List of the prehistoric life of California

This list of the prehistoric life of California contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of California.

Precambrian
The Paleobiology Database records no known occurrences of Precambrian fossils in California.

Selected Paleozoic taxa of California

 * †Advenella
 * †Agathiceras
 * †Ampyx – tentative report
 * †Ampyx
 * †Apatolichas
 * Aspidella surface.jpg †[[Aspidella]] – tentative report
 * †Aspidella terranovica
 * †Atrypa
 * †Atrypa reticularis
 * †Aviculopecten
 * †Aviculopecten occidentalis – or unidentified comparable form
 * †Bimuria
 * †Bolbolenellus
 * †Bristolia
 * †Bumastus
 * †Calymene
 * †Camarotoechia – tentative report
 * †Carolinites
 * †Chonetes
 * †Cleiothyridina
 * †Composita
 * †Composita grandis – or unidentified comparable form
 * †Composita subtilita – or unidentified comparable form
 * †Conchidium
 * †Conocardium
 * Cruziana Brallier Harrell Devonian.jpg †[[Cruziana]]
 * †Cyclolobus
 * †Cyclonema
 * †Cymbidium
 * †Daguinaspis
 * †Dicoelosia
 * †Didymograptus
 * †Dimeropygiella
 * †Diplichnites
 * †Encrinurus
 * †Endoceras – tentative report
 * †Euomphalus
 * †Fallotaspis
 * †Favosites
 * †Fenestella
 * †Gogia
 * †Halysites
 * †Helicoplacus
 * Helicoprion bessonovi cropped.png †[[Helicoprion]]
 * †Helicoprion davisii
 * †Heliomeroides
 * †Hercynella
 * †Holopea
 * †Hyolithes
 * †Illaenus
 * †Ingria
 * †Isogramma
 * †Isotelus
 * †Kawina
 * Kutorgina cingulata.png †[[Kutorgina]]
 * †Lingula
 * †Lingulella
 * †Lithostrotion
 * †Lithostrotion pauciradiale
 * †Lonchodomas
 * †Meristella
 * †Micromitra
 * †Murchisonia
 * †Neospirifer
 * †Nephrolenellus
 * †Nevadella
 * †Obolella
 * Olenellus-fowleri.jpg †[[Olenellus]]
 * †Olenellus fowleri – or unidentified comparable form
 * †Oryctocephalus
 * †Oryctocephalus indicus
 * †Paladin
 * Palaeoaplysina
 * †Paleochiton
 * †Parafusulina
 * †Paraschwagerina
 * †Peachella
 * PentamerusSilurian.jpg †[[Pentamerus]]
 * †Phillipsia
 * †Phyllograptus
 * †Plaesiomys
 * †Planolites
 * †Platyceras
 * †Poleumita
 * †Proetus
 * †Pteridinium – tentative report
 * †Raymondaspis
 * †Remopleurides
 * †Repinaella
 * RusophycusOrdovician.jpg †[[Rusophycus]]
 * †Schwagerina
 * †Skenidioides
 * †Spirifer
 * †Spirifer brazerianus
 * †Spiriferina – tentative report
 * †Stearoceras
 * †Streptosolen
 * †Stylonema
 * †Swartpuntia – or unidentified comparable form
 * †Syringopora
 * †Thompsonella
 * †Trinodus
 * †Trocholites – tentative report
 * †Volborthella
 * †Wanneria
 * Xenodiscus besairiei.JPG †[[Xenodiscus]]
 * †Zacanthoides

Selected Mesozoic taxa of California

 * †Abyssochrysos – tentative report
 * †Acanthoceras
 * Acanthosphaera – tentative report
 * Acesta
 * †Acrioceras
 * †Acrodus
 * †Acrodus wempliae – type locality for species
 * †Acteon
 * †Acteonella
 * Aletopelta coombsi.jpg †[[Aletopelta]] – type locality for genus
 * †Aletopelta coombsi – type locality for species
 * Amauropsis
 * †Ampullina
 * †Anagaudryceras
 * †Anagaudryceras sacya – or unidentified comparable form
 * †Anahamulina
 * †Anasibirites
 * †Anasibirites kingianus – type locality for species
 * †Anatomites
 * †Anatropites
 * †Anisoceras
 * Anomia ephippium.jpg †[[Anomia (genus)|Anomia]]
 * †Anoplophora – tentative report
 * †Aphaea
 * †Aphrosaurus
 * †Aphrosaurus furlongi
 * Aporrhais
 * Architectonica – tentative report
 * Arctica
 * †Arctoceras
 * Argyrotheca
 * †Arnioceras
 * †Arpadites
 * Arrhoges
 * †Aspenites – type locality for genus
 * Astarte
 * †Asteroceras
 * †Atira
 * Saurolophus morrisi.jpg †[[Augustynolophus]]
 * †Augustynolophus morrisi
 * †Axonoceras
 * †Bacchites
 * †Baculites
 * †Baculites capensis
 * †Baculites yokoyamai – or unidentified comparable form
 * Barbatia
 * †Barrettia
 * †Basilemys
 * † Belleza
 * Bernaya
 * †Beudanticeras
 * †Bochianites
 * †Bostrychoceras
 * †Brancoceras
 * Bulimulus
 * Bullaria
 * Bullina
 * †Californites – type locality for genus
 * Californosaurus BW.jpg †[[Californosaurus]]
 * Callianassa – tentative report
 * †Calliconites
 * †Calliomphalus – tentative report
 * Callista – tentative report
 * †Calva
 * †Calycoceras
 * Cancellaria – tentative report
 * Cantharus
 * Capulus – or unidentified comparable form
 * Cardinia
 * Cardita
 * †Cecrops
 * Cerithidea
 * Cerithium
 * †Cidarina
 * Cidaris cidaris MHNT.jpg [[Cidaris]]
 * †Clinura
 * †Collignoniceras
 * †Collonia
 * Corbicula
 * Corbula
 * Cornutella
 * †Cosmonautilus
 * †Crioceratites
 * Cucullaea
 * †Cunningtoniceras
 * †Cyclothyris
 * Cylichna
 * †Cylindroteuthis
 * †Cymatoceras
 * Cymboscale.png †[[Cymbospondylus]]
 * †Cymbospondylus petrinus
 * †Daonella – tentative report
 * †Daonella dubia
 * †Dentalium
 * †Desmoceras
 * †Desmophyllites
 * †Dictyoconites
 * †Didymoceras
 * †Didymoceras hornbyense – or unidentified comparable form
 * †Dieneria – type locality for genus
 * †Discohelix – tentative report
 * †Discoscaphites
 * †Douvilleiceras
 * †Durania
 * †Echinocorys
 * †Elimia
 * Enchodus petrosus cropped.png †[[Enchodus]]
 * †Entobia
 * †Eriphyla
 * †Eucalycoceras
 * †Euclastes
 * †Euomphaloceras
 * †Eupachydiscus
 * †Euspira
 * †Eutrephoceras
 * †Exiteloceras
 * †Exogyra
 * Fagesia spheroidalis.jpg †[[Fagesia]]
 * Fissurella – tentative report
 * †Flabellina
 * †Flabellum
 * †Fresnosaurus – type locality for genus
 * †Fresnosaurus drescheri – type locality for species
 * Gastrochaena – tentative report
 * †Gaudryceras
 * †Gervillia
 * Glans – tentative report
 * †Glauconia
 * †Globigerinelloides
 * Glossus
 * Glycymeris
 * †Goricanites – type locality for genus
 * Grallator.jpg †[[Grallator]]
 * †Gryphaea
 * †Gryponautilus
 * Gyroidina
 * Haliotis
 * †Hauericeras
 * †Hecticoceras
 * †Hedenstroemia
 * †Helena
 * †Hemicidaris
 * Heptranchias
 * Hipponix
 * †Homerites
 * †Hybodus
 * †Hydrotherosaurus – type locality for genus
 * †Hydrotherosaurus alexandrae – type locality for species
 * †Hypophylloceras
 * †Ichthyornis
 * †Ichthyosaurus
 * Inoceramus steenstrup, world's largest fossil mollusk.jpg †[[Inoceramus]]
 * †Inoceramus balticus
 * †Inoceramus cordiformis – or unidentified comparable form
 * †Inoceramus incertus – or unidentified comparable form
 * †Inoceramus naumanni
 * †Inoceramus steinmanni – or unidentified comparable form
 * †Inoceramus subundatus
 * †Inoceramus teshioensis – or unidentified comparable form
 * †Inoceramus turgidus – type locality for species
 * †Inyoites – type locality for genus
 * †Inyoites oweni – type locality for species
 * Isognomon
 * Tetrarhynchiidae - Kallirhynchia major.JPG †[[Kallirhynchia]]
 * †Kilianella
 * †Kossmaticeras
 * †Lacunaria
 * Leda – tentative report
 * Lima
 * †Linearis
 * †Lingula
 * Lithophaga
 * Lopha
 * †Loxo
 * †Lucina
 * †Lysis
 * †Lytoceras
 * †Lytoceras batesi
 * Macrocallista
 * †Macrocephalites
 * †Mammites – tentative report
 * †Mantelliceras
 * Margarella
 * Margarites
 * Mariella lewesiensis.jpg †[[Mariella]]
 * Martesia
 * †Mediaster
 * †Meekoceras
 * †Meekoceras gracilitatis
 * †Melchiorites
 * †Menuites
 * †Merriamia
 * † Mita – tentative report
 * † Mita
 * †Modiolus
 * †Morenosaurus – type locality for genus
 * †Morenosaurus stocki – type locality for species
 * †Mortoniceras
 * Musculus – or unidentified related form
 * †Myophorella
 * †Myophorella argo
 * †Myophorella dawsoni – or unidentified related form
 * †Myophorella yellowstonensis
 * †Myophoria
 * †Mytilus
 * Natica
 * †Navahopus
 * Thalattosauridae.jpg †[[Nectosaurus]]
 * †Neithea
 * †Neocardioceras – tentative report
 * †Neohibolites
 * †Neophylloceras
 * †Neophylloceras hetonaiense
 * †Neophylloceras ramosum
 * †Nerinea
 * Nerita
 * †Nolita
 * †Nostoceras
 * †Nostoceras splendidum
 * Nucula
 * Opalia
 * †Ophiceras
 * †Opis
 * †Orthoceras
 * Oyster.jpg [[Ostrea]]
 * †Owenites
 * †Owenites carpenteri
 * †Owenites koeneni – type locality for species
 * †Oxynautilus
 * †Oxytoma
 * †Pachydesmoceras
 * †Pachydesmoceras pachydiscoide – type locality for species
 * †Pachydiscus
 * †Pachydiscus ootacodensis
 * Panopea
 * Parapuzosia seppenradensis 3.jpg †[[Parapuzosia]]
 * Patella – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Pecten
 * †Pedalion
 * †Pentzia
 * †Peroniceras
 * Phanerolepida
 * Pholadomya
 * †Phylloceras
 * †Phyllopachyceras
 * †Pinna
 * †Plesiotylosaurus
 * †Plesiotylosaurus crassidens
 * Plicatula
 * Plotosaurus NT small cropped.png †[[Plotosaurus]]
 * †Plotosaurus bennisoni
 * †Plotosaurus tuckeri
 * Polinices
 * †Polycyclus
 * †Polyptychites
 * †Polyptychoceras
 * †Posidonia
 * †Potamides – tentative report
 * †Proclydonautilus
 * †Prognathodon
 * †Prognathodon waiparaensis – or unidentified comparable form
 * Propeamussiidae - Propeamussium eocenicum.JPG [[Propeamussium]]
 * †Protocardia
 * †Protrachyceras
 * †Pseudomelania
 * †Pseudoperna
 * †Pseudothurmannia – tentative report
 * †Pteraichnus
 * †Pterotrigonia
 * †Puzosia
 * Pycnodonte
 * Quadrans – tentative report
 * Retusa
 * †Rhaetina – tentative report
 * †Rhynchonella
 * Rogerella
 * †Romaniceras
 * †Scalarites
 * †Scapanorhynchus
 * Scaphander
 * †Scaphites
 * †Scaphites hippocrepis – or unidentified related form
 * †Senis
 * Del Norte Titan 230 cropped.jpg †[[Sequoia (genus)|Sequoia]]
 * Serpula
 * †Shastasaurus
 * †Shastasaurus alexandrae
 * †Shastasaurus pacificus
 * †Shastoceras
 * Siphonalia
 * †Sirenites
 * †Skolithos
 * Solariella
 * Solemya – tentative report
 * Solen
 * †Spiriferina – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Spiriferina coreyi – type locality for species
 * Spondylus
 * Squalicorax
 * †Sturia
 * † Suna
 * †Tegula
 * Tellina
 * †Tenea
 * Terebralia – tentative report
 * †Tessarolax
 * Thalattosaurus alexandrae Merriam cropped.jpg †[[Thalattosaurus]]
 * Thyasira
 * †Tollia
 * †Tragodesmoceras
 * †Trigonia
 * †Trinacria
 * †Trochactaeon
 * Trophon
 * †Turrilites
 * †Turrilites acutus
 * †Turrilites costatus – or unidentified comparable form
 * Turritella
 * Volsella
 * †Worthenia
 * †Wyomingites
 * †Yezoites
 * Yoldia limatula illustration.png, or file yoldia]] Yoldia''
 * †Zanola
 * †Zealandites

Selected Cenozoic taxa of California

 * †Abantis
 * Red fir.jpg [[Abies]]
 * †Aboma
 * †Acalypha
 * Acanthina
 * †Acanthina spirata
 * Acanthocardia
 * Acar
 * Accipiter
 * †Accipiter velox
 * Acentrophryne
 * Acer
 * Acesta
 * Acipenser
 * †Acipenser medirostris – or unidentified comparable form
 * Acmaea
 * †Acmaea mitra
 * Acritohippus isonesus.jpg †[[Acritohippus]]
 * †Acritohippus isonesus – or unidentified comparable form
 * Acteocina
 * Acteon
 * Actinemys
 * †Actinemys marmorata
 * Admete
 * †Admete rhyssa
 * Adula
 * Aechmophorus
 * †Aechmophorus occidentalis
 * †Aelurodon
 * Aepycamelus Alticamelus hharder.jpg †[[Aepycamelus]]
 * †Aepycamelus alexandrae
 * Aequipecten
 * Aesopus
 * Aethia
 * Agaronia
 * Agelaius
 * †Agriotherium
 * †Ailanthus
 * Akera
 * Alaba
 * Alabina
 * †Albicetus
 * Alca
 * †Alcodes
 * Aleochara
 * Aletes
 * †Aletomeryx
 * †Alforjas
 * †Alisea – type locality for genus
 * †Allodelphis – type locality for genus
 * †Allodelphis pratti – type locality for species
 * Skeleton of Allodesmus.jpg Allodesmus]] †Allodesmus
 * †Allodesmus kernensis
 * Alnus
 * †Alopecocyon – type locality for genus
 * Alopias
 * †Alopias vulpinus – or unidentified comparable form
 * Alvania
 * Amara
 * †Amara insignis
 * Amauropsis
 * Amelanchier
 * Ammospermophilus
 * †Amorpha
 * †Amphicyon
 * †Amphicyon ingens
 * Machairodus giganteus 1.jpg †[[Amphimachairodus]]
 * Amphissa
 * †Amphissa versicolor
 * Amphiura
 * †Amphora
 * †Ampullina
 * Amusium
 * Anachis
 * Anadara
 * Anas
 * †Anas americana
 * †Anas clypeata
 * †Anas platyrhynchos
 * †Anchitheriomys – or unidentified comparable form
 * Anchitherium - mandibles - Somosaguas cropped.jpg †[[Anchitherium]]
 * Ancilla
 * Angulus
 * Anniella
 * Anodontia
 * Anomia
 * †Ansen
 * Anser
 * †Anser albifrons
 * Antigona
 * †Antilla
 * Antilocapra
 * Antrozous
 * †Antrozous pallidus
 * Aphelocoma
 * †Aphelocoma californica
 * Aphelops.jpg †[[Aphelops]]
 * Apiotoma
 * Aplodontia
 * †Aplodontia rufa
 * Aquila
 * †Aquila chrysaetos
 * †Araeosteus
 * †Araeosteus rothi
 * Arbutus
 * Arca
 * †Arceuthobium
 * †Archaeocyon
 * †Archaeohippus
 * Architectonica
 * Archoplites
 * †Archoplites interruptus
 * Arcinella
 * Arctica – tentative report
 * Arctocephalus
 * ArctodusSimusReconstruct.jpg †[[Arctodus]]
 * †Arctodus simus – type locality for species
 * †Arctostaphylos
 * Ardea
 * †Ardea herodias
 * Arenaria
 * †Arenaria melanocephala
 * Arene
 * †Argenna
 * Argobuccinum
 * Argopecten
 * Calico scallop 02.jpg †[[Argopecten gibbus]]
 * †Argopecten purpuratus
 * Argyropelecus
 * †Artocarpus
 * Asio
 * †Asio wilsonianus
 * Astraea
 * †Astraea undosa
 * Astrangia
 * Astropecten
 * Astyris
 * Athene
 * †Athene cunicularia
 * Athleta
 * †Atocetus
 * †Atocetus nasalis – type locality for species
 * Atrina
 * †Aturia
 * Atys
 * Aulophyseter BW.jpg †[[Aulophyseter]] – type locality for genus
 * Austrotrophon
 * †Avipeda
 * Aythya
 * †Aythya affinis
 * †Aythya valisineria
 * Baiomys
 * Balaenoptera
 * †Balaenoptera physalus
 * †Balaenoptera ryani
 * Balaenula balaenopsis.jpg †[[Balaenula]]
 * Balanophyllia
 * †Balanophyllia elegans
 * Balanus
 * †Balanus crenatus
 * †Balanus nubilus – or unidentified comparable form
 * Bankia
 * Barbarofusus
 * Barbatia
 * Barbourofelis fricki.JPG †[[Barbourofelis]]
 * †Barbourofelis whitfordi
 * Barleeia
 * Barnea
 * †Basirepomys
 * Bassariscus
 * †Bassariscus astutus – or unidentified comparable form
 * †Bathylagus – type locality for genus
 * Bathytoma
 * †Bathytoma pacifica
 * †Batodonoides
 * Bembidion
 * †Benoistia
 * Beringraja
 * †Beringraja binoculata – or unidentified comparable form
 * Betula
 * Bison
 * †Bison antiquus
 * Bison latifrons fossil buffalo (Pleistocene; North America) 1 (15257877377).jpg †[[Bison latifrons]]
 * Bittium
 * †Bittium alternatum – or unidentified comparable form
 * Bivetopsia
 * †Boavus
 * †Bolbocara
 * Bolinichthys
 * Bonasa
 * †Bonasa umbellus
 * †Bonellitia
 * †Borophagus
 * †Borophagus diversidens
 * †Borophagus littoralis – type locality for species
 * †Borophagus parvus
 * †Borophagus secundus
 * †Borophryne
 * †Borophryne apogon
 * Brachidontes
 * Brachycrus.jpg †[[Brachycrus]]
 * †Brachypsalis
 * Brachyramphus
 * Branta
 * †Branta canadensis
 * †Branta nigricans – tentative report
 * Bubo
 * †Bubo virginianus
 * Buccinum
 * †Buccinum strigillatum
 * Bucephala
 * †Bucephala albeola
 * †Bucida
 * Bufo
 * Bulla
 * †Bulla gouldiana
 * †Bulla striata
 * Bullia
 * †Bumelia
 * Bursa
 * Buteo
 * †Buteo borealis
 * Buteo jamaicensis -Pillar Point Harbor, California, USA-8.jpg †[[Buteo jamaicensis]]
 * †Buteo swainsoni
 * Cadulus
 * Caecum
 * †Calicovatellus – type locality for genus
 * †Calicovatellus petrodytes – type locality for species
 * Calidris
 * †Calidris alba
 * Californiconus
 * †Californiconus californicus
 * Calliostoma
 * Calliostoma annulatum 1.jpg †[[Calliostoma annulatum]]
 * †Calliostoma canaliculatum
 * †Calliostoma gemmulatum
 * †Calliostoma ligatum
 * †Calliostoma supragranosum
 * †Calliostoma tricolor
 * Callista
 * Callorhinus
 * †Callorhinus ursinus
 * Calosoma
 * †Calosoma semilaeve
 * Calyptraea
 * †Calyptranthes
 * Camelops hesternus Sergiodlarosa.jpg †[[Camelops]]
 * †Camelops hesternus
 * †Camelops minidokae
 * Campanile
 * Camponotus – type locality for genus
 * †Camponotus festinatus – type locality for species
 * †Canarium
 * Cancellaria
 * †Cancellaria obesa
 * Cancer
 * Canis
 * †Canis dirus
 * †Canis edwardii
 * †Canis latrans
 * †Canis lepophagus
 * †Canis lupus
 * †Canis rufus
 * Canthon
 * †Canthon praticola
 * †Canthon simplex
 * †Cantius
 * †Capromeryx
 * Capromeryx minor p1350725.jpg]] †Capromeryx minor''
 * Caracara
 * †Caracara cheriway
 * †Caracara plancus
 * Carcharhinus
 * Carcharias
 * Carcharodon
 * †Carcharodon carcharias
 * †Carcharodon hastalis
 * Carpelimus
 * †Carpocyon
 * Carya
 * Caryophyllia
 * Cassidulina
 * Castanea
 * Castanopsis
 * Castor
 * †Castor californicus – or unidentified comparable form
 * Cathartes
 * Eastern Turkey Vulture (Canada).jpg †[[Cathartes aura]]
 * Catoptrophorus
 * †Catoptrophorus semipalmatus
 * †Catostomus
 * Ceanothus
 * Cedrela
 * †Celastrus
 * Celtis
 * Cepphus
 * †Cepphus columba
 * Cercidiphyllum
 * †Cercocarpus
 * Cerithidea
 * †Cerithidea californica
 * Cerithiopsis
 * Cerithium
 * †Cernina
 * †Cerorhinca
 * Cervus
 * †Cervus elaphus
 * Cetorhinus
 * †Cetorhinus maximus
 * Cetotherium BW.jpg †[[Cetotherium]]
 * †Chaenophryne
 * Chaetodipus
 * †Chaetodipus formosus – or unidentified comparable form
 * †Chalcidichthys – type locality for genus
 * Chama
 * †Chamaecyparis
 * Charadrius
 * †Charadrius semipalmatus
 * Chauliodus – type locality for genus
 * Chelonia
 * Chen
 * †Chen caerulescens
 * Chendytes cropped.png †[[Chendytes]] – type locality for genus
 * †Chendytes lawi – type locality for species
 * Chione
 * †Chione californiensis
 * Chlamys
 * †Chlamys hastata
 * †Chlamys rubida
 * †Chlamys swifti
 * Chlorostoma
 * †Chorizanthe
 * †Chrysobalanus
 * †Chrysocyon
 * †Chrysodomus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Chrysolepis
 * Cibicides
 * Cicindela
 * †Cicindela oregona
 * Cidaris cidaris MHNT.jpg [[Cidaris]]
 * Cinnamomum
 * Cissus
 * †Citellus
 * Citharichthys
 * †Citharichthys stigmaeus
 * Clathrodrillia
 * Clathurella
 * Clavilithes
 * Clavus
 * Clementia
 * Clethrionomys
 * Cletocamptus
 * Clinocardium cropped.png [[Clinocardium]]
 * †Clinocardium nuttallii
 * Cliona
 * Clupea
 * Clypeaster
 * Cnemidophorus
 * †Cocconeis
 * Cochliomyia – type locality for genus
 * †Cochliomyia macellaria – type locality for species
 * Codakia
 * Colaptes
 * †Colodon
 * Coluber
 * †Coluber constrictor
 * Colubraria
 * Columba – or unidentified comparable form
 * †Columba fasciata
 * Columbarium
 * †Conasprelloides
 * Concavus
 * Conus pelagicus Brocchi 1814Pliocene Cyprus.jpg [[Conus]]
 * †Conus fergusoni
 * †Conus regularis
 * †Conus scalaris
 * †Cophocetus – tentative report
 * Copris
 * Coragyps
 * Corbicula
 * Corbula
 * †Cormohipparion
 * Cornus
 * Coronula – tentative report
 * Corvus
 * †Corvus brachyrhynchos
 * †Corvus corax
 * †Cosoryx
 * Cranioceras unicornis life restoration.jpg Cranioceras, a relative of modern deer, with anachronistic human to scale]] †Cranioceras
 * Crassadoma
 * †Crassadoma gigantea
 * Crassispira
 * †Crassispira montereyensis – or unidentified related form
 * Crassostrea
 * †Crassostrea ashleyi
 * †Crassostrea titan
 * Crataegus
 * Crawfordina
 * Crepidula
 * †Crepidula adunca
 * †Crepidula onyx
 * Crepipatella
 * †Crepipatella lingulata
 * †Crommium
 * Crossata
 * †Crossata ventricosa
 * Crotalus
 * Crotalus viridis nuntius.jpg †[[Crotalus viridis]]
 * Crucibulum
 * †Crucibulum spinosum
 * †Cryptocarya
 * Cryptonatica
 * †Cryptonatica affinis
 * Cryptotermes
 * Cryptotis
 * Cucullaea
 * Culicoides
 * Cumingia
 * †Cupania
 * †Cupressus
 * †Cupressus goveniana
 * Cuspidaria
 * †Cuyamacamelus
 * Cyanocitta
 * †Cyanocitta stelleri
 * Cybocephalus
 * †Cybocephalus californicus – or unidentified comparable form
 * Cyclammina
 * Cyclocardia
 * Cyclothone microdon1.jpg [[Cyclothone]]
 * Cygnus
 * †Cygnus columbianus
 * Cylichna
 * Cymatium
 * Cymatogaster
 * †Cymatogaster aggregata
 * †Cynarctoides
 * †Cynarctoides acridens
 * †Cynarctus
 * Cynelos lemanensis.JPG †[[Cynelos]]
 * Cynoscion
 * Cyperus
 * Cypraea
 * Cyrtonyx
 * Cystiscus
 * Cythara
 * Cytherea
 * †Dalbergia
 * †Daphoenodon – or unidentified comparable form
 * Daphoenus vetus skeleton.jpg †[[Daphoenus]]
 * †Daphoenus ruber – type locality for species
 * Dardanus
 * †Dardanus arrosor
 * Dasyatis
 * Dasyhelea
 * †Decapterus
 * Deltochilum – tentative report
 * Dendragapus
 * †Dendragapus fuliginosus
 * †Dendragapus obscurus
 * Dendraster
 * Eccentric sand dollar.jpg †[[Dendraster excentricus]]
 * Dendrophyllia
 * Dendryphantes
 * Dentalium
 * †Dentalium neohexagonum
 * Dermochelys – or unidentified related form
 * Deroceras
 * †Desmatippus
 * †Desmatochoerus
 * †Desmocyon
 * †Desmodium
 * Desmostylus2DB.jpg †[[Desmostylus]]
 * †Desmostylus hesperus – type locality for species
 * Diacria
 * †Diceratherium
 * Dichocoenia
 * †Dinohippus
 * †Dinohyus
 * †Dinohyus hollandi
 * Diodora
 * †Diodora arnoldi
 * †Diodora aspera
 * †Diodora inaequalis
 * Diomedea
 * †Diospyros
 * Diploria
 * Dipodomys
 * †Dipodomys agilis – or unidentified comparable form
 * †Dipodomys compactus
 * †Dipodomys deserti – or unidentified comparable form
 * †Dipodomys heermanni – or unidentified comparable form
 * Merriam's Kangaroo Rat, Chihuahuan Desert, New Mexico.jpg †[[Dipodomys merriami]]
 * †Dipodomys ordii
 * †Dipoides
 * †Diprionomys
 * Discinisca
 * †Discohelix
 * †Dissacus
 * Distorsio
 * †Domnina
 * Donax
 * †Donax gouldii
 * Dosinia
 * †Dosinia dunkeri
 * †Drimys – type locality for genus
 * †Dromomeryx
 * Duchesneodus-skull.png †[[Duchesneodus]]
 * †Dusisiren
 * Dytiscus
 * Echinarachnius
 * Echinorhinus
 * Eclipes – type locality for genus
 * †Ectasis – type locality for genus
 * †Ectopistes
 * †Ectopistes migratorius
 * Eleodes
 * †Eleodes osculans – type locality for species
 * Elgaria
 * †Elgaria multicarinata
 * Elomeryx armatus.JPG †[[Elomeryx]]
 * †Enaliarctos
 * †Enaliarctos mealsi
 * †Enaliarctos mitchelli
 * †Enallagma – type locality for genus
 * Engelhardtia
 * Engina
 * Enhydra
 * †Enhydra lutris
 * †Enhydritherium terraenovae
 * Ensis
 * Entomobrya
 * †Eomellivora
 * Eopelobates wagneri 34.JPG †[[Eopelobates]]
 * †Eosurcula
 * †Epicyon
 * †Epicyon haydeni
 * †Epihippus
 * Epinephelus
 * †Epiphragmophora
 * Epitonium
 * Eptesicus
 * †Eptesicus fuscus – or unidentified comparable form
 * †Equisetum
 * Equus
 * †Equus idahoensi
 * Equus scotti cropped.png †[[Equus scotti]]
 * †Equus simplicidens
 * Eremophila
 * †Eremophila alpestris
 * Erethizon
 * †Erethizon dorsatum
 * †Eriquius
 * Eschrichtius
 * †Eschrichtius robustus – or unidentified comparable form
 * †Etringus
 * Eubalaena – or unidentified comparable form
 * †Eucastor
 * Euceratherium cropped.png †[[Euceratherium]] – type locality for genus
 * †Euceratherium collinum – type locality for species
 * †Eucyon
 * †Eucyon davisi
 * Euleptorhamphus
 * Eumetopias
 * †Euoplocyon
 * Euphagus
 * †Euphagus cyanocephalus
 * Euscelis
 * Eusmilia
 * Euspira
 * †Euspira lewisii
 * Eutamias
 * †Eutrephoceras
 * Euvola
 * †Evesthes
 * †Exilia
 * Falco
 * Peregrine Falcon with Kill.jpg †[[Falco peregrinus]]
 * †Falco sparverius
 * Felis
 * †Ficopsis
 * Ficus
 * Fimbria
 * Fissurella
 * †Fissurella volcano
 * Flabellipecten
 * Flabellum
 * †Forestiera
 * Forreria
 * †Forreria belcheri
 * †Fragilaria
 * Fratercula
 * Tufted Puffin Alaska (cropped).jpg †[[Fratercula cirrhata]]
 * †Fratercula dowi – type locality for species
 * †Fraxinus
 * Fulgoraria
 * †Fulica
 * †Fulica americana
 * Fulmarus
 * †Fulmarus glacialis
 * Fusinus
 * †Fusinus barbarensis
 * †Fusinus luteopictus
 * Tiger shark.jpg, or tiger shark]] Galeocerdo''
 * †Galeocerdo aduncus
 * Galeodea
 * Galeorhinus
 * †Ganolytes
 * Gari
 * Gasterosteus
 * †Gasterosteus aculeatus
 * Gastrochaena
 * Gavia
 * †Gavia arctica
 * Gavia immer -Minocqua, Wisconsin, USA -swimming-8.jpg †[[Gavia immer]]
 * †Gavia pacifica
 * †Gavia stellata
 * Gemmula
 * Genota
 * Genyonemus
 * †Genyonemus lineatus
 * Geochelone
 * †Geococcyx
 * The Greater Roadrunner Walking.jpg †[[Geococcyx californianus]]
 * Geomys
 * Geranoaetus
 * Gerrhonotus
 * †Gila – tentative report
 * †Gilbertia
 * Glans
 * Glaucidium
 * †Glaucidium gnoma
 * Glebocarcinus
 * Globigerina
 * †Globigerina bulloides
 * Globularia
 * Glossus
 * Glycimeris
 * Glycymeris
 * Glyptoactis
 * Glyptostrobus
 * Gomphotaria pugnax life restoration.jpg †[[Gomphotaria]] – type locality for genus
 * †Gomphotaria pugnax – type locality for species
 * †Gomphotherium
 * †Goniobasis – tentative report
 * Goniopora
 * Gopherus
 * †Gopherus agassizii
 * †Gordonia
 * Granulina
 * Gymnogyps
 * †Gymnogyps californianus – type locality for species
 * Gyroidina
 * Haliaeetus
 * †Haliaeetus leucocephalus
 * †Haliaetus
 * Haminoea
 * Harpagolestes immanis.jpg †[[Harpagolestes]] – or unidentified comparable form
 * Heloderma
 * †Hemiauchenia
 * †Hemiauchenia macrocephala
 * Hemipristis
 * †Hemipristis serra
 * Hemitelia
 * Hemitoma
 * Here
 * †Herpetocetus
 * Herpetotherium.jpg †[[Herpetotherium]]
 * †Herpetotherium knighti – or unidentified comparable form
 * Hespererato
 * †Hespererato columbella
 * †Hesperocamelus – or unidentified comparable form
 * Hesperomys
 * †Hesperotestudo
 * Heterodontus
 * Hexagrammos
 * Hexanchus
 * Hiatella
 * †Hiatella arctica
 * †Hiltonius
 * Hipparion3.jpg †[[Hipparion]]
 * †Hipparion forcei
 * †Hippidion
 * Hipponix
 * †Hipponoe
 * †Hippotherium
 * Histrionicus
 * †Histrionicus histrionicus – tentative report
 * Hodomys
 * Homalopoma
 * Homo
 * †Homo sapiens
 * Homotherium serum.jpg †[[Homotherium]]
 * †Homotherium serum – or unidentified comparable form
 * †Hoplophoneus
 * †Hyaenodon
 * †Hyaenodon venturae
 * †Hyaenodon vetus – type locality for species
 * Hyalina
 * Hydrangea
 * †Hydrodamalis
 * †Hydrodamalis cuestae – type locality for species
 * †Hydrodamalis gigas
 * Hydrophilus
 * Hyla
 * †Hyopsodus – or unidentified comparable form
 * †Hyperbaena
 * †Hypertragulus
 * †Hypohippus
 * †Hypolagus
 * †Hyrachyus
 * †Ilingoceros
 * Imagotaria downsi cropped.png †[[Imagotaria]] – type locality for genus
 * †Imagotaria downsi – type locality for species
 * †Indarctos
 * †Inga
 * †Ioscion
 * Ischnochiton
 * †Ischyrocyon
 * †Ischyromys
 * Isognomon
 * Isurus
 * †Isurus oxyrinchus
 * †Isurus planus
 * Jaton
 * †Julus
 * †Juncus
 * Juniperus
 * Kelletia
 * †Kelletia kelletii
 * Kellia
 * Kentriodon BW.jpg †[[Kentriodon]] – type locality for genus
 * †Keteleeria
 * †Kingena
 * Kurtzia
 * †Kurtzia arteaga
 * Kurtziella
 * †Kurtziella plumbea
 * †Labyrinthus
 * Lacuna
 * †Lacuna porrecta
 * †Lacuna unifasciata
 * †Lacunaria
 * Laevicardium
 * †Laevicardium elatum
 * Lagena
 * Lamna
 * Lampanyctus
 * †Lampris – type locality for genus
 * Lampris zatima.jpg †[[Lampris zatima]] – type locality for species
 * Lampropeltis
 * †Lampropeltis getulus
 * Larus
 * †Larus californicus
 * †Larus delawarensis
 * †Larus glaucescens
 * †Larus philadelphia
 * Latirus
 * †Laytonia – type locality for genus
 * Lechytia
 * Leda
 * Lepeta
 * Lepidochitona
 * Lepisosteus
 * †Lepisosteus spatula – or unidentified comparable form
 * †Leptacanthichthys
 * †Leptacanthichthys gracilispinis
 * Leptocyon gregorii holotype AMNH 12879.jpg †[[Leptocyon]]
 * †Leptomeryx
 * †Leptopecten latiauratus
 * †Leptoreodon
 * Lepus
 * †Lepus americanus
 * †Lepus californicus
 * †Lepus callotis
 * Leukoma
 * †Leukoma staminea
 * Lima
 * Limaria
 * Limnocyon ventral.png †[[Limnocyon]]
 * †Limosa
 * †Limosa fedoa
 * Linga
 * †Linophryne
 * †Linophryne indica
 * †Liolithax – type locality for genus
 * Liquidambar
 * †Lirosceles
 * Lirularia
 * †Lirularia lirulata
 * Lissodelphis – or unidentified comparable form
 * †Lithocarpus
 * Lithophaga
 * Lithophyllum
 * Lithornis.png †[[Lithornis]] – or unidentified comparable form
 * Lithothamnion
 * Littorina
 * †Littorina scutulata
 * †Lompoquia – type locality for genus
 * Lontra
 * †Lontra canadensis
 * †Lophar – type locality for genus
 * †Lophocetus
 * †Lophortyx
 * †Lora
 * Lottia
 * †Lottia limatula
 * †Lottia scabra
 * Lucapinella
 * †Lucapinella callomarginata
 * Lucina
 * Luidia
 * †Lycophocyon – type locality for genus
 * †Lycophocyon hutchisoni – type locality for species
 * †Lygisma – type locality for genus
 * Lygodium
 * Lynx
 * †Lynx rufus
 * Lyonsia
 * Lyria
 * [[File:Machairodus aphanistus - Cerro de los Batallones - Museo Arqueológico Regional CAM.JPG|thumb|upright|Fossilized cranium of the Miocene-Pleistocene saber-toothed cat Machairodus]] †[[Machairodus]]
 * Macoma
 * †Macoma nasuta
 * Macrarene
 * Macrocallista
 * †Macrodelphinus – type locality for genus
 * Madrepora
 * Magnolia
 * Mahonia
 * Makaira
 * Malea
 * †Malea ringens
 * Mallotus
 * †Mammut
 * †Mammut americanum
 * †Mammut cosoensis
 * †Mammut matthewi
 * †Mammuthus
 * †Mammuthus columbi
 * M. exilis skeletal.png †[[Mammuthus exilis]]
 * †Mammuthus primigenius
 * †Mancalla – type locality for genus
 * †Mancalla californiensis – type locality for species
 * †Mangelia
 * Margarites
 * †Margarites pupillus
 * Marginella
 * Marmota
 * Martes
 * Martesia
 * Maxwellia
 * †Maxwellia gemma
 * †Mayena – tentative report
 * †Mediochoerus
 * †Megacamelus
 * Megachasma
 * Megachile
 * †Megachile gentilis
 * †Megahippus
 * Megalonyx wheatleyi - AMNH - DSC06327.JPG †[[Megalonyx]]
 * †Megalonyx jeffersonii
 * †Megalonyx wheatleyi
 * Megalops – tentative report
 * †Megapaloelodus
 * Megaptera
 * Megathura – tentative report
 * †Megatylopus
 * Melampus
 * Melanella
 * Melanitta
 * †Melanitta deglandi – tentative report
 * †Melanitta fusca
 * †Melanitta perspicillata
 * Melanoplus
 * †Melanoplus differentialis
 * Meleagris
 * †Meliosma
 * Melospiza
 * †Melospiza melodia
 * †Meniscotherium
 * Menoceras NT small.jpg †[[Menoceras]]
 * Mephitis
 * †Mephitis mephitis
 * Meretrix
 * Mergus
 * †Mergus serrator
 * Merluccius
 * †Merluccius productus
 * †Merriamoceros
 * †Merychippus
 * †Merychyus
 * Merycodus cf. nectatus - National Museum of Natural History - IMG 2024.JPG †[[Merycodus]]
 * Mesalia
 * †Mesocyon
 * †Mesodma – tentative report
 * †Mesohippus
 * Mesophyllum
 * †Mesoreodon
 * †Metalopex
 * †Metarhinus
 * †Metatomarctus
 * Metaxytherium floridanum.jpg †[[Metaxytherium]]
 * †Miacis
 * †Michenia
 * †Microcosmodon – or unidentified comparable form
 * Microdipodops
 * Microgadus – tentative report
 * †Microsyops
 * †Microtomarctus
 * Microtus
 * †Microtus californicus
 * †Miocryptorhopalum – type locality for genus
 * †Miocyon
 * †Miohippus
 * †Miomancalla
 * †Miotapirus
 * †Miotylopus
 * Miracinonyx inexpectatus.jpg †[[Miracinonyx]]
 * †Miracinonyx studeri – tentative report
 * Mirounga
 * †Mirounga angustirostris – or unidentified comparable form
 * Mitra
 * †Mitra fultoni
 * †Mitra idae
 * Mitrella
 * †Mitrella carinata
 * †Mixocetus – type locality for genus
 * Modiolus
 * †Modiolus capax – or unidentified comparable form
 * Modulus
 * Monoplex
 * †Monoplex amictus
 * †Monosaulax
 * Montipora
 * Mopalia
 * †Mopalia ciliata
 * †Moropus
 * Morula
 * Morus – or unidentified comparable form
 * Morus
 * Mulinia
 * Murex – or unidentified related form
 * Musculus
 * Mustela
 * †Mustela frenata
 * †Mya
 * †Mya truncata
 * Myctophum
 * Myliobatis
 * †Myliobatis californicus
 * Mylohyus nasutus.jpg †[[Mylohyus]]
 * †Mylohyus fossilis
 * †Mylopharodon
 * †Mylopharodon conocephalus
 * Mytilus
 * †Mytilus californianus
 * †Mytilus edulis
 * Myurella
 * †Nannippus
 * †Nannocetus – type locality for genus
 * †Nanotragulus
 * Narona
 * †Narona clavatula
 * Nassa
 * Nassarius tiarula.jpg [[Nassarius]]
 * †Nassarius fossatus
 * Natica
 * Naticarius
 * †Navahoceros
 * Nectandra
 * Negaprion
 * †Neobernaya
 * †Neobernaya spadicea
 * †Neogyps
 * †Neogyps errans
 * †Neohipparion
 * †Neoliotomus – or unidentified comparable form
 * †Neolitsea
 * Paleoparadoxia Natural History Museum of Los Angeles County 20110330.jpg mammal Neoparadoxia]] †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
 * Neotoma
 * †Neotoma cinerea – type locality for species
 * †Neotoma fuscipes
 * †Neotoma lepida
 * Neptunea
 * Nerita
 * Neritina
 * †Nerium
 * Neverita
 * Nicrophorus
 * †Nicrophorus guttula
 * †Nicrophorus marginatus – type locality for species
 * †Nicrophorus nigrita
 * †Nimravides
 * Nimravus gomphodus.jpg †[[Nimravus]]
 * Niso – tentative report
 * †Nitzschia
 * Nodipecten
 * †Nodipecten subnodosus
 * Norrisia
 * †Norrisia norrisii
 * †Nothrotheriops
 * †Nothrotherium
 * Notiosorex
 * †Notiosorex crawfordi
 * Notoacmea
 * Hexanchus griseus (Bluntnose sixgill shark).gif cow shark]] Notorhynchus''
 * †Nototamias
 * Nucella
 * †Nucella emarginata
 * †Nucella lamellosa
 * †Nucella lima
 * Nucula
 * Numenius
 * Whimbrel Numenius phaeopus.jpg †[[Numenius phaeopus]]
 * Nuttallia
 * †Nyssa
 * Oceanodroma
 * †Oceanodroma furcata
 * †Oceanodroma homochroa
 * Ocenebra
 * Ocotea
 * †Ocystias
 * †Odaxosaurus
 * Odobenus
 * †Odobenus rosmarus
 * Navahoceros fricki.jpg, or American mountain deer]] Odocoileus''
 * †Odocoileus hemionus
 * †Odocoileus virginianus – or unidentified comparable form
 * Odontaspis
 * †Odontaspis ferox
 * 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 donilla 001.png †[[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 tenuisculpta – or unidentified comparable form
 * Oenopota
 * †Oenopota tabulata
 * Oliva
 * †Oliva spicata
 * Olivella
 * †Olivella baetica
 * †Olivella biplicata
 * †Olivella gracilis
 * †Olivella pedroana
 * Oncorhynchus
 * Oncorhynchus_rastrosus_reconstruction_by_Ray_Troll.png †[[Oncorhynchus rastrosus]]
 * Ondatra
 * Oneirodes
 * Onthophagus
 * Onychomys
 * †Onychomys torridus
 * Ophiodermella
 * †Ophiodermella inermis
 * †Opisthonema
 * Oreamnos
 * †Oreamnos americanus
 * Oreortyx
 * †Oreortyx picta
 * Orthemis
 * †Orthemis ferruginea
 * Orthodon
 * †Osbornodon
 * Osteodontornis BW cropped.png †[[Osteodontornis]] – type locality for genus
 * †Osteodontornis orri – type locality for species
 * Ostrea
 * †Ostrea conchaphila
 * †Ostrea lurida
 * †Otodus
 * †Otodus megalodon
 * Otus
 * †Otus asio
 * Ovibos
 * †Ovibos moschatus
 * Ovis
 * †Ovis canadensis
 * †Oxyrhina
 * †Oxyura
 * †Oxyura jamaicensis
 * †Ozymandias – type locality for genus
 * †Pacifichelys
 * †Palaeolagus
 * Paleoparadoxia BW.jpg mammal Paleoparadoxia]] †Paleoparadoxia
 * †Paleoparadoxia tabatai
 * Pandora
 * Panopea
 * †Panopea abrupta
 * Panthera
 * †Panthera leo
 * †Panthera onca – or unidentified comparable form
 * †Parabalaenoptera – type locality for genus
 * †Parabalaenoptera baulinensis – type locality for species
 * †Paracynarctus
 * †Parahippus
 * Paralichthys – type locality for genus
 * San Diego Paramylodon.jpg Paramylodon]] †Paramylodon
 * †Paramylodon harlani
 * †Paramys
 * †Parapontoporia
 * †Parapontoporia sternbergi – type locality for species
 * †Parastylotermes
 * †Parastylotermes calico – type locality for species
 * †Parastylotermes frazieri – type locality for species
 * †Paratomarctus
 * †Parietobalaena
 * †Paronychomys
 * †Parribacus
 * Patelloida
 * Pecten
 * †Pedalion
 * †Pediomeryx
 * †Pelagiarctos – type locality for genus
 * †Pelagiarctos thomasi – type locality for species
 * Pelagornis mauretanicus.png †[[Pelagornis]]
 * Pelecanus
 * †Pelecanus erythrorhynchus – or unidentified comparable form
 * †Pelecanus occidentalis
 * †Peltosaurus
 * †Peraceras
 * Perognathus
 * Peromyscus
 * †Peromyscus truei – or unidentified comparable form
 * †Perse
 * Persea
 * Persististrombus
 * Petricola
 * Phalacrocorax
 * †Phalacrocorax auritus
 * †Phalacrocorax pelagicus
 * †Phalacrocorax penicillatus
 * Phalaropus
 * †Phalaropus fulicaria
 * †Phalaropus lobatus
 * †Phanaeus
 * Phlaocyon.png †[[Phlaocyon]]
 * Phloeodes
 * †Phloeodes diabolicus
 * †Phloeodes plicatus
 * †Phoberogale
 * Phoca
 * †Phoca vitulina – or unidentified comparable form
 * Phocoena – or unidentified comparable form
 * †Phoebastria
 * †Phoebastria albatrus – type locality for species
 * Phoenicopterus – or unidentified comparable form
 * Pholadidea
 * Pholadomya
 * Pholas
 * Phos
 * †Photinia
 * Horned lizard 032507 kdh.jpg [[Phrynosoma]]
 * Phyllonotus
 * Physa
 * Picea
 * Pinna
 * Pinus
 * †Pinus muricata
 * †Pinus radiata
 * Piranga
 * †Piranga ludoviciana
 * Pitar
 * Pituophis
 * †Pituophis melanoleucus
 * Pitymys
 * Platanus
 * Platygonus leptorhinus cropped.png of the genus Platygonus. Charles R. Knight (1922).]] †Platygonus
 * Platynus
 * Plegadis
 * †Plegadis chihi
 * †Pleiolama
 * †Plesiadapis
 * †Plesiogulo
 * Pleurofusia
 * †Pleuroncodes
 * †Pleuronichthys
 * †Pliauchenia
 * †Pliocyon
 * †Pliohippus
 * †Pliometanastes
 * †Plionarctos
 * Pliopedia pacifica cropped.png †[[Pliopedia]] – type locality for genus
 * †Pliopedia pacifica – type locality for species
 * †Plithocyon
 * Pluvialis
 * †Pluvialis squatarola
 * †Poabromylus – tentative report
 * Pocillopora
 * Podiceps
 * †Podiceps auritus
 * Podilymbus
 * †Podilymbus podiceps
 * Pododesmus
 * †Pododesmus macrochisma
 * †Poebrodon
 * †Poebrodon californicus – type locality for species
 * Pogonodon platycopis.jpg †[[Pogonodon]]
 * Polinices
 * †Polinices lewisii
 * Polydora
 * Polymesoda
 * Polystira
 * †Pongamia
 * †Pontolis – or unidentified comparable form
 * †Pontolis magnus
 * Populus
 * Porichthys
 * Plainfin Midshipman cropped.jpg †[[Porichthys notatus]]
 * Porites
 * †Portunites
 * †Potamides
 * †Praemancalla – type locality for genus
 * Priene
 * Prionace
 * †Prionace glauca
 * †Pristichampsus
 * Pristiophorus
 * †Procamelus
 * †Procynodictis
 * Procyon
 * †Procyon lotor
 * †Promartes
 * †Protanthias – type locality for genus
 * †Protepicyon
 * Protitanops NT small.jpg †[[Protitanops]]
 * †Protohepialus – type locality for genus
 * †Protohepialus comstocki – type locality for species
 * †Protolabis
 * †Protomarctus
 * †Protostrix
 * Protothaca
 * †Protylopus
 * Prunus
 * Psephophorus NT small cropped.png †[[Psephophorus]]
 * †Pseudaelurus
 * Pseudochama
 * Pseudoliva
 * Pseudomelatoma
 * †Pseudomelatoma penicillata
 * †Pseudoseriola – type locality for genus
 * †Pseudotsuga
 * Pteria
 * †Pteroplatea
 * Pteropurpura
 * †Pteropurpura festiva
 * Pterostichus
 * Pterynotus
 * Ptilodus skull BW cropped.jpg †[[Ptilodus]]
 * Ptinus
 * Ptychoramphus
 * †Ptychoramphus aleuticus
 * Puffinus
 * †Puffinus griseus
 * †Puffinus opisthomelas
 * †Puffinus tenuirostris
 * †Puma
 * †Puma concolor – type locality for species
 * Puncturella
 * †Puncturella galeata
 * Purpura
 * Pusula
 * Pycnodonte pulaskiensis Clayton.jpg [[Pycnodonte]]
 * Pyramidella
 * †Pyramidella adamsi – or unidentified comparable form
 * Pyrene
 * Quercus
 * Raja
 * Rallus
 * †Rallus limicola
 * †Ramoceros
 * †Raja
 * Rallus
 * †Rallus limicola
 * Merycodus osborni cropped.png †[[Ramoceros]]
 * †Rana
 * Rapana
 * Recurvirostra
 * Reithrodontomys
 * †Repomys
 * Reticulitermes
 * Reticutriton
 * Retusa
 * †Rhabdammina
 * †Rhamnidium
 * †Rhamnus
 * Rhus
 * Rhynchotherium falconeri.png †[[Rhynchotherium]]
 * †Rhythmias
 * Rimella
 * Rissa
 * †Rissa tridactyla
 * Rissoina
 * †Robinia
 * †Rotularia
 * Sabal
 * Sagmatias
 * Salix
 * †Saniwa
 * †Saniwa ensidens – type locality for species
 * †Sapindus
 * †Sarda
 * Sassia
 * Saxidomus
 * †Saxidomus gigantea
 * †Saxidomus nuttalli
 * Scaldicetus grandis cropped.jpg †[[Scaldicetus]]
 * Scapanus
 * †Scapanus latimanus
 * Scaphander
 * Scapharca
 * Scaphinotus
 * †Scaphinotus interruptus
 * †Scaphohippus
 * Sceloporus
 * †Sceloporus occidentalis
 * †Schistomerus – type locality for genus
 * †Schistomerus californense – type locality for species
 * Schizaster
 * Sciurus
 * Scomber
 * †Scomberesox
 * Scopelogadus mizolepis mizolepis.png [[Scopelogadus]]
 * †Scutella
 * Scyliorhinus
 * †Scymnorhinus
 * †Sebastodes
 * Seila
 * Semele – tentative report
 * Semele
 * Semicassis
 * Semicossyphus
 * Semirostrum ceruttii skull.jpg †[[Semirostrum]] – type locality for genus
 * †Semirostrum ceruttii – type locality for species
 * †Sequoiadendron
 * †Serbelodon
 * Serica
 * Seriola
 * Seriphus
 * †Seriphus politus
 * Serpula
 * Serpulorbis
 * Sespia ultima californica cropped.png †[[Sespia]]
 * Siderastrea
 * Sigmodon
 * Sigmoilina – tentative report
 * Siliqua
 * †Siliqua patula – or unidentified related form
 * Sinum
 * Siphonalia
 * Skenea
 * †Skenea californica
 * †Smilax
 * Smilodon fatalis.jpg †[[Smilodon]]
 * †Smilodon fatalis
 * †Smilodon gracilis
 * †Smilodonichthys
 * Solariella
 * †Solariella peramabilis
 * Solemya
 * Solen
 * Solenosteira
 * Sorex
 * Spermophilus
 * CA Ground Squirrel on rock.jpg (formerly Spermophilus beecheyi), or California ground squirrel]] †Spermophilus beecheyi''
 * †Spermophilus lateralis
 * Sphyrna
 * Spilogale
 * †Spilogale putorius
 * Spirotropis
 * Spisula
 * Spondylus
 * Squalus
 * Squatina
 * †Squatina californica – or unidentified comparable form
 * Squilla
 * Stegomastodon mirificus - Smithsonian.JPG †[[Stegomastodon]]
 * †Stegomastodon mirificus – or unidentified comparable form
 * Stenella
 * †Stenomylus
 * †Stenomylus hitchcocki – or unidentified comparable form
 * Stenoplax
 * †Stenoplax conspicua
 * Stercorarius
 * Sterna
 * †Sternbergia – type locality for genus
 * Sthenictis
 * †Stictocarbo
 * Fossil ruminant.jpg †[[Stockoceros]] – or unidentified comparable form
 * Stomias
 * Stramonita
 * †Stramonita biserialis
 * †Stramonita canaliculata
 * †Striatolamia
 * Strioterebrum
 * Strombiformis
 * Strombus
 * †Strombus galeatus
 * †Strombus gracilior
 * Strongylocentrotus
 * †Strongylodon
 * Sturnella
 * Stylemys (1).jpg †[[Stylemys]]
 * Subcancilla
 * †Subcancilla sulcata
 * †Subhyracodon
 * Succinea
 * Sula
 * †Syllomus – or unidentified comparable form
 * Sylvilagus
 * †Sylvilagus audubonii
 * †Sylvilagus bachmani
 * †Sylvilagus floridanus
 * Syngnathus acus.jpg [[Syngnathus]]
 * Synthliboramphus
 * †Synthliboramphus antiquus
 * †Synthliboramphus hypoleucus
 * †Tabernaemontana
 * Tadorna
 * †Tadorna tadorna
 * Tagelus
 * †Tagelus californianus
 * †Tagelus subteres
 * Tamias
 * Tamiasciurus
 * †Tamiasciurus hudsonicus
 * †Tanymykter
 * South American tapir (Tapirus terrestris).JPG [[Tapirus]]
 * †Tapirus californicus
 * †Tapirus merriami – type locality for species
 * †Tapocyon
 * Taranis
 * Taricha
 * Taxidea
 * †Taxidea taxus
 * Tayassu
 * Tegula
 * †Tegula aureotincta
 * †Tegula eiseni
 * †Tegula ligulata
 * Teleoceras Horsfall cropped.jpg †[[Teleoceras]]
 * Tellina
 * †Temnocyon
 * Tenagodus
 * †Teratornis
 * †Teratornis merriami
 * Terebellum
 * Terebra
 * †Terebra pedroana
 * †Terebra protexta
 * Terebratula
 * Teredo
 * Terminalia
 * †Tessarolax – tentative report
 * Testudo
 * †Tetraclaenodon
 * †Tetrameryx
 * Thais
 * Thalassoleon mexicanus.jpg †[[Thalassoleon]]
 * †Thalassoleon macnallyae – type locality for species
 * †Thalassoleon mexicanus
 * †Thamnasteria
 * Thamnophis
 * Thomomys
 * †Thomomys bottae
 * †Thomomys monticola
 * Thracia
 * Thunnus – type locality for genus
 * Thyasira
 * †Thyrsites
 * †Ticholeptus
 * Timoclea
 * Titanotylopus nebraskensis skeleton.jpg †[[Titanotylopus]]
 * Tivela
 * †Tivela stultorum
 * †Tomarctus
 * †Tomarctus brevirostris
 * †Tomarctus hippophaga
 * Totanus
 * †Toxicodendron
 * Toxopneustes
 * †Toxopneustes roseus – or unidentified comparable form
 * Toxostoma
 * †Toxostoma redivivum
 * Trachycardium
 * Spectacled Bear - Houston Zoo.jpg [[Tremarctos]]
 * †Tremarctos floridanus
 * Tresus
 * †Tresus capax
 * †Tresus nuttallii
 * Triakis – tentative report
 * Trichotropis
 * Tricolia
 * †Tricolia pulloides
 * †Trigonictis macrodon
 * Trionyx
 * Triphora
 * Triplofusus
 * †Triplofusus princeps
 * Trochita
 * †Trogosus
 * Trophon
 * Tucetona
 * †Tucetona multicostata
 * †Tunita – type locality for genus
 * Turbonilla
 * †Turbonilla aepynota
 * †Turbonilla almo
 * †Turbonilla asser
 * †Turbonilla canfieldi
 * †Turbonilla carpenteri
 * †Turbonilla laminata
 * †Turbonilla pentalopha
 * †Turbonilla raymondi
 * †Turbonilla regina
 * †Turbonilla stylina
 * †Turbonilla tenuicula
 * †Turbonilla torquata
 * †Turbonilla tridentata
 * †Turbonilla weldi
 * Turcica monilifera 001.jpg [[Turcica]]
 * †Turcica caffea
 * Turdus
 * †Turio
 * Turricula
 * Turris
 * Turritella
 * Turritriton
 * †Turritriton gibbosus
 * Tursiops – or unidentified comparable form
 * Typha
 * Typhis
 * Tyto
 * †Tyto alba
 * Uca
 * Uinttather DB.jpg †[[Uintatherium]]
 * Ulmus
 * †Umbellularia
 * Uria
 * †Uria aalge
 * †Urobatis
 * †Urobatis halleri
 * †Urocitellus
 * †Urocitellus beldingi
 * Urocyon
 * †Urocyon cinereoargenteus
 * Urolophus
 * †Urolophus halleri – tentative report
 * Ursus
 * 01 Schwarzbär cropped.jpg †[[Ursus americanus]]
 * †Ustatochoerus
 * Uta
 * †Uta stansburiana
 * †Valenictus – type locality for genus
 * †Valenictus chulavistensis – type locality for species
 * †Valenictus imperialensis – type locality for species
 * †Vanderhoofius
 * Vasum
 * †Vauquelinia
 * †Velates
 * Velutina
 * †Velutina velutina
 * Venericardia
 * Venus
 * Vermicularia
 * Veromessor
 * Viburnum opulus C.jpg †[[Viburnum]]
 * †Vireo
 * Vitrinella – tentative report
 * Volsella
 * Voluta
 * Volutopsius
 * †Vouapa
 * Vulpes
 * †Vulpes cascadensis
 * †Vulpes velox
 * Williamia
 * †Wodnika
 * Xenophoridae - Xenophora infundibulum.jpg [[Xenophora]]
 * †Xyne – type locality for genus
 * Yoldia
 * †Yoldia cooperii
 * †Yumaceras – tentative report
 * †Zachrysia
 * Zalophus
 * †Zalophus californianus
 * †Zamites
 * †Zaphleges
 * †Zaphleges longurio
 * †Zapteryx
 * †Zarhinocetus
 * †Zarhinocetus errabundus – type locality for species
 * Zelkova
 * Zenaida
 * †Zenaida macroura
 * Zonotrichia
 * †Zonotrichia leucophrys
 * Mammut borsoni from Milia.jpg †[[Zygolophodon]]