Washakius woodringi – type locality for species
• †Whitneyella
  • †Whitneyella sinuata
• Williamia
  • †Williamia peltoides

• 

  †Wodnika
  • †Wodnika ocoyae – type locality for species
• †Woodburnehyus – type locality for genus
  • †Woodburnehyus grenaderae – type locality for species

• 

  Xenophora
  • †Xenophora stocki
  • †Xenophora zitteli
• †Xenothrissa – type locality for genus
  • †Xenothrissa aphrasta – type locality for species
• †Xyne – type locality for genus
  • †Xyne grex – type locality for species
• †Xyrinius – type locality for genus
  • †Xyrinius houshi – type locality for species

• †Yaquius
  • †Yaquius travisi
• †Yatkolamys
• Yoldia
  • †Yoldia cooperii
  • †Yoldia impressa
  • †Yoldia mortuasusensis – type locality for species
  • †Yoldia packardi – or unidentified comparable form
  • †Yoldia scissurata
  • †Yoldia tenuissima
• †Yumaceras – tentative report
  • †Yumaceras ruminalis – type locality for species

• †Zachrysia
  • †Zachrysia fraterna – type locality for species
• Zalophus
  • †Zalophus californianus

• 

  †Zamites
  • †Zamites californica
• †Zanteclites – type locality for genus
  • †Zanteclites hubbsi – type locality for species
• †Zaphleges
  • †Zaphleges longurio
• †Zapteryx
  • †Zapteryx californicus – or unidentified comparable form
• †Zarhinocetus
  • †Zarhinocetus errabundus – type locality for species
• Zelkova
  • †Zelkova oregoniana
• Zenaida
  • †Zenaida macroura
• Zirfaea
  • †Zirfaea dentata – or unidentified comparable form
  • †Zirfaea pilsbryi
• Zonotrichia
  • †Zonotrichia leucophrys

• 

  †Zygolophodon

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on March 25, 2022. Retrieved December 17, 2021.