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 Alabama.
Paleozoic
Selected Paleozoic taxa of California
- †Advenella
- †Agathiceras
- †Ampyx – tentative report
- †Ampyx
- †Apatolichas
- †Aspidella – tentative reportFossils of the mysterious Ediacaran organism Aspidella
- †Aspidella terranovica
- †Atrypa
- †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
- †CruzianaFossil of the Devonian-Triassic arthropod trackway ichnogenus Cruziana
- †Cyclolobus
- †Cyclonema
- †Cymbidium
- †Daguinaspis
- †Dicoelosia
- †Didymograptus
- †Dimeropygiella
- †Diplichnites
- †Encrinurus
- †Endoceras – tentative report
- †Euomphalus
- †Fallotaspis
- †Favosites
- †Fenestella
- †Gogia
- †Halysites
- †Helicoplacus
- †HelicoprionLife restoration of the Permian Chimaera relative Helicoprion
- †Helicoprion davisii
- †Heliomeroides
- †Hercynella
- †Holopea
- †Hyolithes
- †Illaenus
- †Ingria
- †Isogramma
- †Isotelus
- †Kawina
- †KutorginaIllustration of a fossilized shell of the brachiopod Kutorgina
- †Lingula
- †Lingulella
- †Lithostrotion
- †Lithostrotion pauciradiale
- †Lonchodomas
- †Meristella
- †Micromitra
- †Murchisonia
- †Neospirifer
- †Nephrolenellus
- †Nevadella
- †Obolella
- †OlenellusIllustration of a fossil of the Cambrian trilobite Olenellus
- †Olenellus fowleri – or unidentified comparable form
- †Oryctocephalus
- †Paladin
- Palaeoaplysina
- †Paleochiton
- †Parafusulina
- †Paraschwagerina
- †Peachella
- †PentamerusFossilized shell of the Silurian-Middle Devonian brachiopod Pentamerus
- †Phillipsia
- †Phyllograptus
- †Plaesiomys
- †Planolites
- †Platyceras
- †Poleumita
- †Proetus
- †Pteridinium – tentative report
- †Raymondaspis
- †Remopleurides
- †Repinaella
- †RusophycusFossil of the arthropod burrow ichnogenus 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
- †XenodiscusFossilized shells of the ammonoid cephalopod Xenodiscus
- †Zacanthoides
Mesozoic
Selected Mesozoic taxa of California
- †Abyssochrysos – tentative report
- †Acanthoceras
- Acanthosphaera – tentative report
- Acesta
- †Acrioceras
- †Acrodus
- †Acrodus wempliae – type locality for species
- †Acteon
- †Acteonella
- †Aletopelta – type locality for genusLife restoration of the Late Cretaceous armored dinosaur Aletopelta
- †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
- †AnomiaInterior and exterior of a shell of an Anomia, or jingle shell
- †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
- †AugustynolophusFossilized partial skull of the Late Cretaceous duck-billed dinosaur 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
- †CalifornosaurusRestoration of the Late Triassic ichthyosaur 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
- CidarisShell and spines of a Cidaris sea urchin
- †Clinura
- †Collignoniceras
- †Collonia
- Corbicula
- Corbula
- Cornutella
- †Cosmonautilus
- †Crioceratites
- Cucullaea
- †Cunningtoniceras
- †Cyclothyris
- Cylichna
- †Cylindroteuthis
- †Cymatoceras
- †CymbospondylusDiagram illustrating the Middle-Late Triassic ichthyosaur Cymbospondylus with an anachronistic human to scale.
- †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
- †EnchodusRestoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring"
- †Entobia
- †Eriphyla
- †Eucalycoceras
- †Euclastes
- †Euomphaloceras
- †Eupachydiscus
- †Euspira
- †Eutrephoceras
- †Exiteloceras
- †Exogyra
- †FagesiaFossilized shell of the Late Cretaceous ammonoid cephalopod 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
- †GrallatorFossil negative with skin impressions of the theropod dinosaur footprint ichnogenus 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
- †InoceramusFossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
- †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
- †KallirhynchiaFossilized shells of the Jurassic brachiopod Kallirhynchia
- †Kilianella
- †Kossmaticeras
- †Lacunaria
- Leda – tentative report
- Lima
- †Linearis
- †Lingula
- Lithophaga
- Lopha
- †Loxo
- †Lucina
- †Lysis
- †Lytoceras
- Macrocallista
- †Macrocephalites
- †Mammites – tentative report
- †Mantelliceras
- Margarella
- Margarites
- †MariellaFossilized shell of the Early-Late Cretaceous ammonoid cephalopod 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
- †NectosaurusLife restoration of the Late Triassic thalattosaurs Nectosaurus (right) and Thalattosaurus
- †Neithea
- †Neocardioceras – tentative report
- †Neohibolites
- †Neophylloceras
- †Neophylloceras hetonaiense
- †Neophylloceras ramosum
- †Nerinea
- Nerita
- †Nolita
- †Nostoceras
- †Nostoceras splendidum
- Nucula
- Opalia
- †Ophiceras
- †Opis
- †Orthoceras
- OstreaShell of an Ostrea, or oyster
- †Owenites
- †Owenites carpenteri
- †Owenites koeneni – type locality for species
- †Oxynautilus
- †Oxytoma
- †Pachydesmoceras
- †Pachydesmoceras pachydiscoide – type locality for species
- †Pachydiscus
- †Pachydiscus ootacodensis
- Panopea
- †ParapuzosiaFossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size
- 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
- †PlotosaurusLife restoration of the Late Cretaceous mosasaur Plotosaurus
- †Plotosaurus bennisoni
- †Plotosaurus tuckeri
- Polinices
- †Polycyclus
- †Polyptychites
- †Polyptychoceras
- †Posidonia
- †Potamides – tentative report
- †Proclydonautilus
- †Prognathodon
- †Prognathodon waiparaensis – or unidentified comparable form
- PropeamussiumFossilized shells of the Triassic-modern marine bivalve 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
- †SequoiaBase of the trunk of a living Sequoia tree with a human to scale
- 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
- †ThalattosaurusReconstructive illustration of the skull in side (above) and top view of the Late Triassic thalattosaur Thalattosaurus. The frontmost portion of the snout is portrayed erroneously as straight; it actually had a pronounced downward curve
- Thyasira
- †Tollia
- †Tragodesmoceras
- †Trigonia
- †Trinacria
- †Trochactaeon
- Trophon
- †Turrilites
- †Turrilites acutus
- †Turrilites costatus – or unidentified comparable form
- Turritella
- Volsella
- †Worthenia
- †Wyomingites
- †Yezoites
- YoldiaShell of a Yoldia limatula, or file yoldia
- †Zanola
- †Zealandites
Cenozoic
Selected Cenozoic taxa of California
- †Abantis
- AbiesA living Abies, or fir tree
- †Aboma
- †Acalypha
- Acanthina
- †Acanthina spirata
- Acanthocardia
- Acar
- Accipiter
- †Accipiter velox
- Acentrophryne
- Acer
- Acesta
- Acipenser
- †Acipenser medirostris – or unidentified comparable form
- Acmaea
- †AcritohippusMounted fossilized skeleton of the Miocene horse Acritohippus
- †Acritohippus isonesus – or unidentified comparable form
- Acteocina
- Acteon
- Actinemys
- †Actinemys marmorata
- Admete
- †Admete rhyssa
- Adula
- Aechmophorus
- †Aechmophorus occidentalis
- †Aelurodon
- †AepycamelusLife restoration of the Miocene camel Aepycamelus, or the long-necked camel. Heinrich Harder (1920).
- †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
- †AllodesmusFossilized skeleton of the Miocene seal Allodesmus
- †Allodesmus kernensis
- Alnus
- †Alopecocyon – type locality for genus
- Alopias
- †Alopias vulpinus – or unidentified comparable form
- Alvania
- Amara
- Amauropsis
- Amelanchier
- Ammospermophilus
- †Amorpha
- †Amphicyon
- †Amphicyon ingens
- †AmphimachairodusFossilized skull of the Miocene saber-toothed cat Amphimachairodus
- Amphissa
- Amphiura
- †Amphora
- †Ampullina
- Amusium
- Anachis
- Anadara
- Anas
- †Anas americana
- †Anas clypeata
- †Anas platyrhynchos
- †Anchitheriomys – or unidentified comparable form
- †AnchitheriumFossilized mandibles of the Miocene three-toed horse Anchitherium
- Ancilla
- Angulus
- Anniella
- Anodontia
- Anomia
- †Ansen
- Anser
- †Anser albifrons
- Antigona
- †Antilla
- Antilocapra
- Antrozous
- †Antrozous pallidus
- Aphelocoma
- †Aphelocoma californica
- †AphelopsReconstructive illustration of the skeleton of the Miocene-Pleistocene hornless rhinoceros 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
- †ArctodusRestoration of an Arctodus, or short-faced bear, with a human to scale
- †Arctodus simus – type locality for species
- †Arctostaphylos
- Ardea
- †Ardea herodias
- Arenaria
- †Arenaria melanocephala
- Arene
- †Argenna
- Argobuccinum
- Argopecten
- †Argopecten gibbusShells of Argopecten gibbus, or Atlantic calico scallops
- †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 – type locality for genusLife restoration of the Miocene sperm whale Aulophyseter
- Austrotrophon
- †Avipeda
- Aythya
- †Aythya affinis
- †Aythya valisineria
- Baiomys
- Balaenoptera
- †Balaenoptera physalus
- †Balaenoptera ryani
- †BalaenulaMounted fossilized skeleton of the Pliocene whale Balaenula
- Balanophyllia
- Balanus
- †Balanus crenatus
- †Balanus nubilus – or unidentified comparable form
- Bankia
- Barbarofusus
- Barbatia
- †BarbourofelisFossilized skull of the Miocene-Pliocene false saber-toothed cat Barbourofelis
- †Barbourofelis whitfordi
- Barleeia
- Barnea
- †Basirepomys
- Bassariscus
- †Bassariscus astutus – or unidentified comparable form
- †Bathylagus – type locality for genus
- Bathytoma
- †Batodonoides
- Bembidion
- †Benoistia
- Beringraja
- †Beringraja binoculata – or unidentified comparable form
- Betula
- Bison
- †Bison antiquus
- †Bison latifronsMounted fossilized skeleton of the Pleistocene Bison latifrons, also known as the giant bison or long-horned bison
- 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
- Brachidontes
- †BrachycrusRestorative portrait of the Miocene oreodont mammal Brachycrus
- †Brachypsalis
- Brachyramphus
- Branta
- †Branta canadensis
- †Branta nigricans – tentative report
- Bubo
- †Bubo virginianus
- Buccinum
- Bucephala
- †Bucephala albeola
- †Bucida
- Bufo
- Bulla
- Bullia
- †Bumelia
- Bursa
- Buteo
- †Buteo borealis
- †Buteo jamaicensisA living Buteo jamaicensis, or red-tailed hawk
- †Buteo swainsoni
- Cadulus
- Caecum
- †Calicovatellus – type locality for genus
- †Calicovatellus petrodytes – type locality for species
- Calidris
- †Calidris alba
- Californiconus
- Calliostoma
- †Calliostoma annulatumA living Calliostoma annulatum, or purple-ring top sea snail
- †Calliostoma canaliculatum
- †Calliostoma gemmulatum
- †Calliostoma ligatum
- †Calliostoma supragranosum
- †Calliostoma tricolor
- Callista
- Callorhinus
- †Callorhinus ursinus
- Calosoma
- Calyptraea
- †Calyptranthes
- †CamelopsLife restoration of the Pliocene-Holocene camel Camelops
- †Camelops hesternus
- †Camelops minidokae
- Campanile
- Camponotus – type locality for genus
- †Camponotus festinatus – type locality for species
- †Canarium
- Cancellaria
- Cancer
- Canis
- †Canis dirus
- †Canis edwardii
- †Canis latrans
- †Canis lepophagus
- †Canis lupus
- †Canis rufus
- Canthon
- †Cantius
- †Capromeryx
- †Capromeryx minorFossilized skeleton of the Pleistocene dwarf pronghorn Capromeryx
- 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
- †Cathartes auraA living Cathartes aura, or turkey vulture
- 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
- †CetotheriumLife restoration of the Miocene-Pliocene whale 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 – type locality for genusLife restoration of the Pleistocene-Holocene Chendytes, or Law's diving-goose
- †Chendytes lawi – type locality for species
- Chione
- Chlamys
- Chlorostoma
- †Chorizanthe
- †Chrysobalanus
- †Chrysocyon
- †Chrysodomus – report made of unidentified related form or using admittedly obsolete nomenclature
- †Chrysolepis
- Cibicides
- Cicindela
- CidarisShell and spines of a Cidaris sea urchin
- Cinnamomum
- Cissus
- †Citellus
- Citharichthys
- Clathrodrillia
- Clathurella
- Clavilithes
- Clavus
- Clementia
- Cletocamptus
- ClinocardiumShell of a Clinocardium cockle
- 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
- ConusFossilized shell of a Conus cone snail
- †Cophocetus – tentative report
- Copris
- Coragyps
- Corbicula
- Corbula
- †Cormohipparion
- Cornus
- Coronula – tentative report
- Corvus
- †Corvus brachyrhynchos
- †Corvus corax
- †Cosoryx
- †CraniocerasRestoration of the Miocene palaeomerycid Cranioceras, a relative of modern deer, with anachronistic human to scale
- Crassadoma
- †Crassadoma gigantea
- Crassispira
- †Crassispira montereyensis – or unidentified related form
- Crassostrea
- †Crassostrea ashleyi
- †Crassostrea titan
- Crataegus
- Crawfordina
- Crepidula
- Crepipatella
- †Crommium
- Crossata
- Crotalus
- †Crotalus viridisA living Crotalus viridis, or prairie rattlesnake
- Crucibulum
- †Cryptocarya
- Cryptonatica
- Cryptotermes
- Cryptotis
- Cucullaea
- Culicoides
- Cumingia
- †Cupania
- †Cupressus
- Cuspidaria
- †Cuyamacamelus
- Cyanocitta
- †Cyanocitta stelleri
- Cybocephalus
- †Cybocephalus californicus – or unidentified comparable form
- Cyclammina
- Cyclocardia
- CyclothoneIllustration of a living Cyclothone bristlemouth
- Cygnus
- †Cygnus columbianus
- Cylichna
- Cymatium
- Cymatogaster
- †Cymatogaster aggregata
- †Cynarctoides
- †Cynarctoides acridens
- †Cynarctus
- †CynelosFossilized cranium of the Miocene bear-dog Cynelos
- Cynoscion
- Cyperus
- Cypraea
- Cyrtonyx
- Cystiscus
- Cythara
- Cytherea
- †Dalbergia
- †Daphoenodon – or unidentified comparable form
- †DaphoenusMounted fossilized skeleton of the Eocene-Miocene bear-dog Daphoenus
- †Daphoenus ruber – type locality for species
- Dardanus
- Dasyatis
- Dasyhelea
- †Decapterus
- Deltochilum – tentative report
- Dendragapus
- †Dendragapus fuliginosus
- †Dendragapus obscurus
- Dendraster
- †Dendraster excentricusA living Dendraster excentricus, or sea cake
- Dendrophyllia
- Dendryphantes
- Dentalium
- Dermochelys – or unidentified related form
- Deroceras
- †Desmatippus
- †Desmatochoerus
- †Desmocyon
- †Desmodium
- †DesmostylusLife restoration of the Oligocene-Miocene herbivorous marine mammal Desmostylus
- †Desmostylus hesperus – type locality for species
- Diacria
- †Diceratherium
- Dichocoenia
- †Dinohippus
- †Dinohyus
- †Dinohyus hollandi
- Diodora
- Diomedea
- †Diomedia
- †Diospyros
- Diploria
- Dipodomys
- †Dipodomys agilis – or unidentified comparable form
- †Dipodomys compactus
- †Dipodomys deserti – or unidentified comparable form
- †Dipodomys heermanni – or unidentified comparable form
- †Dipodomys merriamiA living Dipodomys merriami, or Merriam's kangaroo rat
- †Dipodomys ordii
- †Dipoides
- †Diprionomys
- Discinisca
- †Discohelix
- †Dissacus
- Distorsio
- †Domnina
- Donax
- Dosinia
- †Drimys – type locality for genus
- †Dromomeryx
- †DuchesneodusIllustration of the fossilized jaws and teeth of the Eocene brontothere mammal 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
- †ElomeryxLife restoration of two of the Eocene-Oligocene anthracothere mammal Elomeryx being menaced by fellow-anthracothere Anthracotherium
- †Enaliarctos
- †Enaliarctos mealsi
- †Enaliarctos mitchelli
- †Enallagma – type locality for genus
- Engelhardtia
- Engina
- Enhydra
- †Enhydra lutris
- †Enhydritherium terraenovae
- Ensis
- Entomobrya
- †Eomellivora
- †EopelobatesFossilized skeleton of the Eocene-Pliocene frog Eopelobates
- †Eosurcula
- †Epicyon
- †Epicyon haydeni
- †Epihippus
- Epinephelus
- †Epiphragmophora
- Epitonium
- Eptesicus
- †Eptesicus fuscus – or unidentified comparable form
- †Equisetum
- Equus
- †Equus idahoensi
- †Equus scottiRestoration of the Pliocene-Holocene horse Equus scotti, or Scott's horse
- †Equus simplicidens
- Eremophila
- †Eremophila alpestris
- Erethizon
- †Erethizon dorsatum
- †Eriquius
- Eschrichtius
- †Eschrichtius robustus – or unidentified comparable form
- †Etringus
- Eubalaena – or unidentified comparable form
- †Eucastor
- †Euceratherium – type locality for genusLife restoration of the Pleistocene bovid Euceratherium, or the shrub ox. Robert Bruce Horsfall (1913).
- †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
- †Falco peregrinusA living Falco peregrinus, or peregrine falcon
- †Falco sparverius
- Felis
- †Ficopsis
- Ficus
- Fimbria
- Fissurella
- Flabellipecten
- Flabellum
- †Forestiera
- Forreria
- †Fragilaria
- Fratercula
- †Fratercula cirrhataA living Fratercula cirrhata, or tufted puffin
- †Fratercula dowi – type locality for species
- †Fraxinus
- Fulgoraria
- †Fulica
- †Fulica americana
- Fulmarus
- †Fulmarus glacialis
- Fusinus
- GaleocerdoA living Galeocerdo cuvier, or tiger shark
- †Galeocerdo aduncus
- Galeodea
- Galeorhinus
- †Ganolytes
- Gari
- Gasterosteus
- †Gasterosteus aculeatus
- Gastrochaena
- Gavia
- †Gavia arctica
- †Gavia immerA living Gavia immer, or common loon
- †Gavia pacifica
- †Gavia stellata
- Gemmula
- Genota
- Genyonemus
- †Genyonemus lineatus
- Geochelone
- †Geococcyx
- †Geococcyx californianusA living Geococcyx californianus, or greater roadrunner
- Geomys
- Geranoaetus
- Gerrhonotus
- †Gila – tentative report
- †Gilbertia
- Glans
- Glaucidium
- †Glaucidium gnoma
- Glebocarcinus
- Globigerina
- Globularia
- Glossus
- Glycimeris
- Glycymeris
- Glyptoactis
- Glyptostrobus
- †Gomphotaria – type locality for genusLife restoration of the Miocene walrus Gomphotaria
- †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 – or unidentified comparable formFossilized skull of the mesonychian mammal Harpagolestes
- Heloderma
- †Hemiauchenia
- †Hemiauchenia macrocephala
- Hemipristis
- Hemitelia
- Hemitoma
- Here
- †Herpetocetus
- †HerpetotheriumLife restoration of the Eocene-Miocene mammal Herpetotherium
- †Herpetotherium knighti – or unidentified comparable form
- Hespererato
- †Hesperocamelus – or unidentified comparable form
- Hesperomys
- †Hesperotestudo
- Heterodontus
- Hexagrammos
- Hexanchus
- Hiatella
- †Hiltonius
- †HipparionLife restoration of a herd of the Miocene-Pleistocene horse Hipparion. Heinrich Harder (1920).
- †Hipparion forcei
- †Hippidion
- Hipponix
- †Hipponoe
- †Hippotherium
- Histrionicus
- †Histrionicus histrionicus – tentative report
- Hodomys
- Homalopoma
- Homo
- †HomotheriumRestoration of Pliocene-Pleistocene Homotherium, or scimitar cat
- †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 – type locality for genusRestoration of the Miocene walrus Imagotaria
- †Imagotaria downsi – type locality for species
- †Indarctos
- †Inga
- †Ioscion
- Ischnochiton
- †Ischyrocyon
- †Ischyromys
- Isognomon
- Isurus
- †Isurus oxyrinchus
- †Isurus planus
- Jaton
- †Julus
- †Juncus
- Juniperus
- Kelletia
- Kellia
- †Kentriodon – type locality for genusLife restoration of the Oligocene-Miocene dolphin Kentriodon
- †Keteleeria
- †Kingena
- Kurtzia
- Kurtziella
- †Labyrinthus
- Lacuna
- †Lacunaria
- Laevicardium
- Lagena
- Lagenorhynchus
- Lamna
- Lampanyctus
- †Lampris – type locality for genus
- †Lampris zatima – type locality for speciesLife restoration of the Miocene opah fish Lampris zatima
- 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
- †LeptocyonIllustration of a fossilized skull of the Oligocene-Miocene dog Leptocyon
- †Leptomeryx
- †Leptoreodon
- Lepus
- †Lepus americanus
- †Lepus californicus
- †Lepus callotis
- Leukoma
- Lima
- Limaria
- †LimnocyonTop view of a fossilized skull of the Eocene creodont mammal Limnocyon
- †Limosa
- †Limosa fedoa
- Linga
- †Linophryne
- †Liolithax – type locality for genus
- Liquidambar
- †Lirosceles
- Lirularia
- Lissodelphis – or unidentified comparable form
- †Lithocarpus
- Lithophaga
- Lithophyllum
- †Lithornis – or unidentified comparable formLife restoration of the Paleocene-Eocene bird Lithornis
- Lithothamnion
- Littorina
- †Lompoquia – type locality for genus
- Lontra
- †Lontra canadensis
- †Lophar – type locality for genus
- †Lophocetus
- †Lophortyx
- †Lora
- Lottia
- Lucapinella
- Lucina
- Luidia
- †Lycophocyon – type locality for genus
- †Lycophocyon hutchisoni – type locality for species
- †Lygisma – type locality for genus
- Lygodium
- Lynx
- †Lynx rufus
- Lyonsia
- Lyria
- †MachairodusFossilized cranium of the Miocene-Pleistocene saber-toothed cat Machairodus
- Macoma
- Macrarene
- Macrocallista
- †Macrodelphinus – type locality for genus
- Madrepora
- Magnolia
- Mahonia
- Makaira
- Malea
- Mallotus
- †Mammut
- †Mammut americanum
- †Mammut cosoensis
- †Mammut matthewi
- †Mammuthus
- †Mammuthus columbi
- †Mammuthus exilisReconstructive illustration of the skeleton of a Mammuthus exilis, or pygmy mammoth
- †Mammuthus primigenius
- †Mancalla – type locality for genus
- †Mancalla californiensis – type locality for species
- †Mangelia
- Margarites
- Marginella
- Marmota
- Martes
- Martesia
- Maxwellia
- †Mayena – tentative report
- †Mediochoerus
- †Megacamelus
- Megachasma
- Megachile
- †Megahippus
- †MegalonyxMounted fossilized skeleton of the Miocene-Pleistocene ground sloth 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
- †MenocerasLife restoration of the Miocene rhinoceros Menoceras
- Mephitis
- †Mephitis mephitis
- Meretrix
- Mergus
- †Mergus serrator
- Merluccius
- †Merluccius productus
- †Merriamoceros
- †Merychippus
- †Merychyus
- †MerycodusFossilized skeleton of the Miocene pronghorn Merycodus
- Mesalia
- †Mesocyon
- †Mesodma – tentative report
- †Mesohippus
- Mesophyllum
- †Mesoreodon
- †Metalopex
- †Metarhinus
- †Metatomarctus
- †MetaxytheriumMounted fossilized skeleton of the Miocene-Pleistocene manatee relative 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
- †MiracinonyxRestoration of the Pliocene-Pleistocene Miracinonyx, or American cheetah
- †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
- †Monosaulax
- Montipora
- Mopalia
- †MoropusLife restoration of the Miocene chalicothere mammal Moropus threatening a pair of the bear-dog Daphoenodon. Jay Matternes (1964).
- Morula
- Morus – or unidentified comparable form
- Morus
- Mulinia
- Murex – or unidentified related form
- Musculus
- Mustela
- †Mustela frenata
- †Mya
- Myctophum
- Myliobatis
- †Myliobatis californicus
- †MylohyusFossilized skeleton of the Pliocene-Holocene peccary Mylohyus
- †Mylohyus fossilis
- †Mylopharodon
- Myodes
- Mytilus
- †Mytilus californianus
- †Mytilus edulis
- Myurella
- †Nannippus
- †Nannocetus – type locality for genus
- †Nanotragulus
- Narona
- Nassa
- NassariusA living Nassarius, or nassa mud snail
- Natica
- Naticarius
- †Navahoceros
- Nectandra
- Negaprion
- †Neobernaya
- †Neogyps
- †Neogyps errans
- †Neohipparion
- †Neoliotomus – or unidentified comparable form
- †Neolitsea
- †Neoparadoxia – type locality for genusMounted fossilized skeleton of the Miocene aquatic desmostylian mammal Neoparadoxia
- †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
- †NimravusIllustration of the fossilized skull of the Oligocene false saber-toothed cat Nimravus
- Niso – tentative report
- †Nitzschia
- Nodipecten
- Norrisia
- †Norrisia norrisi
- †Nothrotheriops
- †Nothrotherium
- Notiosorex
- †Notiosorex crawfordi
- Notoacmea
- NotorhynchusIllustration of a living Notorynchus cow shark
- †Nototamias
- Nucella
- Nucula
- Numenius
- †Numenius phaeopusA living Numenius phaeopus, or whimbrel
- Nuttallia
- †Nyssa
- Oceanodroma
- †Oceanodroma furcata
- †Oceanodroma homochroa
- Ocenebra
- Ocotea
- †Ocystias
- †Odaxosaurus
- Odobenus
- †Odobenus rosmarus
- OdocoileusMounted fossilized skeleton of the Pleistocene Odocoileus lucasi, or American mountain deer
- †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 donillaIllustration of the shell of an Odostomia donilla pyram shell sea snail
- †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
- Oliva
- Olivella
- Oncorhynchus
- †Oncorhynchus rastrosusLife restoration of a school of the Miocene-Pleistocene Oncorhynchus rastrosus, or saber-toothed salmon
- Ondatra
- Oneirodes
- Onthophagus
- Onychomys
- †Onychomys torridus
- Ophiodermella
- †Opisthonema
- Oreamnos
- †Oreamnos americanus
- Oreortyx
- †Oreortyx picta
- Orthemis
- †Orthemis ferruginea
- Orthodon
- †Osbornodon
- †Osteodontornis – type locality for genusLife restoration of the Miocene pseudo-toothed bird Osteodontornis
- †Osteodontornis orri – type locality for species
- Ostrea
- †Otodus
- †Otodus megalodon
- Otus
- †Otus asio
- Ovibos
- †Ovibos moschatus
- Ovis
- †Ovis canadensis
- †Oxyrhina
- †Oxyura
- †Oxyura jamaicensis
- †Ozymandias – type locality for genus
- †Pacifichelys
- †Palaeolagus
- †PaleoparadoxiaRestoration of the Miocene aquatic desmostylian mammal Paleoparadoxia
- †Paleoparadoxia tabatai
- Pandora
- Panopea
- 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
- †ParamylodonFossilized skeleton of the Pliocene-Pleistocene ground sloth 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
- †PelagornisReconstructive illustration of a fossilized skull of the Oligocene-Pleistocene pseudo-toothed bird Pelagornis, with close-up insets of its pseudo-teeth
- 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
- †PhlaocyonIllustration of a fossilized skull in multiple views of the Oligocene-Miocene bone-crushing dog 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
- PhrynosomaA living Phrynosoma, or horned lizard
- Phyllonotus
- Physa
- Picea
- Pinna
- Pinus
- †Pinus muricata
- †Pinus radiata
- Piranga
- †Piranga ludoviciana
- Pitar
- Pituophis
- Pitymys
- Platanus
- †PlatygonusRestoration of a herd of alarmed Miocene-Pleistocene peccaries of the genus Platygonus. Charles R. Knight (1922).
- Platynus
- Plegadis
- †Plegadis chihi
- †Pleiolama
- †Plesiadapis
- †Plesiogulo
- Pleurofusia
- †Pleuroncodes
- †Pleuronichthys
- †Pliauchenia
- †Pliocyon
- †Pliohippus
- †Pliometanastes
- †Plionarctos
- †Pliopedia – type locality for genusLife restoration of the Miocene walrus Pliopedia
- †Pliopedia pacifica – type locality for species
- †Plithocyon
- Pluvialis
- †Pluvialis squatarola
- †Poabromylus – tentative report
- Pocillopora
- Podiceps
- †Podiceps auritus
- Podilymbus
- †Podilymbus podiceps
- Pododesmus
- †Poebrodon
- †Poebrodon californicus – type locality for species
- †PogonodonIllustration of a fossilized skull of the Oligocene false faber-toothed cat Pogonodon
- Polinices
- †Polinices lewisii
- Polydora
- Polymesoda
- Polystira
- †Pongamia
- †Pontolis – or unidentified comparable form
- †Pontolis magnus
- Populus
- Porichthys
- †Porichthys notatusA modern Porichthys notatus, or plainfin midshipman
- 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
- †ProtitanopsLife restoration of the Eocene brontothere mammal Protitanops
- †Protohepialus – type locality for genus
- †Protohepialus comstocki – type locality for species
- †Protolabis
- †Protomarctus
- †Protostrix
- Protothaca
- †Protylopus
- Prunus
- †PsephophorusHypothetical restoration of the Oligocene-Pliocene sea turtle Psephophorus
- †Pseudaelurus
- Pseudochama
- Pseudoliva
- Pseudomelatoma
- †Pseudoseriola – type locality for genus
- †Pseudotsuga
- Pteria
- †Pteroplatea
- Pteropurpura
- Pterostichus
- Pterynotus
- †PtilodusIllustration of a fossilized skull of the Paleocene multituberculate mammal Ptilodus
- Ptinus
- Ptychoramphus
- †Ptychoramphus aleuticus
- Puffinus
- †Puffinus griseus
- †Puffinus opisthomelas
- †Puffinus tenuirostris
- †Puma
- †Puma concolor – type locality for species
- Puncturella
- Purpura
- Pusula
- PycnodonteAssemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
- Pyramidella
- †Pyramidella adamsi – or unidentified comparable form
- Pyrene
- Quercus
- Raja
- Rallus
- †Rallus limicola
- †Ramoceros
- †Raja
- Rallus
- †Rallus limicola
- †RamocerosLife restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx. Robert Bruce Horsfall (1913).
- †Rana
- Rapana
- Recurvirostra
- Reithrodontomys
- †Repomys
- Reticulitermes
- Reticutriton
- Retusa
- †Rhabdammina
- †Rhamnidium
- †Rhamnus
- Rhus
- †RhynchotheriumRestoration of the Miocene-Pliocene elephant relative Rhynchotherium
- †Rhythmias
- Rimella
- Rissa
- †Rissa tridactyla
- Rissoina
- †Robinia
- †Rotularia
- Sabal
- Salix
- †Saniwa
- †Saniwa ensidens – type locality for species
- †Sapindus
- †Sarda
- Sassia
- Saxidomus
- †ScaldicetusFossilized teeth of the Neogene sperm whale Scaldicetus
- Scapanus
- †Scapanus latimanus
- Scaphander
- Scapharca
- Scaphinotus
- †Scaphohippus
- Sceloporus
- †Sceloporus occidentalis
- †Schistomerus – type locality for genus
- †Schistomerus californense – type locality for species
- Schizaster
- Sciurus
- Scomber
- †Scomberesox
- ScopelogadusIllustration of a living Scopelogadus ridgehead
- †Scutella
- Scyliorhinus
- †Scymnorhinus
- †Sebastodes
- Seila
- Semele – tentative report
- Semele
- Semicassis
- Semicossyphus
- †Semirostrum – type locality for genusFossilized skull of the Pliocene porpoise Semirostrum
- †Semirostrum ceruttii – type locality for species
- †Sequoiadendron
- †Serbelodon
- Serica
- Seriola
- Seriphus
- †Seriphus politus
- Serpula
- Serpulorbis
- †SespiaRestoration of two species of the Oligocene oreodont mammal genus Sespia
- Siderastrea
- Sigmodon
- Sigmoilina – tentative report
- Siliqua
- †Siliqua patula – or unidentified related form
- Sinum
- Siphonalia
- Skenea
- †Smilax
- †SmilodonLife restoration of the Pleistocene-Holocene saber-tooth cat Smilodon
- †Smilodon fatalis
- †Smilodon gracilis
- †Smilodonichthys
- Solariella
- †Solariella peramabilis
- Solemya
- Solen
- Solenosteira
- Sorex
- Spermophilus
- †Spermophilus beecheyiA living Otospermophilus beecheyi (formerly Spermophilus beecheyi), or California ground squirrel
- †Spermophilus lateralis
- Sphyrna
- Spilogale
- †Spilogale putorius
- Spirotropis
- Spisula
- Spondylus
- Squalus
- Squatina
- †Squatina californica – or unidentified comparable form
- Squilla
- †StegomastodonMounted fossilized skeleton of the Pliocene-Pleistocene elephant relative Stegomastodon
- †Stegomastodon mirificus – or unidentified comparable form
- Stenella
- †Stenomylus
- †Stenomylus hitchcocki – or unidentified comparable form
- Stenoplax
- Stercorarius
- Sterna
- †Sternbergia – type locality for genus
- Sthenictis
- †Stictocarbo
- †Stockoceros – or unidentified comparable formMounted fossilized skeleton of the fossil pronghorn Stockoceros
- Stomias
- Stramonita
- †Striatolamia
- Strioterebrum
- Strombiformis
- Strombus
- †Strombus galeatus
- †Strombus gracilior
- Strongylocentrotus
- †Strongylodon
- Sturnella
- †StylemysMounted fossilized skeleton of the Eocene-Oligocene tortoise Stylemys
- Subcancilla
- †Subhyracodon
- Succinea
- Sula
- †Syllomus – or unidentified comparable form
- Sylvilagus
- †Sylvilagus audubonii
- †Sylvilagus bachmani
- †Sylvilagus floridanus
- SyngnathusA living Syngnathus pipefish
- Synthliboramphus
- †Synthliboramphus antiquus
- †Synthliboramphus hypoleucus
- †Tabernaemontana
- Tadorna
- †Tadorna tadorna
- Tagelus
- Tamias
- Tamiasciurus
- †Tamiasciurus hudsonicus
- †Tanymykter
- TapirusA living Tapirus, or tapir
- †Tapirus californicus
- †Tapirus merriami – type locality for species
- †Tapocyon
- Taranis
- Taricha
- Taxidea
- †Taxidea taxus
- Tayassu
- Tegula
- †TeleocerasRestoration of the Miocene-Pliocene rhinoceros Teleoceras
- Tellina
- †Temnocyon
- Tenagodus
- †Teratornis
- †Teratornis merriami
- Terebellum
- Terebra
- †Terebra pedroana
- †Terebra protexta
- Terebratula
- Teredo
- Terminalia
- †Tessarolax – tentative report
- Testudo
- †Tetraclaenodon
- †Tetrameryx
- Thais
- †ThalassoleonLife restoration of the Miocene fur seal 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
- †TitanotylopusMounted fossilized skeleton of the Miocene-Pleistocene camel Titanotylopus
- Tivela
- †Tomarctus
- †Tomarctus brevirostris
- †Tomarctus hippophaga
- Totanus
- †Toxicodendron
- Toxopneustes
- †Toxopneustes roseus – or unidentified comparable form
- Toxostoma
- †Toxostoma redivivum
- Trachycardium
- TremarctosA living Tremarctos, or spectacled bear
- Tresus
- Triakis – tentative report
- Trichotropis
- Tricolia
- †Tricolia pulloides
- †Trigonictis macrodon
- Trionyx
- Triphora
- Triplofusus
- Trochita
- †Trogosus
- Trophon
- Tucetona
- †Tunita – type locality for genus
- Turbonilla
- TurcicaShell of a Turcica sea snail
- Turdus
- †Turio
- Turricula
- Turris
- Turritella
- Turritriton
- Tursiops – or unidentified comparable form
- Typha
- Typhis
- Tyto
- †Tyto alba
- Uca
- †UintatheriumLife restoration of the Eocene mammal Uintatherium
- Ulmus
- †Umbellularia
- Uria
- †Uria aalge
- †Urobatis
- †Urobatis halleri
- †Urocitellus
- †Urocitellus beldingi
- Urocyon
- †Urocyon cinereoargenteus
- Urolophus
- †Urolophus halleri – tentative report
- Ursus
- †Ursus americanusA living Ursus americanus, or American black bear
- †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
- Venericardia
- Venus
- Vermicularia
- Veromessor
- †ViburnumLeaves and fruit of a living Viburnum.
- †Vireo
- Vitrinella – tentative report
- Volsella
- Voluta
- Volutopsius
- †Vouapa
- Vulpes
- †Vulpes cascadensis
- †Vulpes velox
- Williamia
- †Wodnika
- XenophoraFossilized shell of the Late Cretaceous-modern carrier shell sea snail Xenophora
- †Xyne – type locality for genus
- Yoldia
- †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
- †ZygolophodonKnown material diagram depicting the Miocene-Pleistocene mastodon relative Zygolophodon with a human to scale
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References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 7 August 2017.
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