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List of the prehistoric life of California

Last updated December 16, 2025

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.

Paleozoic

Selected Paleozoic taxa of California

† Advenella
† Agathiceras
† Ampyx – tentative report
† Ampyx
† Apatolichas
Fossils of the mysterious Ediacaran organism Aspidella
† 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
Fossil of the Devonian-Triassic arthropod trackway ichnogenus Cruziana
† Cruziana
† Cyclolobus
† Cyclonema
† Cymbidium
† Daguinaspis
† Dicoelosia
† Didymograptus
† Dimeropygiella
† Diplichnites
† Encrinurus
† Endoceras – tentative report
† Euomphalus
† Fallotaspis
† Favosites
† Fenestella
† Gogia
† Halysites
† Helicoplacus
Life restoration of the Permian Chimaera relative Helicoprion
† Helicoprion
- † Helicoprion davisii
† Heliomeroides
† Hercynella
† Holopea
† Hyolithes
† Illaenus
† Ingria
† Isogramma
† Isotelus
† Kawina
Illustration of a fossilized shell of the brachiopod Kutorgina
† Kutorgina
† Lingula
† Lingulella
† Lithostrotion
- † Lithostrotion pauciradiale
† Lonchodomas
† Meristella
† Micromitra
† Murchisonia
† Neospirifer
† Nephrolenellus
† Nevadella
† Obolella
Illustration of a fossil of the Cambrian trilobite Olenellus
† Olenellus
- † Olenellus fowleri – or unidentified comparable form
† Oryctocephalus
- † Oryctocephalus indicus
† Paladin
Palaeoaplysina
† Paleochiton
† Parafusulina
† Paraschwagerina
† Peachella
Fossilized shell of the Silurian-Middle Devonian brachiopod Pentamerus
† Pentamerus
† Phillipsia
† Phyllograptus
† Plaesiomys
† Planolites
† Platyceras
† Poleumita
† Proetus
† Pteridinium – tentative report
† Raymondaspis
† Remopleurides
† Repinaella
Fossil of the arthropod burrow ichnogenus Rusophycus
† 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
Fossilized shells of the ammonoid cephalopod Xenodiscus
† 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
Life restoration of the Late Cretaceous armored dinosaur Aletopelta
† 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
Interior and exterior of a shell of an Anomia , or jingle shell
† 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
Fossilized partial skull of the Late Cretaceous duck-billed dinosaur Augustynolophus
† 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
Restoration of the Late Triassic ichthyosaur Californosaurus
† 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
Shell and spines of a Cidaris sea urchin
Cidaris
† Clinura
† Collignoniceras
† Collonia
Corbicula
Corbula
Cornutella
† Cosmonautilus
† Crioceratites
Cucullaea
† Cunningtoniceras
† Cyclothyris
Cylichna
† Cylindroteuthis
† Cymatoceras
Diagram illustrating the Middle-Late Triassic ichthyosaur Cymbospondylus with an anachronistic human to scale.
† 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
Restoration of the Early Cretaceous-Eocene bony fish Enchodus , or the "saber-toothed herring"
† Enchodus
† Entobia
† Eriphyla
† Eucalycoceras
† Euclastes
† Euomphaloceras
† Eupachydiscus
† Euspira
† Eutrephoceras
† Exiteloceras
† Exogyra
Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia
† 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
Fossil negative with skin impressions of the theropod dinosaur footprint ichnogenus Grallator
† 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
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
† 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
Fossilized shells of the Jurassic brachiopod Kallirhynchia
† 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
Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Mariella
† 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
Life restoration of the Late Triassic thalattosaurs Nectosaurus (right) and Thalattosaurus
† Nectosaurus
† Neithea
† Neocardioceras – tentative report
† Neohibolites
† Neophylloceras
- † Neophylloceras hetonaiense
- † Neophylloceras ramosum
† Nerinea
Nerita
† Nolita
† Nostoceras
- † Nostoceras splendidum
Nucula
Opalia
† Ophiceras
† Opis
† Orthoceras
Shell of an Ostrea , or oyster
Ostrea
† Owenites
- † Owenites carpenteri
- † Owenites koeneni – type locality for species
† Oxynautilus
† Oxytoma
† Pachydesmoceras
- † Pachydesmoceras pachydiscoide – type locality for species
† Pachydiscus
- † Pachydiscus ootacodensis
Panopea
Fossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size
† 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
Life restoration of the Late Cretaceous mosasaur Plotosaurus
† Plotosaurus
- † Plotosaurus bennisoni
- † Plotosaurus tuckeri
Polinices
† Polycyclus
† Polyptychites
† Polyptychoceras
† Posidonia
† Potamides – tentative report
† Proclydonautilus
† Prognathodon
- † Prognathodon waiparaensis – or unidentified comparable form
Fossilized shells of the Triassic-modern marine bivalve Propeamussium
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
Base of the trunk of a living Sequoia tree with a human to scale
† 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
Reconstructive 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
† Thalattosaurus
Thyasira
† Tollia
† Tragodesmoceras
† Trigonia
† Trinacria
† Trochactaeon
Trophon
† Turrilites
- † Turrilites acutus
- † Turrilites costatus – or unidentified comparable form
Turritella
Volsella
† Worthenia
† Wyomingites
† Yezoites
Shell of a Yoldia limatula , or file yoldia
Yoldia
† Zanola
† Zealandites

Cenozoic

Selected Cenozoic taxa of California

† Abantis
A living Abies , or fir tree
Abies
† Aboma
† Acalypha
Acanthina
- † Acanthina spirata
Acanthocardia
Acar
Accipiter
- † Accipiter velox
Acentrophryne
Acer
Acesta
Acipenser
- † Acipenser medirostris – or unidentified comparable form
Acmaea
- † Acmaea mitra
Mounted fossilized skeleton of the Miocene horse Acritohippus
† Acritohippus
- † Acritohippus isonesus – or unidentified comparable form
Acteocina
Acteon
Actinemys
- † Actinemys marmorata
Admete
- † Admete rhyssa
Adula
Aechmophorus
- † Aechmophorus occidentalis
† Aelurodon
Life restoration of the Miocene camel Aepycamelus , or the long-necked camel. Heinrich Harder (1920).
† 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
Fossilized skeleton of the Miocene seal 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
Fossilized skull of the Miocene saber-toothed cat Amphimachairodus
† Amphimachairodus
Amphissa
- † Amphissa versicolor
Amphiura
† Amphora
† Ampullina
Amusium
Anachis
Anadara
Anas
- † Anas americana
- † Anas clypeata
- † Anas platyrhynchos
† Anchitheriomys – or unidentified comparable form
Fossilized mandibles of the Miocene three-toed horse Anchitherium
† Anchitherium
Ancilla
Angulus
Anniella
Anodontia
Anomia
† Ansen
Anser
- † Anser albifrons
Antigona
†Antilla
Antilocapra
Antrozous
- † Antrozous pallidus
Aphelocoma
- † Aphelocoma californica
Reconstructive illustration of the skeleton of the Miocene-Pleistocene hornless rhinoceros Aphelops
† 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
Restoration of an Arctodus , or short-faced bear, with a human to scale
† Arctodus
- † Arctodus simus – type locality for species
† Arctostaphylos
Ardea
- † Ardea herodias
Arenaria
- † Arenaria melanocephala
Arene
† Argenna
Argobuccinum
Argopecten
- Shells of Argopecten gibbus , or Atlantic calico scallops
  † 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
Life restoration of the Miocene sperm whale Aulophyseter
† Aulophyseter – type locality for genus
Austrotrophon
† Avipeda
Aythya
- † Aythya affinis
- † Aythya valisineria
Baiomys
Balaenoptera
- † Balaenoptera physalus
- † Balaenoptera ryani
Mounted fossilized skeleton of the Pliocene whale Balaenula
† Balaenula
Balanophyllia
- † Balanophyllia elegans
Balanus
- † Balanus crenatus
- † Balanus nubilus – or unidentified comparable form
Bankia
Barbarofusus
Barbatia
Fossilized skull of the Miocene-Pliocene false saber-toothed cat Barbourofelis
† 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
- Mounted fossilized skeleton of the Pleistocene Bison latifrons , also known as the giant bison or long-horned bison
  † 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
Restorative portrait of the Miocene oreodont mammal Brachycrus
† 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
- A living Buteo jamaicensis , or red-tailed hawk
  † Buteo jamaicensis
- † Buteo swainsoni
Cadulus
Caecum
† Calicovatellus – type locality for genus
- † Calicovatellus petrodytes – type locality for species
Calidris
- † Calidris alba
Californiconus
- † Californiconus californicus
Calliostoma
- A living Calliostoma annulatum , or purple-ring top sea snail
  † Calliostoma annulatum
- † Calliostoma canaliculatum
- † Calliostoma gemmulatum
- † Calliostoma ligatum
- † Calliostoma supragranosum
- † Calliostoma tricolor
Callista
Callorhinus
- † Callorhinus ursinus
Calosoma
- † Calosoma semilaeve
Calyptraea
† Calyptranthes
Life restoration of the Pliocene-Holocene camel Camelops
† 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
- Fossilized skeleton of the Pleistocene dwarf pronghorn Capromeryx
  † 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
- A living Cathartes aura , or turkey vulture
  † 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
Life restoration of the Miocene-Pliocene whale Cetotherium
† 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
Life restoration of the Pleistocene-Holocene Chendytes , or Law's diving-goose
† 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
Shell and spines of a Cidaris sea urchin
Cidaris
Cinnamomum
Cissus
† Citellus
Citharichthys
- † Citharichthys stigmaeus
Clathrodrillia
Clathurella
Clavilithes
Clavus
Clementia
Clethrionomys
Cletocamptus
Shell of a Clinocardium cockle
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
Fossilized shell of a Conus cone snail
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
Restoration of the Miocene palaeomerycid 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
- A living Crotalus viridis , or prairie rattlesnake
  † 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
Illustration of a living Cyclothone bristlemouth
Cyclothone
Cygnus
- † Cygnus columbianus
Cylichna
Cymatium
Cymatogaster
- † Cymatogaster aggregata
† Cynarctoides
- † Cynarctoides acridens
† Cynarctus
Fossilized cranium of the Miocene bear-dog Cynelos
† Cynelos
Cynoscion
Cyperus
Cypraea
Cyrtonyx
Cystiscus
Cythara
Cytherea
† Dalbergia
† Daphoenodon – or unidentified comparable form
Mounted fossilized skeleton of the Eocene-Miocene bear-dog Daphoenus
† Daphoenus
- † Daphoenus ruber – type locality for species
Dardanus
- † Dardanus arrosor
Dasyatis
Dasyhelea
† Decapterus
Deltochilum – tentative report
Dendragapus
- † Dendragapus fuliginosus
- † Dendragapus obscurus
Dendraster
- A living Dendraster excentricus , or sea cake
  † Dendraster excentricus
Dendrophyllia
Dendryphantes
Dentalium
- † Dentalium neohexagonum
Dermochelys – or unidentified related form
Deroceras
† Desmatippus
† Desmatochoerus
† Desmocyon
† Desmodium
Life restoration of the Oligocene-Miocene herbivorous marine mammal Desmostylus
† 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
- A living Dipodomys merriami , or Merriam's kangaroo rat
  † Dipodomys merriami
- † Dipodomys ordii
† Dipoides
† Diprionomys
Discinisca
† Discohelix
† Dissacus
Distorsio
† Domnina
Donax
- † Donax gouldii
Dosinia
- † Dosinia dunkeri
† Drimys – type locality for genus
† Dromomeryx
Illustration of the fossilized jaws and teeth of the Eocene brontothere mammal Duchesneodus
† 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
Life restoration of two of the Eocene-Oligocene anthracothere mammal Elomeryx being menaced by fellow-anthracothere Anthracotherium
† Elomeryx
† Enaliarctos
- † Enaliarctos mealsi
- † Enaliarctos mitchelli
† Enallagma – type locality for genus
Engelhardtia
Engina
Enhydra
- † Enhydra lutris
- † Enhydritherium terraenovae
Ensis
Entomobrya
† Eomellivora
Fossilized skeleton of the Eocene-Pliocene frog Eopelobates
† Eopelobates
† Eosurcula
† Epicyon
- † Epicyon haydeni
† Epihippus
Epinephelus
† Epiphragmophora
Epitonium
Eptesicus
- † Eptesicus fuscus – or unidentified comparable form
† Equisetum
Equus
- † Equus idahoensi
- Restoration of the Pliocene-Holocene horse Equus scotti , or Scott's horse
  † 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
Life restoration of the Pleistocene bovid Euceratherium , or the shrub ox. Robert Bruce Horsfall (1913).
† 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
- A living Falco peregrinus , or peregrine falcon
  † Falco peregrinus
- † Falco sparverius
Felis
† Ficopsis
Ficus
Fimbria
Fissurella
- † Fissurella volcano
Flabellipecten
Flabellum
† Forestiera
Forreria
- † Forreria belcheri
† Fragilaria
Fratercula
- A living Fratercula cirrhata , or tufted puffin
  † Fratercula cirrhata
- † Fratercula dowi – type locality for species
† Fraxinus
Fulgoraria
† Fulica
- † Fulica americana
Fulmarus
- † Fulmarus glacialis
Fusinus
- † Fusinus barbarensis
- † Fusinus luteopictus
A living Galeocerdo cuvier , or tiger shark
Galeocerdo
- † Galeocerdo aduncus
Galeodea
Galeorhinus
† Ganolytes
Gari
Gasterosteus
- † Gasterosteus aculeatus
Gastrochaena
Gavia
- † Gavia arctica
- A living Gavia immer , or common loon
  † Gavia immer
- † Gavia pacifica
- † Gavia stellata
Gemmula
Genota
Genyonemus
- † Genyonemus lineatus
Geochelone
† Geococcyx
- A living Geococcyx californianus , or greater roadrunner
  † Geococcyx californianus
Geomys
Geranoaetus
Gerrhonotus
† Gila – tentative report
† Gilbertia
Glans
Glaucidium
- † Glaucidium gnoma
Glebocarcinus
Globigerina
- † Globigerina bulloides
Globularia
Glossus
Glycimeris
Glycymeris
Glyptoactis
Glyptostrobus
Life restoration of the Miocene walrus Gomphotaria
† 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
Fossilized skull of the mesonychian mammal Harpagolestes
† Harpagolestes – or unidentified comparable form
Heloderma
† Hemiauchenia
- † Hemiauchenia macrocephala
Hemipristis
- † Hemipristis serra
Hemitelia
Hemitoma
Here
† Herpetocetus
Life restoration of the Eocene-Miocene mammal Herpetotherium
† Herpetotherium
- † Herpetotherium knighti – or unidentified comparable form
Hespererato
- † Hespererato columbella
† Hesperocamelus – or unidentified comparable form
Hesperomys
† Hesperotestudo
Heterodontus
Hexagrammos
Hexanchus
Hiatella
- † Hiatella arctica
† Hiltonius
Life restoration of a herd of the Miocene-Pleistocene horse Hipparion . Heinrich Harder (1920).
† Hipparion
- † Hipparion forcei
† Hippidion
Hipponix
† Hipponoe
† Hippotherium
Histrionicus
- † Histrionicus histrionicus – tentative report
Hodomys
Homalopoma
Homo
- † Homo sapiens
Restoration of Pliocene-Pleistocene Homotherium , or scimitar cat
† 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
Restoration of the Miocene walrus Imagotaria
† 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
Life restoration of the Oligocene-Miocene dolphin Kentriodon
† 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
- Life restoration of the Miocene opah fish Lampris zatima
  † 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
Illustration of a fossilized skull of the Oligocene-Miocene dog Leptocyon
† Leptocyon
† Leptomeryx
- † Leptopecten latiauratus
† Leptoreodon
Lepus
- † Lepus americanus
- † Lepus californicus
- † Lepus callotis
Leukoma
- † Leukoma staminea
Lima
Limaria
Top view of a fossilized skull of the Eocene creodont mammal Limnocyon
† 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
Life restoration of the Paleocene-Eocene bird Lithornis
† 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
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
- Reconstructive illustration of the skeleton of a Mammuthus exilis , or pygmy mammoth
  † 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
Mounted fossilized skeleton of the Miocene-Pleistocene ground sloth Megalonyx
† 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
Life restoration of the Miocene rhinoceros Menoceras
† Menoceras
Mephitis
- † Mephitis mephitis
Meretrix
Mergus
- † Mergus serrator
Merluccius
- † Merluccius productus
† Merriamoceros
† Merychippus
† Merychyus
Fossilized skeleton of the Miocene pronghorn Merycodus
† Merycodus
Mesalia
† Mesocyon
† Mesodma – tentative report
† Mesohippus
Mesophyllum
† Mesoreodon
† Metalopex
† Metarhinus
† Metatomarctus
Mounted fossilized skeleton of the Miocene-Pleistocene manatee relative Metaxytherium
† 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
Restoration of the Pliocene-Pleistocene Miracinonyx , or American cheetah
† 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
Fossilized skeleton of the Pliocene-Holocene peccary Mylohyus
† Mylohyus
- † Mylohyus fossilis
† Mylopharodon
- † Mylopharodon conocephalus
Mytilus
- † Mytilus californianus
- † Mytilus edulis
Myurella
† Nannippus
† Nannocetus – type locality for genus
† Nanotragulus
Narona
- † Narona clavatula
Nassa
A living Nassarius , or nassa mud snail
Nassarius
- † Nassarius fossatus
Natica
Naticarius
† Navahoceros
Nectandra
Negaprion
† Neobernaya
- † Neobernaya spadicea
† Neogyps
- † Neogyps errans
† Neohipparion
† Neoliotomus – or unidentified comparable form
† Neolitsea
Mounted fossilized skeleton of the Miocene aquatic desmostylian 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
Illustration of the fossilized skull of the Oligocene false saber-toothed cat Nimravus
† Nimravus
Niso – tentative report
† Nitzschia
Nodipecten
- † Nodipecten subnodosus
Norrisia
- † Norrisia norrisii
† Nothrotheriops
† Nothrotherium
Notiosorex
- † Notiosorex crawfordi
Notoacmea
Illustration of a living Notorynchus cow shark
Notorhynchus
† Nototamias
Nucella
- † Nucella emarginata
- † Nucella lamellosa
- † Nucella lima
Nucula
Numenius
- A living Numenius phaeopus , or whimbrel
  † Numenius phaeopus
Nuttallia
† Nyssa
Oceanodroma
- † Oceanodroma furcata
- † Oceanodroma homochroa
Ocenebra
Ocotea
† Ocystias
† Odaxosaurus
Odobenus
- † Odobenus rosmarus
Mounted fossilized skeleton of the Pleistocene Odocoileus lucasi , 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
- Illustration of the shell of an Odostomia donilla pyram shell sea snail
  † 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
- Life restoration of a school of the Miocene-Pleistocene Oncorhynchus rastrosus , or saber-toothed salmon
  † Oncorhynchus rastrosus
Ondatra
Oneirodes
Onthophagus
Onychomys
- † Onychomys torridus
Ophiodermella
- † Ophiodermella inermis
† Opisthonema
Oreamnos
- † Oreamnos americanus
Oreortyx
- † Oreortyx picta
Orthemis
- † Orthemis ferruginea
Orthodon
† Osbornodon
Life restoration of the Miocene pseudo-toothed bird Osteodontornis
† 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
Restoration of the Miocene aquatic desmostylian 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
Fossilized skeleton of the Pliocene-Pleistocene ground sloth 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
Reconstructive illustration of a fossilized skull of the Oligocene-Pleistocene pseudo-toothed bird Pelagornis , with close-up insets of its pseudo-teeth
† 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
Illustration of a fossilized skull in multiple views of the Oligocene-Miocene bone-crushing dog Phlaocyon
† 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
A living Phrynosoma , or horned lizard
Phrynosoma
Phyllonotus
Physa
Picea
Pinna
Pinus
- † Pinus muricata
- † Pinus radiata
Piranga
- † Piranga ludoviciana
Pitar
Pituophis
- † Pituophis melanoleucus
Pitymys
Platanus
Restoration of a herd of alarmed Miocene-Pleistocene peccaries of the genus Platygonus . Charles R. Knight (1922).
† Platygonus
Platynus
Plegadis
- † Plegadis chihi
† Pleiolama
† Plesiadapis
† Plesiogulo
Pleurofusia
† Pleuroncodes
† Pleuronichthys
† Pliauchenia
† Pliocyon
† Pliohippus
† Pliometanastes
† Plionarctos
Life restoration of the Miocene walrus Pliopedia
† 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
Illustration of a fossilized skull of the Oligocene false faber-toothed cat Pogonodon
† Pogonodon
Polinices
- † Polinices lewisii
Polydora
Polymesoda
Polystira
† Pongamia
† Pontolis – or unidentified comparable form
- † Pontolis magnus
Populus
Porichthys
- A modern Porichthys notatus , or plainfin midshipman
  † 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
Life restoration of the Eocene brontothere mammal Protitanops
† Protitanops
† Protohepialus – type locality for genus
- † Protohepialus comstocki – type locality for species
† Protolabis
† Protomarctus
† Protostrix
Protothaca
† Protylopus
Prunus
Hypothetical restoration of the Oligocene-Pliocene sea turtle Psephophorus
† Psephophorus
† Pseudaelurus
Pseudochama
Pseudoliva
Pseudomelatoma
- † Pseudomelatoma penicillata
† Pseudoseriola – type locality for genus
† Pseudotsuga
Pteria
† Pteroplatea
Pteropurpura
- † Pteropurpura festiva
Pterostichus
Pterynotus
Illustration of a fossilized skull of the Paleocene multituberculate mammal Ptilodus
† Ptilodus
Ptinus
Ptychoramphus
- † Ptychoramphus aleuticus
Puffinus
- † Puffinus griseus
- † Puffinus opisthomelas
- † Puffinus tenuirostris
† Puma
- † Puma concolor – type locality for species
Puncturella
- † Puncturella galeata
Purpura
Pusula
Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
Pycnodonte
Pyramidella
- † Pyramidella adamsi – or unidentified comparable form
Pyrene
Quercus
Raja
Rallus
- † Rallus limicola
† Ramoceros
† Raja
Rallus
- † Rallus limicola
Life restoration of the Miocene-Pliocene pronghorn Ramoceros and Cosoryx . Robert Bruce Horsfall (1913).
† Ramoceros
† Rana
Rapana
Recurvirostra
Reithrodontomys
† Repomys
Reticulitermes
Reticutriton
Retusa
† Rhabdammina
† Rhamnidium
† Rhamnus
Rhus
Restoration of the Miocene-Pliocene elephant relative Rhynchotherium
† 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
Fossilized teeth of the Neogene sperm whale Scaldicetus
† 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
Illustration of a living Scopelogadus ridgehead
Scopelogadus
† Scutella
Scyliorhinus
† Scymnorhinus
† Sebastodes
Seila
Semele – tentative report
Semele
Semicassis
Semicossyphus
Fossilized skull of the Pliocene porpoise Semirostrum
† Semirostrum – type locality for genus
- † Semirostrum ceruttii – type locality for species
† Sequoiadendron
† Serbelodon
Serica
Seriola
Seriphus
- † Seriphus politus
Serpula
Serpulorbis
Restoration of two species of the Oligocene oreodont mammal genus Sespia
† Sespia
Siderastrea
Sigmodon
Sigmoilina – tentative report
Siliqua
- † Siliqua patula – or unidentified related form
Sinum
Siphonalia
Skenea
- † Skenea californica
† Smilax
Life restoration of the Pleistocene-Holocene saber-tooth cat Smilodon
† Smilodon
- † Smilodon fatalis
- † Smilodon gracilis
† Smilodonichthys
Solariella
- † Solariella peramabilis
Solemya
Solen
Solenosteira
Sorex
Spermophilus
- A living Otospermophilus beecheyi (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
Mounted fossilized skeleton of the Pliocene-Pleistocene elephant relative Stegomastodon
† 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
Mounted fossilized skeleton of the fossil pronghorn Stockoceros
† Stockoceros – or unidentified comparable form
Stomias
Stramonita
- † Stramonita biserialis
- † Stramonita canaliculata
† Striatolamia
Strioterebrum
Strombiformis
Strombus
- † Strombus galeatus
- † Strombus gracilior
Strongylocentrotus
† Strongylodon
Sturnella
Mounted fossilized skeleton of the Eocene-Oligocene tortoise Stylemys
† Stylemys
Subcancilla
- † Subcancilla sulcata
† Subhyracodon
Succinea
Sula
† Syllomus – or unidentified comparable form
Sylvilagus
- † Sylvilagus audubonii
- † Sylvilagus bachmani
- † Sylvilagus floridanus
A living Syngnathus pipefish
Syngnathus
Synthliboramphus
- † Synthliboramphus antiquus
- † Synthliboramphus hypoleucus
† Tabernaemontana
Tadorna
- † Tadorna tadorna
Tagelus
- † Tagelus californianus
- † Tagelus subteres
Tamias
Tamiasciurus
- † Tamiasciurus hudsonicus
† Tanymykter
A living Tapirus , or tapir
Tapirus
- † Tapirus californicus
- † Tapirus merriami – type locality for species
† Tapocyon
Taranis
Taricha
Taxidea
- † Taxidea taxus
Tayassu
Tegula
- † Tegula aureotincta
- † Tegula eiseni
- † Tegula ligulata
Restoration of the Miocene-Pliocene rhinoceros Teleoceras
† Teleoceras
Tellina
† Temnocyon
Tenagodus
† Teratornis
- † Teratornis merriami
Terebellum
Terebra
- † Terebra pedroana
- † Terebra protexta
Terebratula
Teredo
Terminalia
† Tessarolax – tentative report
Testudo
† Tetraclaenodon
† Tetrameryx
Thais
Life restoration of the Miocene fur seal Thalassoleon
† 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
Mounted fossilized skeleton of the Miocene-Pleistocene camel Titanotylopus
† Titanotylopus
Tivela
- † Tivela stultorum
† Tomarctus
- † Tomarctus brevirostris
- † Tomarctus hippophaga
Totanus
† Toxicodendron
Toxopneustes
- † Toxopneustes roseus – or unidentified comparable form
Toxostoma
- † Toxostoma redivivum
Trachycardium
A living Tremarctos , or spectacled bear
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
Shell of a Turcica sea snail
Turcica
- † Turcica caffea
Turdus
†Turio
Turricula
Turris
Turritella
Turritriton
- † Turritriton gibbosus
Tursiops – or unidentified comparable form
Typha
Typhis
Tyto
- † Tyto (sp.)
Uca
Life restoration of the Eocene mammal Uintatherium
† Uintatherium
Ulmus
† Umbellularia
Uria
- † Uria aalge
† Urobatis
- † Urobatis halleri
† Urocitellus
- † Urocitellus beldingi
Urocyon
- † Urocyon cinereoargenteus
Urolophus
- † Urolophus halleri – tentative report
Ursus
- A living Ursus americanus , or American black bear
  † 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
Leaves and fruit of a living Viburnum .
† Viburnum
† Vireo
Vitrinella – tentative report
Volsella
Voluta
Volutopsius
† Vouapa
Vulpes
- † Vulpes cascadensis
- † Vulpes velox
Williamia
† Wodnika
Fossilized shell of the Late Cretaceous-modern carrier shell sea snail Xenophora
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
Known material diagram depicting the Miocene-Pleistocene mastodon relative Zygolophodon with a human to scale
† Zygolophodon

References

Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved August 7, 2017.

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