# 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.

## 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 alba
* 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