List of the Mesozoic life of California

This list of the Mesozoic life of California contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of California and are between 252.17 and 66 million years of age.

A
  • Diagram depicting the soft part anatomy of the sea snail Abyssochrysos
    †Abyssochrysos – tentative report
    • †Abyssochrysos giganteum – type locality for species
  • †Acaeniotyle
    • †Acaeniotyle umbilicata – or unidentified related form
  • †Acanthoceras
    • †Acanthoceras rhotomagense – or unidentified related form
    • †Acanthoceras roguense – or unidentified related form
    • †Acanthoceras sherborni – or unidentified comparable form
  • †Acanthocircus
    • †Acanthocircus aculeatus
    • †Acanthocircus carinatus – or unidentified related form
    • †Acanthocircus dendroacanthos
    • †Acanthocircus dicranocanthos
    • †Acanthocircus meyerhofforum
    • †Acanthocircus multidentatus
    • †Acanthocircus polymorphus
    • †Acanthocircus suboblongus
    • †Acanthocircus trizonalis
  • Acanthosphaera – tentative report
    • †Acanthosphaera lucida
  • †Acastea
    • †Acastea acer
    • †Acastea bipes
    • †Acastea dura
    • †Acastea incontraria
    • †Acastea remusa
    • †Acastea tenuis
  • Acesta
  • Acharax
    • †Acharax stantoni
  • Acila
    • †Acila demessa
    • †Acila princeps
  • †Acrioceras
    • †Acrioceras hamlini
    • †Acrioceras vespertinum
  • Fossilized teeth of the Permian-Paleocene cartilaginous fish Acrodus
    †Acrodus
    • †Acrodus wempliae – type locality for species
  • †Acteon
    • †Acteon inornatus
    • †Acteon politus
    • †Acteon sullivanae
  • †Acteonella
    • †Acteonella oviformis
  • †Acteonina
    • †Acteonina berryessensis – type locality for species
    • †Acteonina californica
    • †Acteonina columnaris
  • †Acusten
    • †Acusten ordinarius
  • †Adelodonax
    • †Adelodonax altus
  • †Aechmella
  • †Agnomyax
    • †Agnomyax monilifer
  • †Aguileria – or unidentified comparable form
  • †Alarimella
    • †Alarimella anae – type locality for species
    • †Alarimella veta
  • Life restoration of the Late Cretaceous armored dinosaur Aletopelta
    †Aletopelta – type locality for genus
    • †Aletopelta coombsi – type locality for species
  • †Alievium
    • †Alievium antiquum
  • Amauropsis
    • †Amauropsis pseudoalveata
  • †Ambercyclus
    • †Ambercyclus dilleri
    • †Ambercyclus morganensis
  • †Amphidonte
    • †Amphidonte parasitica
  • Fossilized shell of the Jurassic-Miocene sea snail Ampullina
    †Ampullina
    • †Ampullina avellana
    • †Ampullina concipio
    • †Ampullina mona
    • †Ampullina oviformis
    • †Ampullina packardi
    • †Ampullina stantoni
  • Amuletum
  • †Anagaudryceras
    • †Anagaudryceras mikobokense
    • †Anagaudryceras sacya – or unidentified comparable form
  • †Anahamulina
    • †Anahamulina wilcoxensis
  • †Anarhynchia
    • †Anarhynchia gabbi – or unidentified comparable form
  • †Anasibirites
    • †Anasibirites desertorum
    • †Anasibirites kingianus – type locality for species
    • †Anasibirites lindgreni
  • †Anatomites
    • †Anatomites adalberti
    • †Anatomites damesi
    • †Anatomites edgari
    • †Anatomites externiplicatus
    • †Anatomites intermittens
    • †Anatomites konnincki
    • †Anatomites mendenhalli
    • †Anatomites obsoletus – type locality for species
    • †Anatomites shastensis – type locality for species
    • †Anatomites subintermittens – type locality for species
  • †Anatropites
    • †Anatropites hauchecornei
  • †Anchura
    • †Anchura ainikta – type locality for species
    • †Anchura baptos – type locality for species
    • †Anchura californica
    • †Anchura callosa
    • †Anchura condoniana
    • †Anchura falciformis
    • †Anchura gibbera
    • †Anchura halberdopsis – type locality for species
    • †Anchura phaba – type locality for species
  • †Anglonautilus
    • †Anglonautilus catarinae
  • †Angulobracchia
    • †Angulobracchia bulbosa
    • †Angulobracchia jasperensis
    • †Angulobracchia ozvoldovae
    • †Angulobracchia purisimaensis
  • †Anisoceras
    • †Anisoceras draconum
  • †Anisomyon
    • †Anisomyon meeki
  • †Anomalina
    • †Anomalina pseudopopillosa
  • Interior and exterior of a shell of an Anomia, or jingle shell
    †Anomia
    • †Anomia – type locality for species A – informal
    • †Anomia jalama
    • †Anomia lineata
  • †Anoplophora – tentative report
    • †Anoplophora shastensis – type locality for species
  • †Anthonya
    • †Anthonya cultriformis
  • †Aphaea
    • †Aphaea ignota
  • †Aphanoptyxis
    • †Aphanoptyxis andersoni
    • †Aphanoptyxis californica – type locality for species
  • †Aphrodina
    • †Aphrodina varians
  • †Aphrosaurus
    • †Aphrosaurus furlongi
  • Multiple views of a shell of an Aporrhais pelican foot sea snail
    Aporrhais
    • †Aporrhais veta – type locality for species
  • †Archaeocenosphaera
    • †Archaeocenosphaera ruesti – or unidentified related form
  • †Archaeodictyomitra
    • †Archaeodictyomitra apiarium
    • †Archaeodictyomitra inornata
    • †Archaeodictyomitra oleadita
    • †Archaeodictyomitra rigida
    • †Archaeodictyomitra simplex
    • †Archaeodictyomitra siplex
    • †Archaeodictyomitra sliteri
    • †Archaeodictyomitra vulgaris
  • †Archaeohagiastrum
    • †Archaeohagiastrum minutum – or unidentified related form
  • Archaeolithothamnium
  • †Archaeopus
    • †Archaeopus antennatus
  • †Archaeospongoprunum
    • †Archaeospongoprunum carrierensis
    • †Archaeospongoprunum cortinaensis
    • †Archaeospongoprunum elegans – or unidentified related form
    • †Archaeospongoprunum imlayi
    • †Archaeospongoprunum klingi
    • †Archaeospongoprunum macrostylum – or unidentified related form
    • †Archaeospongoprunum praeimlayi
    • †Archaeospongoprunum praelongum
    • †Archaeospongoprunum tehamaensis
  • A living Architectonica staircase shell sea snail
    Architectonica – tentative report
  • Arcopagia
    • †Arcopagia tehama
  • Arctica
    • †Arctica anthracocola
    • †Arctica denmanensis – or unidentified related form
  • †Arctoceras
    • †Arctoceras tuberculatum
  • †Areaseris
    • †Areaseris nevadensis
  • Argyrotheca
    • †Argyrotheca retrorsa – type locality for species
  • Fossilized shell of the Early Jurassic ammonoid cephalopod Arnioceras
    †Arnioceras
  • †Arpadites
    • †Arpadites kingi – type locality for species
  • Arrhoges
    • †Arrhoges californicus
  • †Aspenites – type locality for genus
    • †Aspenites acutus
  • Astarte
    • †Astarte sulcata – tentative report
    • †Astarte sulcuta
    • †Astarte tuscana
  • †Asteroceras
  • †Astrocoenia – report made of unidentified related form or using admittedly obsolete nomenclature
  • Ataphrus
    • †Ataphrus compactus – tentative report
  • †Atira
  • †Atractites
    • †Atractites philippii – type locality for species
  • †Atresius
    • †Atresius liratus
  • †Aucellina – tentative report
  • Fossilized partial skull of the Late Cretaceous duck-billed dinosaur Augustynolophus
    †Augustynolophus
    • †Augustynolophus morrisi
  • Avicula
    • †Avicula mucronata – type locality for species
    • †Avicula soperi – type locality for species
  • †Axonoceras

B
  • †Bacchites
    • †Bacchites hyatti – type locality for species
    • †Bacchites pinguis
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Baculites
    †Baculites
    • †Baculites anceps
    • †Baculites bailyi – or unidentified comparable form
    • †Baculites buttensis – type locality for species
    • †Baculites capensis
    • †Baculites chicoensis
    • †Baculites fairbanksi
    • †Baculites inornatus
    • †Baculites lomaensis
    • †Baculites occidentalis
    • †Baculites recta – or unidentified comparable form
    • †Baculites rex – type locality for species
    • †Baculites schencki – type locality for species
    • †Baculites yokoyamai – or unidentified comparable form
  • †Bagotum
    • †Bagotum modestum
  • †Balantiostoma – tentative report
  • Barbatia
  • †Barrettia
    • †Barrettia sparcilirata
  • Mounted fossilized skeleton of the Cretaceous turtle Basilemys
    †Basilemys
  • †Bathypurpurinopsis
    • †Bathypurpurinopsis stantoni – type locality for species
  • † Belleza
    • †Belleza decora
  • †Belliscala
    • †Belliscala meta
  • Bernaya
    • †Bernaya argonautica – type locality for species
    • †Bernaya berryessae – type locality for species
    • †Bernaya crawfordcatei – type locality for species
    • †Bernaya gualalaensis – type locality for species
    • †Bernaya jeanae – type locality for species
    • †Bernaya kayei – or unidentified related form
    • †Bernaya louellasaulae – type locality for species
    • †Bernaya popenoei – type locality for species
    • †Bernaya rineyi – type locality for species
  • †Bernoullius
    • †Bernoullius brokenkettlensis
    • †Bernoullius cristatus
    • †Bernoullius delnortensis
    • †Bernoullius dicera
    • †Bernoullius irwini
  • †Beudanticeras
    • †Beudanticeras alamoense – type locality for species
    • †Beudanticeras argonauticum – type locality for species
    • †Beudanticeras breweri
    • †Beudanticeras brewerii – or unidentified related form
    • †Beudanticeras haydeni
  • †Bipedis – tentative report
  • †Biplica
    • †Biplica heteroplicata
    • †Biplica isoplicata
    • †Biplica michaeli – or unidentified related form
    • †Biplica miniplicata
    • †Biplica multiplicata
    • †Biplica obliqua
  • †Bistarkum
  • †Bittiscala
  • †Bivallupus
    • †Bivallupus mexicanus
  • †Bochianites
    • †Bochianites paskentaensis
  • †Bolena
    • †Bolena zancajosa
  • †Bositra
    • †Bositra buchi
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Bostrychoceras
    †Bostrychoceras
    • †Bostrychoceras brewerii
    • †Bostrychoceras californicum – type locality for species
    • †Bostrychoceras declive
    • †Bostrychoceras occidentale – type locality for species
    • †Bostrychoceras otsukai – or unidentified related form
  • †Brancoceras
    • †Brancoceras parvum
  • †Brasilichnium
  • †Buchia
    • †Buchia concentrica – or unidentified comparable form
    • †Buchia elderensis
    • †Buchia keyserlingi
    • †Buchia pacifica
    • †Buchia piochii
    • †Buchia terebratuloides
    • †Buchia trigonoides
  • †Bulbificopsis – type locality for genus
    • †Bulbificopsis garza – type locality for species
  • Bulimina
    • †Bulimina obtusa
  • A living Bulimulus land snail
    Bulimulus
  • †Bullamirifica
    • †Bullamirifica ainiktos
    • †Bullamirifica elegans
  • Bullaria
    • †Bullaria nortonensis
  • Bullina
    • †Bullina yoloensis – type locality for species
  • †Butticeras
    • †Butticeras studleyi – type locality for species

C
  • †Califadesma
    • †Califadesma elaphium
  • †Californigonia – type locality for genus[1]
    • †Californigonia plumasensis – type locality for species. Formerly classified as Trigonia plumasensis.[1]
  • †Californites – type locality for genus
    • †Californites careyi – type locality for species
    • †Californites merriami – type locality for species
  • Restoration of the Late Triassic ichthyosaur Californosaurus
    †Californosaurus
  • Callianassa – tentative report
  • †Calliconites
    • †Calliconites drakei – type locality for species
  • †Calliomphalus – tentative report
  • Callista – tentative report
    • †Callista pseudoplana – or unidentified related form
    • †Callista subtrigona
  • †Callistalox
    • †Callistalox fragilis
  • †Calva
    • †Calva crassa
    • †Calva elderi
    • †Calva nitida
    • †Calva peninsularis
    • †Calva spissa
    • †Calva taffi
    • †Calva varians
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Calycoceras
    †Calycoceras
    • †Calycoceras naviculare
  • †Camptonectes
    • †Camptonectes curvatus – or unidentified comparable form
  • †Canadoceras
    • †Canadoceras celeste – type locality for species
    • †Canadoceras fraternum
    • †Canadoceras mysticum
    • †Canadoceras newberryanum
    • †Canadoceras subtilobatum – or unidentified related form
  • Cancellaria – tentative report
  • †Canelonus
    • †Canelonus conus
  • †Caneta
    • †Caneta hsui
  • †Canoptum
    • †Canoptum anulatum
    • †Canoptum poissoni
    • †Canoptum rugosum
  • Cantharus
    • †Cantharus occidentalis
  • †Canutus
    • †Canutus giganteus
    • †Canutus rockfishensis
  • Shells of modern Capulus cap sea snails
    Capulus – or unidentified comparable form
    • †Capulus silverthorni – type locality for species
  • Cardinia
    • †Cardinia gleimi – type locality for species
  • †Cardiomorpha – tentative report
    • †Cardiomorpha digglesi – type locality for species
  • Cardita
    • †Cardita jenkinsi – type locality for species
  • †Cassideus
    • †Cassideus yoloensis
  • †Cecrops
    • †Cecrops septemporata
    • †Cecrops septemporatus
  • †Celtites
    • †Celtites steindachneri
  • Cenodiscus
    • †Cenodiscus alievi
  • Cenosphaera
    • †Cenosphaera boria
  • †Ceriostella
    • †Ceriostella martini
  • Cerithidea
  • Two views of a Cerithium cerith sea snail
    Cerithium
    • †Cerithium alternata
    • †Cerithium totiumsanctorum – or unidentified comparable form
  • †Choristoceras
    • †Choristoceras klamathense – type locality for species
    • †Choristoceras marshi
  • †Christitys – type locality for genus
    • †Christitys delta – type locality for species
    • †Christitys martini – or unidentified comparable form
    • †Christitys medica – type locality for species
  • †Cidarina
    • †Cidarina beta – type locality for species
    • †Cidarina cretacea – type locality for species
  • Shell and spines of a Cidaris sea urchin
    Cidaris
    • †Cidaris californicus
    • †Cidaris plumasensis
    • †Cidaris taylorensis
  • †Cladoceramus
    • †Cladoceramus undulatoplicatus
  • †Clinura
    • †Clinura anassa
  • †Clisocolus
    • †Clisocolus cordatus
    • †Clisocolus corrugatus
    • †Clisocolus dubius
  • Fossilized shell of the Late Cretaceous ammonoid Collignoniceras
    †Collignoniceras
    • †Collignoniceras bakeri
  • †Collonia
    • †Collonia occidentalis – type locality for species
  • †Cophocara
    • †Cophocara stantoni
  • †Coralliochama
    • †Coralliochama orcutti
  • Corbicula
    • †Corbicula astartoides
  • Corbula
    • †Corbula cancellifera
    • †Corbula parilis
    • †Corbula pozo
    • †Corbula torta – or unidentified comparable form
    • †Corbula traski
    • †Corbula traskii
  • Cornutella
  • †Cosmonautilus
    • †Cosmonautilus dilleri
    • †Cosmonautilus hersheyi – type locality for species
    • †Cosmonautilus pacificus – type locality for species
    • †Cosmonautilus shastensis – type locality for species
  • †Costispiriferina
    • †Costispiriferina pittensis
  • †Courtilloticeras
    • †Courtilloticeras stevensi – type locality for species
  • Crassatella
    • †Crassatella conradiana
    • †Crassatella mercedensis – tentative report
    • †Crassatella saulae
    • †Crassatella triangulata
    • †Crassatella triangulatus
  • †Crassatellina
    • †Crassatellina saulae
  • Fossilized shell of the Early Cretaceous ammonoid cephalopod Crioceratites
    †Crioceratites
    • †Crioceratites latus
    • †Crioceratites tehamaensis – or unidentified comparable form
  • †Crolanium
    • †Crolanium triquetrum
  • †Crucella
    • †Crucella linda
    • †Crucella magna
    • †Crucella messinae
    • †Crucella theokaftensis
  • Cucullaea
    • †Cucullaea alamoensis – type locality for species
    • †Cucullaea bowersiana
    • †Cucullaea gravida
    • †Cucullaea truncata
    • †Cucullaea youngi
  • †Cunningtoniceras
    • †Cunningtoniceras meridionale – or unidentified related form
  • †Cyclothyris
    • †Cyclothyris densleonis
  • Cylichna
    • †Cylichna andersoni
  • †Cylindroteuthis
  • Fossilized shell of the Late Jurassic-Oligocene nautiloid cephalopod Cymatoceras
    †Cymatoceras
    • †Cymatoceras carlottense
    • †Cymatoceras hermosus – type locality for species
  • †Cymbophora
    • †Cymbophora asburnerii
    • †Cymbophora ashburnensis – or unidentified related form
    • †Cymbophora ashburnerii
    • †Cymbophora bella – or unidentified comparable form
    • †Cymbophora gabbiana
    • †Cymbophora popenoei
    • †Cymbophora stantoni
    • †Cymbophora tenuissima
    • †Cymbophora triangula
    • †Cymbophora triangulata
  • Life restoration of the Middle-Late Triassic ichthyosaur Cymbospondylus
    †Cymbospondylus
    • †Cymbospondylus petrinus
  • †Cymulopora – tentative report
  • †Cyprimeria
    • †Cyprimeria moorei
  • Cyrtocapsa – tentative report
    • †Cyrtocapsa kisoensis – or unidentified related form

D
  • †Damesites
    • †Damesites damesi
    • †Damesites frazierense
    • †Damesites gardeni – or unidentified related form
    • †Damesites hetonaiensis
    • †Damesites richardsoni – type locality for species
    • †Damesites subsugatum
  • Fossilized shell of the Middle-Late Triassic marine bivalve Daonella
    †Daonella – tentative report
    • †Daonella dubia
  • †Darvelus
    • †Darvelus pessagnoi – type locality for species
    • †Darvelus primus – type locality for species
  • Dentalina
    • †Dentalina legumen
  • †Dentalium
    • †Dentalium cooperi
    • †Dentalium nanaimoense
    • †Dentalium whiteavesi
  • Fossilized shells of the Early Cretaceous ammonoid cephalopod Desmoceras
    †Desmoceras
    • †Desmoceras alamoense – or unidentified comparable form
    • †Desmoceras argonauticum – or unidentified comparable form
    • †Desmoceras dawsoni
    • †Desmoceras inane
    • †Desmoceras japonicum
    • †Desmoceras voyi
  • †Desmophyllites
    • †Desmophyllites diphylloides – type locality for species
  • †Deviatus
    • †Deviatus deweveri
    • †Deviatus hipposidericus
  • †Diacanthocapsa
  • †Dicerosaturnalis
    • †Dicerosaturnalis dicranacanthos
  • †Dicroa
  • †Dicroloma
    • †Dicroloma nodosa
  • †Dictyoconites
    • †Dictyoconites americanus – type locality for species
  • †Dictyomitra
  • †Dictyomitrella
    • †Dictyomitrella kamoensis
  • Restoration of several species of the Late Cretaceous ammonoid cephalopod Didymoceras
    †Didymoceras
    • †Didymoceras hornbyense – or unidentified comparable form
    • †Didymoceras vancouverense – or unidentified comparable form
    • †Didymoceras vancouverensis
  • †Dieneria – type locality for genus
    • †Dieneria arthaberi – type locality for species
  • †Dieneroceras
    • †Dieneroceras dieneri – type locality for species
    • †Dieneroceras marcoui – type locality for species
    • †Dieneroceras spathi
    • †Dieneroceras subquadratum
  • †Dillerites – type locality for genus
    • †Dillerites shastensis – type locality for species
  • †Dimyodon
    • †Dimyodon storrsi – type locality for species
  • †Diozoptyxis
    • †Diozoptyxis ursana – type locality for species
  • Diplodonta
    • †Diplodonta davisi
  • †Diplomoceras
    • †Diplomoceras ellipticum
    • †Diplomoceras jimboi – type locality for species
    • †Diplomoceras mustangense – type locality for species
  • †Discohelix – tentative report
    • †Discohelix leana
  • †Discophyllites
    • †Discophyllites patens
  • †Discoproptychites
    • †Discoproptychites walcotti – type locality for species
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Discoscaphites
    †Discoscaphites
  • †Discotropites
    • †Discotropites davisi – type locality for species
    • †Discotropites formosus – type locality for species
    • †Discotropites laurae
    • †Discotropites lineatus
    • †Discotropites mojsvarensis
    • †Discotropites plinii
    • †Discotropites sandlingensis
    • †Discotropites sengeli
    • †Discotropites smithi
    • †Discotropites theron
  • †Distichophyllia
    • †Distichophyllia norica
  • Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Douvilleiceras
    †Douvilleiceras
    • †Douvilleiceras mammillatum – or unidentified comparable form
  • †Drepanochilus
    • †Drepanochilus transversus
  • †Drilluta – tentative report
  • †Droltus
  • †Dumitricaella – tentative report
    • †Dumitricaella cucurbitina – or unidentified related form
  • †Durania
    • †Durania californica – type locality for species

E
  • †Echinocorys
    • †Echinocorys yoloensis – type locality for species
  • †Elimia
    • †Elimia veatchii
  • †Ellipsoscapha
    • †Ellipsoscapha nortonensis – or unidentified comparable form
    • †Ellipsoscapha skaios
  • †Emiluvia
    • †Emiluvia chica
    • †Emiluvia dollarbendensis
    • †Emiluvia fontana
    • †Emiluvia hopsoni
    • †Emiluvia lowercoonensis
    • †Emiluvia nana
    • †Emiluvia pessagnoi
    • †Emiluvia premyogii
  • Restoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring"
    †Enchodus
  • †Endoptygma
    • †Endoptygma hermax – type locality for species
  • †Entobia
  • †Entolium
    • †Entolium equabile
    • †Entolium meeki
    • †Entolium pittensis – type locality for species
  • †Eocomoseris
    • †Eocomoseris ramosa
  • †Eocypraea
    • †Eocypraea louellae – type locality for species
  • †Eodanubites
    • †Eodanubites judae – type locality for species
  • †Eogaudryceras
    • †Eogaudryceras wintunius
  • †Eogunnarites
    • †Eogunnarites matsumotoi
  • †Eospongosaturninus
    • †Eospongosaturninus protoformis
  • †Eripachla
    • †Eripachla ponderosa
  • †Eripachya
    • †Eripachya ponderosa
  • †Eriphyla
    • †Eriphyla lapida
    • †Eriphyla lapidus
    • †Eriphyla umbonata
  • †Etea
    • †Etea occidentalis
  • †Eucalycoceras
    • †Eucalycoceras diabloense – type locality for species
  • Illustration of the fossilized skull of the sea turtle Euclastes
    †Euclastes
  • †Eucymatoceras
    • †Eucymatoceras plicatum
  • †Eucyrtidiellum
    • †Eucyrtidiellum ptyctum
    • †Eucyrtidiellum takemurai
    • †Eucyrtidiellum unumaense
  • †Eucyrtidium – tentative report
  • †Euidothyris
    • †Euidothyris lucerna – type locality for species
  • †Euomphaloceras
    • †Euomphaloceras septemseriatum
  • †Eupachydiscus
    • †Eupachydiscus arbucklensis – type locality for species
    • †Eupachydiscus haradai
    • †Eupachydiscus lamberti – or unidentified related form
    • †Eupachydiscus willgreeni – type locality for species
  • †Euspira
    • †Euspira compressa
    • †Euspira marianus
    • †Euspira popenoei
    • †Euspira shumardiana
  • †Eutrephoceras
    • †Eutrephoceras campbelli
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Exiteloceras
    †Exiteloceras
    • †Exiteloceras bennisoni – type locality for species
    • †Exiteloceras desertense – type locality for species
    • †Exiteloceras diabloense – tentative report
    • †Exiteloceras ortigalitoense – type locality for species
    • †Exiteloceras vancouverense
  • †Exogyra

F
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Fagesia
    †Fagesia
    • †Fagesia catinus – type locality for species
    • †Fagesia klamathensis – type locality for species
  • Fissurella – tentative report
  • †Flabellina
    • †Flabellina pilulifera
  • †Flabellirhynchia
    • †Flabellirhynchia concinna – type locality for species
    • †Flabellirhynchia falconis – type locality for species
  • †Flabellum
    • †Flabellum fresnoense – type locality for species
  • †Flaventia
    • †Flaventia lens
  • †Foremanina
  • †Francisciconcha
    • †Francisciconcha maslennikovi
  • †Fresnosaurus – type locality for genus
    • †Fresnosaurus drescheri – type locality for species
  • Frondicularia
    • †Frondicularia undulosa – or unidentified comparable form

G
  • †Gabbioceras
    • †Gabbioceras angulatum
  • †Garzasia
    • †Garzasia diabla
    • †Garzasia intermedia – or unidentified comparable form
  • Gastrochaena – tentative report
  • Fossilized shell of the Cretaceous ammonoid cephalopod Gaudryceras
    †Gaudryceras
    • †Gaudryceras alamedense
    • †Gaudryceras aureum – type locality for species
    • †Gaudryceras cinctum – or unidentified related form
    • †Gaudryceras debnabebse – or unidentified comparable form
    • †Gaudryceras denmanense – or unidentified comparable form
    • †Gaudryceras kayei – type locality for species
    • †Gaudryceras tenuiliratum – tentative report
    • †Gaudryceras texanum – type locality for species
  • †Gervillia
    • †Gervillia shastensis
  • Glans – tentative report
    • †Glans veneriformis
  • †Glauconia
  • †Globigerinelloides
  • †Globirhynchia
    • †Globirhynchia gnathophora – type locality for species
    • †Globirhynchia oblatopinguis – type locality for species
    • †Globirhynchia rhacta – type locality for species
    • †Globirhynchia schucherti – type locality for species
  • Glossus
    • †Glossus delta
  • Fossilized shell of a Glycymeris, or bittersweet clam
    Glycymeris
    • †Glycymeris anae
    • †Glycymeris apletos
    • †Glycymeris banosensis – type locality for species
    • †Glycymeris pacifica – or unidentified comparable form
    • †Glycymeris pacificus
    • †Glycymeris shastensis – type locality for species
    • †Glycymeris suciensis
    • †Glycymeris veatchii
    • †Glycymeris yoloensis
  • †Glyptoxoceras
    • †Glyptoxoceras largesulcatum – or unidentified comparable form
    • †Glyptoxoceras subcompressum – or unidentified comparable form
  • †Gnathorhynchia
    • †Gnathorhynchia perplicata – type locality for species
  • †Gnomohalorites
    • †Gnomohalorites americanus
  • Gongylothorax
    • †Gongylothorax oblongus – or unidentified related form
  • †Goniojuvavites
    • †Goniojuvavites kellyi – type locality for species
  • †Gonionotites
    • †Gonionotites northi – type locality for species
  • †Gorgansium
    • †Gorgansium pulchrum
  • †Goricanites – type locality for genus
    • †Goricanites noblei – type locality for species
  • Fossil negative with skin impressions of the theropod dinosaur footprint ichnogenus Grallator
    †Grallator
  • †Grammatodon
    • †Grammatodon vancouverensis
  • †Gryphaea
  • †Gryponautilus
    • †Gryponautilus cooperi – type locality for species
  • †Guexella
  • †Guineana
    • †Guineana alta
  • †Guodunites
    • †Guodunites hooveri – type locality for species
  • †Gymnotropites
    • †Gymnotropites americanus – type locality for species
    • †Gymnotropites laevis – type locality for species
    • †Gymnotropites rotundus – type locality for species
  • Gyrodes
    • †Gyrodes allisoni
    • †Gyrodes californicus
    • †Gyrodes canadensis
    • †Gyrodes conradiana
    • †Gyrodes dowelli
    • †Gyrodes expansa
    • †Gyrodes expansus
    • †Gyrodes greeni – type locality for species
    • †Gyrodes pacificum
    • †Gyrodes pacificus – or unidentified comparable form
    • †Gyrodes quercus
  • Gyroidina
    • †Gyroidina depressa

H
  • A living Haliotis, or abalone
    Haliotis
  • †Halobia
    • †Halobia austriaca
    • †Halobia cordillerana
    • †Halobia gigantea
    • †Halobia ornatissima
    • †Halobia rugosa
    • †Halobia superba
  • †Hauericeras
    • †Hauericeras angustum
    • †Hauericeras churchi – type locality for species
    • †Hauericeras mickeyi – type locality for species
  • †Hauerites
    • †Hauerites lawsoni – type locality for species
  • †Haydenia
    • †Haydenia impressa
  • †Hecticoceras
  • Fossilized shell of the Triassic ammonoid cephalopod Hedenstroemia
    †Hedenstroemia
    • †Hedenstroemia kossmati
  • †Helena
    • †Helena exquisita
  • †Helicaulax
    • †Helicaulax popenoei – type locality for species
  • Hemiaster
    • †Hemiaster californicus
  • †Hemicidaris
    • †Hemicidaris intumescens
  • †Hemicryptocapsa
    • †Hemicryptocapsa ruesti – or unidentified related form
  • Modern individual of the Cretaceous-modern cow shark genus Heptranchias
    Heptranchias
  • †Hertleinites
    • †Hertleinites aguila
    • †Hertleinites pecki
  • †Heteroderma
  • †Hexasaturnalis
    • †Hexasaturnalis hexagonus
  • †Hexasphaera
    • †Hexasphaera baumgartneri
  • †Higumastra
    • †Higumastra boucoti
    • †Higumastra devilsgapensis
    • †Higumastra dumitricai
    • †Higumastra imbricata
    • †Higumastra inflata – or unidentified related form
    • †Higumastra transversa
  • †Hilarisirex
  • Shell of a Hipponix, or hoof sea snail
    Hipponix
    • †Hipponix dichotomus
  • †Hiscocapsa
    • †Hiscocapsa acuta
    • †Hiscocapsa japonica – or unidentified comparable form
    • †Hiscocapsa robusta
  • †Hokkaidoconcha
    • †Hokkaidoconcha bilirata – type locality for species
    • †Hokkaidoconcha morenoensis – type locality for species
    • †Hokkaidoconcha occidentalis
    • †Hokkaidoconcha tehamaensis – type locality for species
  • †Holcodiscoides
    • †Holcodiscoides gorrilli – type locality for species
  • †Holcophylloceras – tentative report
  • †Hollisites
    • †Hollisites inflatus
    • †Hollisites lucasi
  • †Holocryptocanium
    • †Holocryptocanium astiensis
    • †Holocryptocanium barbui
    • †Holocryptocanium geysersensis
    • †Holocryptocanium tuberculatum
  • †Homerites
    • †Homerites semiglobosus
  • †Homoeoparonaella
    • †Homoeoparonaella barbata
    • †Homoeoparonaella elegans
    • †Homoeoparonaella gigantea
    • †Homoeoparonaella glinesi
    • †Homoeoparonaella radians
    • †Homoeoparonaella scurrae
  • †Homolsomites
    • †Homolsomites mutabilis
  • †Hoplocrioceras
    • †Hoplocrioceras ducanense
    • †Hoplocrioceras duncanense
    • †Hoplocrioceras remondi
  • †Hoplotropites
    • †Hoplotropites jokelyi
  • †Hormathospongia – type locality for genus
    • †Hormathospongia dictyota – type locality for species
  • †Hsuum
    • †Hsuum baldfacense
    • †Hsuum brevicostatum
    • †Hsuum maxwelli
    • †Hsuum mclaughlini
    • †Hsuum naturale
    • †Hsuum obispoensis
    • †Hsuum rutogense
    • †Hsuum santamariaense
    • †Hsuum speciosum
  • Restoration of two of the Permian-Late Cretaceous cartilaginous fish Hybodus
    †Hybodus
    • †Hybodus shastensis – type locality for species
  • †Hydrotherosaurus – type locality for genus
    • †Hydrotherosaurus alexandrae – type locality for species
  • †Hyphantoceras
    • †Hyphantoceras ceratopse
    • †Hyphantoceras venustum – or unidentified comparable form
  • †Hypophylloceras
    • †Hypophylloceras onoense – or unidentified related form

I
  • †Icantia
  • Restoration of the Late Cretaceous toothed bird Ichthyornis
    †Ichthyornis
  • †Ichthyosaurus
    • †Ichthyosaurus californicus – type locality for species
    • †Ichthyosaurus franciscanus – type locality for species
  • †Igonoia
    • †Igonoia shastana
  • †Indonesites
    • †Indonesites sphaericus
  • Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
    †Inoceramus
    • †Inoceramus aduncas
    • †Inoceramus aduncus
    • †Inoceramus amakusensis – or unidentified comparable form
    • †Inoceramus angulatus – or unidentified comparable form
    • †Inoceramus balticus
    • †Inoceramus chicoensis – type locality for species
    • †Inoceramus cordiformis – or unidentified comparable form
    • †Inoceramus cymbaeformis – or unidentified related form
    • †Inoceramus digitatus – or unidentified related form
    • †Inoceramus ezoensis – or unidentified comparable form
    • †Inoceramus glennensis
    • †Inoceramus goldfussi – or unidentified comparable form
    • †Inoceramus gradilis
    • †Inoceramus incertus – or unidentified comparable form
    • †Inoceramus jacksonensis – type locality for species
    • †Inoceramus japonicus – or unidentified comparable form
    • †Inoceramus klamathensis
    • †Inoceramus naumanni
    • †Inoceramus pembertoni – or unidentified related form
    • †Inoceramus regularis – or unidentified related form
    • †Inoceramus shikotanensis – or unidentified comparable form
    • †Inoceramus stanislausensis
    • †Inoceramus steinmanni – or unidentified comparable form
    • †Inoceramus subundantus
    • †Inoceramus subundatus
    • †Inoceramus teshioensis – or unidentified comparable form
    • †Inoceramus turgidus – type locality for species
    • †Inoceramus vancouverensis
    • †Inoceramus whitneyi – or unidentified related form
  • †Inoperna
    • †Inoperna bellarugosa
  • †Inyoceras
    • †Inyoceras bittneri – type locality for species
    • †Inyoceras multicameratus – type locality for species
  • †Inyoites – type locality for genus
    • †Inyoites oweni – type locality for species
  • Isocrinus
    • †Isocrinus californicus
  • Fossilized shell of the Permian-modern marine bivalve Isognomon
    Isognomon
    • †Isognomon – type locality for species – informal

J
  • †Jeanbesseiceras – tentative report
    • †Jeanbesseiceras jacksoni
  • †Joaquinites – type locality for genus
    • †Joaquinites fascicostatum – type locality for species
  • †Jovites
    • †Jovites pacificus – type locality for species
  • Jupiteria
  • †Juvavites
    • †Juvavites knowltoni
    • †Juvavites subinterruptus
  • †Juvenites
    • †Juvenites dieneri – type locality for species

K
  • Fossilized shells of the Jurassic brachiopod Kallirhynchia
    †Kallirhynchia
    • †Kallirhynchia phylarchus – type locality for species
    • †Kallirhynchia valliculae – type locality for species
  • †Katroma
    • †Katroma neagui – or unidentified related form
  • †Keyserlingites
    • †Keyserlingites pacificus – type locality for species
    • †Keyserlingites subrobustus
  • †Kilianella
    • †Kilianella crassiplicata
  • †Kilinora
    • †Kilinora catenarum
    • †Kilinora spiralis
  • †Klamathites
    • †Klamathites kellyi
    • †Klamathites schucherti – type locality for species
  • Fossilized shell of the Early Cretaceous ammonoid cephalopod Kossmaticeras
    †Kossmaticeras
    • †Kossmaticeras japonicum – or unidentified related form
  • †Kozurium
    • †Kozurium corningensis
    • †Kozurium zingulai
  • †Kuhnastraea
    • †Kuhnastraea decussata

L
  • †Laballa
    • †Laballa suessi – or unidentified comparable form
  • †Lacunaria
    • †Lacunaria striata
  • †Lampasa
    • †Lampasa blomei
  • †Lanceolites – type locality for genus
    • †Lanceolites bicarinatus
    • †Lanceolites compactus
  • †Lanubus
  • Laternula – tentative report
    • †Laternula alisoensis
  • †Latidorsella
    • †Latidorsella barryae – type locality for species
  • †Latimaeandra – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Latimaeandra eucystis
  • †Leconteia – type locality for genus
    • †Leconteia californica – type locality for species
  • †Leconteiceras
    • †Leconteiceras occidentale – type locality for species
  • †Leconteites
    • †Leconteites lecontei – tentative report
  • Leda – tentative report
    • †Leda translucidus – tentative report
  • †Legumen
    • †Legumen ooides
  • †Leptosolen
  • †Leugeo
    • †Leugeo ordinarius
    • †Leugeo parvispinata
  • †Levileugeo
  • Lima
    • †Lima – type locality for species A – informal
    • †Lima beta
    • †Lima costata
    • †Lima kimballi – type locality for species
    • †Lima terqueni
  • Limopsis
    • †Limopsis silveradoensis
  • †Linaresia
  • †Linearis
    • †Linearis multicostata – or unidentified comparable form
  • †Lingula
  • †Lipmanium – tentative report
    • †Lipmanium caseyi
  • †Lisopithia
    • †Lisopithia ana
  • †Lispodesthes
    • †Lispodesthes rotundatus
    • †Lispodesthes rotundus
  • †Lithiotis
    • †Lithiotis problematica
  • †Lithomphalus
    • †Lithomphalus enderlini
  • Lithophaga
  • †Loboidothyris
    • †Loboidothyris meeki – type locality for species
    • †Loboidothyris mormonensis – type locality for species
  • †Longoconcha – tentative report
  • Fossilized shell of the Triassic-modern marine bivalve Lopha
    Lopha
  • Loripes – tentative report
    • †Loripes dubia
  • †Loxo
    • †Loxo decore
  • †Lucina
  • †Lyriochlamys
    • †Lyriochlamys traskii
  • †Lysis
    • †Lysis californica
    • †Lysis duplicosta
    • †Lysis suciensis – or unidentified comparable form
  • Fossilized shell of the Early Jurassic-Late Cretaceous ammonoid cephalopod Lytoceras
    †Lytoceras
    • †Lytoceras aulaeum
    • †Lytoceras batesi
    • †Lytoceras saturnale
    • †Lytoceras traski – or unidentified comparable form
    • †Lytoceras whitneyi

M
  • Macrocallista
    • †Macrocallista cordata – or unidentified related form
  • Fossilized shell of the Middle Jurassic ammonoid cephalopod Macrocephalites
    †Macrocephalites
  • †Madrasites
    • †Madrasites voyanum – type locality for species
  • †Mammites – tentative report
  • †Mantelliceras
    • †Mantelliceras lecontei – or unidentified comparable form
  • Margarella
    • †Margarella crenulata
  • †Margariella – tentative report
  • †Margaritella
    • †Margaritella globosa
  • Margarites
    • †Margarites inornatus
    • †Margarites ornatissima
    • †Margarites senilis
    • †Margarites septentrionalis – type locality for species
  • †Margaritropites
    • †Margaritropites johnsoni – type locality for species
    • †Margaritropites kokeni – type locality for species
  • †Marginotruncana
    • †Marginotruncana marginata
    • †Marginotruncana renzi
  • Marginulina
    • †Marginulina elongata
  • Fossilized shell of the Early-Late Cretaceous ammonoid cephalopod Mariella
    †Mariella
    • †Mariella bergeri
    • †Mariella fricki
  • Martesia
    • †Martesia clausa
  • †Mataxa
    • †Mataxa arida – type locality for species
  • †Mediaster
    • †Mediaster hayi – type locality for species
  • †Meekia
    • †Meekia bella
    • †Meekia daileyi
    • †Meekia iberica
    • †Meekia lirata – tentative report
    • †Meekia louella
    • †Meekia mygale
    • †Meekia radiata
    • †Meekia sella
    • †Meekia takeoana – tentative report
  • †Meekoceras
    • †Meekoceras gracilitatis
    • †Meekoceras newberryi
    • †Meekoceras strongi
  • †Melchiorites
    • †Melchiorites shastensis
  • Assemblage of fossilized shells of the Late Cretaceous ammonoid cephalopod Menuites
    †Menuites
    • †Menuites arrialoorensis – or unidentified related form
    • †Menuites siskiyouensis
  • †Merriamia
    • †Merriamia zitteli
  • †Mesopuzosia
    • †Mesopuzosia colusaense
    • †Mesopuzosia intermedia – or unidentified comparable form
    • †Mesopuzosia pacifica – or unidentified comparable form
  • †Metacerithium – tentative report
  • †Metaplacenticeras
    • †Metaplacenticeras californicum
    • †Metaplacenticeras pacificum
    • †Metaplacenticeras transitionale
  • †Metasibirites
    • †Metasibirites brockensis – type locality for species
    • †Metasibirites coei – type locality for species
    • †Metasibirites frechi – type locality for species
    • †Metasibirites gracilis – type locality for species
    • †Metasibirites modestus – type locality for species
    • †Metasibirites mojsvarensis – type locality for species
    • †Metasibirites pusillus – type locality for species
    • †Metasibirites pygmaeus – type locality for species
    • †Metasibirites shastensis – type locality for species
  • †Metatirolites
    • †Metatirolites foliaceus
    • †Metatirolites quadrangulus
    • †Metatirolites subpygmaeus
  • †Microsciadiocapsa
    • †Microsciadiocapsa sutterensis
  • †Microtropites
    • †Microtropites tubercularis
  • †Millerocaulis
    • †Millerocaulis embreei – type locality for species
  • †Minasteria – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Minasteria shastensis
  • †Minocapsa
    • †Minocapsa aitai
    • †Minocapsa tansinhoki
  • †Minytropis
    • †Minytropis melilota
  • †Mirifusus
    • †Mirifusus baileyi
    • †Mirifusus chenodes – or unidentified related form
    • †Mirifusus fragilis
    • †Mirifusus guadalupensis
    • †Mirifusus mediodilatatus
  • † Mita – tentative report
  • † Mita
    • †Mita magnifica
  • †Modiolus
    • †Modiolus cylindricus
    • †Modiolus sikiyouensis
    • †Modiolus siskiyouensis
  • †Mojsvaroceras
    • †Mojsvaroceras turneri – type locality for species
  • †Monotis
    • †Monotis subcircularis
  • †Morenosaurus – type locality for genus
    • †Morenosaurus stocki – type locality for species
  • Fossilized shell of the Early Cretaceous ammonoid cephalopod Mortoniceras
    †Mortoniceras
    • †Mortoniceras chicoense
    • †Mortoniceras gainesana
    • †Mortoniceras inflata
    • †Mortoniceras kiliani
    • †Mortoniceras tehamaensis
  • †Msopuzosia
    • †Msopuzosia densicostata – or unidentified comparable form
  • †Murphitys – type locality for genus
    • †Murphitys corona – type locality for species
    • †Murphitys madonna – type locality for species
    • †Murphitys michaeli – type locality for species
  • Musculus – or unidentified related form
  • †Myoconcha
    • †Myoconcha nana
  • Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella
    †Myophorella
    • †Myophorella argo
    • †Myophorella dawsoni – or unidentified related form
    • †Myophorella yellowstonensis
  • †Myophoria
    • †Myophoria brockensis – type locality for species
  • Myrtea
    • †Myrtea gabbi – tentative report
  • †Mytiloides
    • †Mytiloides labiatus
    • †Mytiloides mytiloides
    • †Mytiloides opalensis
    • †Mytiloides stantoni – or unidentified comparable form
  • Shells washed ashore of Mytilus mussels
    †Mytilus
    • †Mytilus pauperculus – or unidentified comparable form
    • †Mytilus quadratus
    • †Mytilus ursensis – type locality for species

N
  • †Nanonavis
    • †Nanonavis breweriana
  • Napora
    • †Napora bearensis – or unidentified comparable form
    • †Napora bukryi
    • †Napora collieri
    • †Napora dumitricai
    • †Napora durhami
    • †Napora elkcampensis
    • †Napora espinosa
    • †Napora latissima – or unidentified related form
    • †Napora lomoalta
    • †Napora nipponica
    • †Napora pacifica
    • †Napora praespinifera
    • †Napora pyramidalis
    • †Napora redonda
    • †Napora saginata – or unidentified related form
    • †Napora sixi
    • †Napora spinifera
  • Natica
    • †Natica allisoni
    • †Natica conradiana
  • †Navahopus
  • Life restoration of the Late Triassic thalattosaurs Nectosaurus (right) and Thalattosaurus
    †Nectosaurus
  • †Neithea
    • †Neithea grandicosta
  • †Nelltia
    • †Nelltia roddana – tentative report
    • †Nelltia salsa – type locality for species
  • †Nemodon
  • †Neocardioceras – tentative report
  • †Neohibolites
    • †Neohibolites fontinalis
  • †Neoparonaella
    • †Neoparonaella delicata
  • †Neophylloceras
    • †Neophylloceras hetonaiense
    • †Neophylloceras ramosum
    • †Neophylloceras vaculae
  • †Neopopanoceras
    • †Neopopanoceras haugi – type locality for species
  • †Neopuzosia
    • †Neopuzosia ishikawai
  • Fossilized shell of the Jurassic-Cretaceous sea snail Nerinea
    †Nerinea
    • †Nerinea stewarti – type locality for species
  • †Nerinella
    • †Nerinella santana – type locality for species
  • Nerita
    • †Nerita orovillensis – tentative report
  • Nodosarella
  • Nodosaria
    • †Nodosaria monile
    • †Nodosaria pomuligera
    • †Nodosaria spinifera
  • †Nolita
    • †Nolita ramosa
  • †Nonactaeonina
    • †Nonactaeonina obesa
    • †Nonactaeonina tensa – or unidentified comparable form
  • Restoration of several species of the Late Cretaceous ammonoid cephalopod Nostoceras
    †Nostoceras
    • †Nostoceras excelsus – type locality for species
    • †Nostoceras splendidum
  • †Notidanodon
    • †Notidanodon lanceolatus
  • †Notodonax
    • †Notodonax bolsae
  • †Novitripus
    • †Novitripus placitus
    • †Novitripus varius
  • †Novixitus
    • †Novixitus jurassicus
    • †Novixitus mclaughlini
  • †Nowakites
    • †Nowakites dobbinsi – type locality for species
    • †Nowakites klamathonis – type locality for species
    • †Nowakites puertoensis – type locality for species
    • †Nowakites rumseyensis – type locality for species
  • Nucinella
  • Nucleolites – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Nucleolites mercedensis
  • Interior of a fossilized shell of the Early Ordovician-modern marine bivalve Nucula
    Nucula
    • †Nucula gabbi
    • †Nucula storrsi
  • Nuculana
    • †Nuculana grandensis – or unidentified related form
    • †Nuculana translucida
  • †Nudivagus – tentative report
    • †Nudivagus califus – type locality for species

O
  • †Obesacapsula
    • †Obesacapsula cetia
    • †Obesacapsula morroensis
    • †Obesacapsula rotunda
  • †Obnixia – type locality for genus
    • †Obnixia thaynesiana
  • †Octopodichnus
  • †Olanda
    • †Olanda olorina
  • †Omphaloptycha
    • †Omphaloptycha obesa – type locality for species
    • †Omphaloptycha shastensis – type locality for species
  • Opalia
  • †Ophiceras
    • †Ophiceras involutum
  • †Opis
    • †Opis anae – type locality for species
    • †Opis californica – type locality for species
    • †Opis holzana
    • †Opis pacifica
    • †Opis popenoei – type locality for species
    • †Opis rosarioensis
    • †Opis triangulata – type locality for species
    • †Opis vancouverensis
  • †Orbiculiforma
    • †Orbiculiforma maxima
    • †Orbiculiforma multangula
    • †Orbiculiforma nevadaensis
    • †Orbiculiforma railensis
  • †Orbiculiformella
    • †Orbiculiformella teres
  • †Ornithella
    • †Ornithella curticensis – type locality for species
    • †Ornithella gemina – type locality for species
    • †Ornithella syringothyrides – type locality for species
  • †Orthoceras
    • †Orthoceras shastense – type locality for species
  • †Orthotrigonia
  • Ostrea
    • †Ostrea crescentica
  • Restoration of the Early Triassic ammonoid cephalopod Owenites
    †Owenites
    • †Owenites carpenteri
    • †Owenites koeneni – type locality for species
  • †Oxybeloceras
    • †Oxybeloceras petrolense
    • †Oxybeloceras taffi – type locality for species
  • †Oxyeurax
    • †Oxyeurax trapezoidalis
  • †Oxynautilus
    • †Oxynautilus acutus
  • †Oxytoma
  • †Oxytropidoceras
    • †Oxytropidoceras peruvianum

P
  • †Pachecocrinus
  • †Pachydesmoceras
    • †Pachydesmoceras colusaense
    • †Pachydesmoceras pachydiscoide – type locality for species
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Pachydiscus
    †Pachydiscus
    • †Pachydiscus ashlandicus – or unidentified related form
    • †Pachydiscus averilli – type locality for species
    • †Pachydiscus binodatus – or unidentified comparable form
    • †Pachydiscus buckhami
    • †Pachydiscus catarinae – or unidentified related form
    • †Pachydiscus coalingense
    • †Pachydiscus egertoni – or unidentified comparable form
    • †Pachydiscus henleyensis
    • †Pachydiscus japonicus – or unidentified comparable form
    • †Pachydiscus neevesi – or unidentified comparable form
    • †Pachydiscus ootacodensis
    • †Pachydiscus subcompressus
  • †Pachyoncus
    • †Pachyoncus kamiasoensis
  • †Paladmete – tentative report
  • †Palaeastraea – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Palaeastraea grandissima
  • †Palaeobates
    • †Palaeobates shastensis – type locality for species
  • †Palaeocypraea
    • †Palaeocypraea fontana – type locality for species
    • †Palaeocypraea wilfredi – type locality for species
  • †Palaeomoera
    • †Palaeomoera dyskritos
  • †Paleopsephaea
    • †Paleopsephaea sacramentica
  • †Paleotractus
    • †Paleotractus crassus
  • †Palinandromeda
    • †Palinandromeda fimbria
    • †Palinandromeda podbielensis
  • Panopea
    • †Panopea californica – or unidentified related form
  • †Pantanellium
    • †Pantanellium buntonense – or unidentified comparable form
    • †Pantanellium darlingtonense
    • †Pantanellium deflectum
    • †Pantanellium fishcreekensis
    • †Pantanellium foveatum
    • †Pantanellium josephinense
    • †Pantanellium meraceibaense
    • †Pantanellium rarum
    • †Pantanellium riedeli
    • †Pantanellium squinaboli
    • †Pantanellium ultrasincerum
  • †Paraganides – type locality for genus
    • †Paraganides californicus – type locality for species
  • †Parahauerites
    • †Parahauerites ashleyi – type locality for species
  • †Parahoplites
    • †Parahoplites sjogreni – or unidentified related form
  • †Parahsuum
    • †Parahsuum izeense
    • †Parahsuum mostleri
    • †Parahsuum ovale
    • †Parahsuum publicum
    • †Parahsuum simplum
    • †Parahsuum stanleyense
    • †Parahsuum transiens – or unidentified comparable form
  • †Parallelodon
    • †Parallelodon brewerianus
    • †Parallelodon vancouverensis
  • †Paranannites
    • †Paranannites oviformis – type locality for species
  • †Parapachydiscus
    • †Parapachydiscus bidwelli – type locality for species
    • †Parapachydiscus catarinae
    • †Parapachydiscus cortinaensis – type locality for species
    • †Parapachydiscus panochensis – type locality for species
    • †Parapachydiscus peninsularis – or unidentified related form
    • †Parapachydiscus stanislausensis – type locality for species
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Parapuzosia with a human indicating its size
    †Parapuzosia
    • †Parapuzosia arenaica – type locality for species
    • †Parapuzosia giganteum – type locality for species
    • †Parapuzosia hearni – type locality for species
    • †Parapuzosia hindsi – type locality for species
    • †Parapuzosia klamathonrae – type locality for species
    • †Parapuzosia waringi
  • †Paratropites
    • †Paratropites colei
    • †Paratropites shastensis
  • †Parisculites
    • †Parisculites obolinus
  • †Paronaella
    • †Paronaella aranae
    • †Paronaella bandyi
    • †Paronaella broennimanni – or unidentified related form
    • †Paronaella cleopatraensis
    • †Paronaella coalescenda
    • †Paronaella egregia
    • †Paronaella inornata
    • †Paronaella nipomoensis
    • †Paronaella obesa
    • †Paronaella panda
    • †Paronaella solanoensis – or unidentified comparable form
  • †Partschiceras
    • †Partschiceras grantzi – or unidentified comparable form
  • †Parussuria
    • †Parussuria compressa – type locality for species
  • Parvamussium
  • †Parvicingula
    • †Parvicingula alamoensis
    • †Parvicingula blowi
    • †Parvicingula bluefordae
    • †Parvicingula boesi
    • †Parvicingula broqueta
    • †Parvicingula citae
    • †Parvicingula colemani
    • †Parvicingula corona
    • †Parvicingula cuyamaensis
    • †Parvicingula deadhorsensis
    • †Parvicingula dhimenaensis – or unidentified related form
    • †Parvicingula excelsa
    • †Parvicingula gorda
    • †Parvicingula gracila
    • †Parvicingula jonesi
    • †Parvicingula khabakovi – or unidentified comparable form
    • †Parvicingula obstinata
    • †Parvicingula rothwelli
    • †Parvicingula sanfilippoae
    • †Parvicingula satura
    • †Parvicingula thomesensis
    • †Parvicingula turrita
    • †Parvicingula whalenae
    • †Parvicingula yehae
  • †Parvivacca
    • †Parvivacca coraforma
    • †Parvivacca immodica
    • †Parvivacca marina
    • †Parvivacca robusta
    • †Parvivacca simplex
    • †Parvivacca varica
  • †Paskentana
    • †Paskentana berryessaensis – type locality for species
    • †Paskentana globosa – type locality for species
    • †Paskentana paskentaensis
  • Patella – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Patella sheehani – type locality for species
    • †Patella stuarti – type locality for species
  • †Patulibracchium
    • †Patulibracchium grapevinensis
    • †Patulibracchium henlei – or unidentified related form
  • †Paxitropis
    • †Paxitropis dicriota
  • Shells of Pecten scallops
    †Pecten
    • †Pecten cowperi
    • †Pecten deformis – type locality for species
  • †Pedalion
  • †Pegaster – type locality for genus
    • †Pegaster stichos – type locality for species
  • †Pentacrinus
    • †Pentacrinus asteriscus – tentative report
  • †Pentzia
    • †Pentzia hilgardi
  • Periploma
    • †Periploma subgracile – or unidentified related form
  • †Periplomya – tentative report
  • †Perispyridium
    • †Perispyridium alinchakense – or unidentified related form
    • †Perispyridium bacatum
    • †Perispyridium dangerpointense
    • †Perispyridium gujohachimanense
    • †Perispyridium neotamanense
    • †Perispyridium ordinarium
  • †Perissitys
    • †Perissitys brevirostris
    • †Perissitys colocara – type locality for species
    • †Perissitys cretacea
    • †Perissitys elaphia – type locality for species
    • †Perissitys pacifica – type locality for species
    • †Perissitys stantoni
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Peroniceras
    †Peroniceras
    • †Peroniceras leei – or unidentified related form
    • †Peroniceras shastensis
  • †Pervinquieria
    • †Pervinquieria furberi – type locality for species
    • †Pervinquieria gainesana – type locality for species
  • †Petasiforma
    • †Petasiforma foremanae
    • †Petasiforma inusitata
  • Phanerolepida
    • †Phanerolepida onoensis – type locality for species
  • †Phantum
    • †Phantum insperatum – or unidentified comparable form
  • Pharella
    • †Pharella alta
  • †Phelopteria
  • †Phillippiella
  • Pholadomya
    • †Pholadomya diegoensis – or unidentified comparable form
    • †Pholadomya subelongata
  • Life restoration of the Early Jurassic-Late Cretaceous ammonoid cephalopod Phylloceras
    †Phylloceras
    • †Phylloceras gargantuum – type locality for species
    • †Phylloceras pachecoense – type locality for species
    • †Phylloceras velledae
  • †Phyllopachyceras
    • †Phyllopachyceras aldersona
  • †Piarorhynchia
    • †Piarorhynchia howardi – type locality for species
    • †Piarorhynchia winnemae – type locality for species
  • †Piestochilus – tentative report
  • †Pinacoceras
    • †Pinacoceras rex
  • †Pinna
    • †Pinna calamitoides
    • †Pinna expansa – or unidentified comparable form
  • †Pityostrobus
    • †Pityostrobus calforniensis – type locality for species
  • †Plesiotylosaurus
    • †Plesiotylosaurus crassidens
  • †Pleuromya
  • †Pleurotropites
    • †Pleurotropites gabbi – type locality for species
    • †Pleurotropites gracilis – type locality for species
  • Plicatula
    • †Plicatula perimbricata
    • †Plicatula variata
  • Mounted fossilized skeleton of the Late Cretaceous mosasaur Plotosaurus
    †Plotosaurus
    • †Plotosaurus bennisoni
    • †Plotosaurus tuckeri
  • †Podobursa
    • †Podobursa basilica
    • †Podobursa helvetica
    • †Podobursa lanza
    • †Podobursa rosea
    • †Podobursa spinellifera
    • †Podobursa spinosa
    • †Podobursa tamanensis
    • †Podobursa triacantha
  • †Podocapsa
    • †Podocapsa amphitreptera
  • Polinices
    • †Polinices mercedensis – type locality for species
    • †Polinices shumardianus – tentative report
  • †Polycyclus
    • †Polycyclus henseli
  • †Polyptychites
    • †Polyptychites trichotomus
  • Fossilized shell of the Late Cretaceous ammonoid cephalopod Polyptychoceras
    †Polyptychoceras
    • †Polyptychoceras obstrictum – or unidentified comparable form
  • †Posidonia
    • †Posidonia alpina
    • †Posidonia jacksoni – type locality for species
    • †Posidonia madisonensis – type locality for species
  • †Potamides – tentative report
    • †Potamides diadema
    • †Potamides grovesi – type locality for species
  • †Praeconocaryomma
    • †Praeconocaryomma decora – or unidentified comparable form
    • †Praeconocaryomma fasciata – tentative report
    • †Praeconocaryomma immodica
    • †Praeconocaryomma magnimamma – or unidentified comparable form
    • †Praeconocaryomma media – or unidentified comparable form
    • †Praeconocaryomma parvimamma – or unidentified comparable form
    • †Praeconocaryomma prisca
    • †Praeconocaryomma uhlensis
    • †Praeconocaryomma whiteavesi – or unidentified comparable form
  • †Praeconosphaera
    • †Praeconosphaera spinosa
  • †Praeparvicingula
    • †Praeparvicingula decora
    • †Praeparvicingula discors – or unidentified related form
    • †Praeparvicingula gemmata
    • †Praeparvicingula holdsworthi
    • †Praeparvicingula hurdygurdyensis
    • †Praeparvicingula nebulosa
    • †Praeparvicingula packsaddlensis
    • †Praeparvicingula rotunda
    • †Praeparvicingula saltata
    • †Praeparvicingula sencilla
    • †Praeparvicingula siskiyouensis
    • †Praeparvicingula turpicula
  • †Praewilliriedellum
    • †Praewilliriedellum cephalospinosum
  • †Preflorianites
    • †Preflorianites strongi – type locality for species
    • †Preflorianites toulai
  • †Prionocycloceras
    • †Prionocycloceras californicum
    • †Prionocycloceras crenulatum
  • †Prionolobus
    • †Prionolobus waageni – type locality for species
  • †Prionotropis
    • †Prionotropis casperi
    • †Prionotropis hiltensis – type locality for species
  • †Priscoficus – tentative report
  • †Prisconatica
    • †Prisconatica hesperia
  • †Proarcestes
    • †Proarcestes carpenteri – type locality for species
    • †Proarcestes pacificus
    • †Proarcestes shastensis – type locality for species
    • †Proarcestes traski – type locality for species
    • †Proarcestes whitneyi
    • †Proarcestes winnemae – type locality for species
  • †Proclydonautilus
    • †Proclydonautilus hessi – type locality for species
    • †Proclydonautilus spirolobus
    • †Proclydonautilus squawensis – type locality for species
    • †Proclydonautilus stantoni – type locality for species
    • †Proclydonautilus triadicus
    • †Proclydonautilus ursensis – type locality for species
  • Life restoration of the Late Cretaceous mosasaur Prognathodon
    †Prognathodon
    • †Prognathodon waiparaensis – or unidentified comparable form
  • †Projuvavites
    • †Projuvavites brockensis – type locality for species
    • †Projuvavites strongi – type locality for species
  • Propeamussium
  • †Prosphingitoides
    • †Prosphingitoides austini – type locality for species
  • †Protexanites
    • †Protexanites thompsoni
  • †Protocardia
    • †Protocardia remondianum
    • †Protocardia translucidum
  • †Protovallupus
    • †Protovallupus tetlamaensis
  • Fossilized shell of the Triassic ammonoid cephalopod Protrachyceras
    †Protrachyceras
    • †Protrachyceras storrsi – type locality for species
  • †Protunuma
    • †Protunuma japonicus
    • †Protunuma multicostatus – or unidentified related form
  • †Pseudacrochordiceras
    • †Pseudacrochordiceras inyoense – type locality for species
  • †Pseudanchura
    • †Pseudanchura biangulata
  • †Pseudhelicoceras
    • †Pseudhelicoceras petersoni – type locality for species
  • †Pseudocrucella
    • †Pseudocrucella ehrenbergi
  • †Pseudocymia – type locality for genus
    • †Pseudocymia aitha – type locality for species
    • †Pseudocymia aurora – type locality for species
    • †Pseudocymia cahalli – type locality for species
  • †Pseudodiadema
    • †Pseudodiadema emersoni
  • †Pseudodictyomitra
    • †Pseudodictyomitra lodogaensis
    • †Pseudodictyomitra pentacolaensis
    • †Pseudodictyomitra pseudomacrocephala
    • †Pseudodictyomitra vestalensis
  • †Pseudoeucyrtis
    • †Pseudoeucyrtis firmus
    • †Pseudoeucyrtis hannai – or unidentified comparable form
    • †Pseudoeucyrtis paskentaensis
  • †Pseudogaleodea
  • †Pseudoheliodiscus
  • Fossilized shell of a Pseudomelania sea snail
    †Pseudomelania
    • †Pseudomelania colusaensis – type locality for species
  • †Pseudoperna
    • †Pseudoperna toxidonta
  • †Pseudophyllites
  • †Pseudoptera – tentative report
  • †Pseudoristola
    • †Pseudoristola clava
    • †Pseudoristola nova
  • †Pseudosageceras
    • †Pseudosageceras multilobatum
  • †Pseudothurmannia – tentative report
    • †Pseudothurmannia jupiter
    • †Pseudothurmannia russelli
  • †Pseudoxybeloceras
    • †Pseudoxybeloceras lineatum – or unidentified comparable form
  • †Pteraichnus
  • †Pteroluter
    • †Pteroluter othnius – type locality for species
  • Fossilized shell of the Jurassic-Cretaceous marine bivalve Pterotrigonia
    †Pterotrigonia
    • †Pterotrigonia evansana
    • †Pterotrigonia klamathonia
    • †Pterotrigonia oregana – or unidentified comparable form
  • †Ptilorhynchia – type locality for genus
    • †Ptilorhynchia plumasensis – type locality for species
  • †Ptiloteuthis – type locality for genus
    • †Ptiloteuthis foliatus – type locality for species
  • †Ptychoceras – type locality for genus
    • †Ptychoceras laeve – type locality for species
  • †Ptyctothyris
    • †Ptyctothyris hardgravensis – type locality for species
    • †Ptyctothyris phlegethontis – type locality for species
  • †Pugnellus
    • †Pugnellus hammulus – or unidentified related form
    • †Pugnellus hamulus
    • †Pugnellus manubriatus
  • †Puzosia
    • †Puzosia hannai – type locality for species
    • †Puzosia puma
    • †Puzosia sullivanae
  • Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
    Pycnodonte
  • †Pyktes
    • †Pyktes hamulus
  • †Pyramispongia
    • †Pyramispongia glascockensis
  • †Pyropsis

Q
  • Quadrans – tentative report
  • †Quinquecapsularia
    • †Quinquecapsularia spinosa

R
  • †Radioceras
    • †Radioceras evolvens
  • †Remondia
    • †Remondia oregonensis – type locality for species
  • †Reptolunulites
  • Retusa
  • †Rhabdoceras
    • †Rhabdoceras suessi
  • †Rhactorhynchia
    • †Rhactorhynchia trigona – type locality for species
  • †Rhaetina – tentative report
    • †Rhaetina pyriformis
  • †Rhectomax
    • †Rhectomax undulatus
  • †Rhectomyax
    • †Rhectomyax undulatus
  • Fossilized shell of the Silurian-Eocene articulate brachiopod Rhynchonella
    †Rhynchonella
    • †Rhynchonella richardsoni – type locality for species
    • †Rhynchonella varians – or unidentified comparable form
  • †Riedelius
  • †Ristola
    • †Ristola altissima
    • †Ristola bala
    • †Ristola procera
    • †Ristola turpicula
  • Robulus
    • †Robulus inornatus
  • Rogerella
  • †Romaniceras
    • †Romaniceras deverioide

S
  • †Sagenites
    • †Sagenites dickersoni – type locality for species
  • †Saghalinites
  • †Sandlingites
    • †Sandlingites andersoni – type locality for species
    • †Sandlingites oribasus
  • †Sarasinella
    • †Sarasinella angulata
  • †Saturniforma
    • †Saturniforma peregrina
  • †Scalarites
  • Restoration of several of the Early Cretaceous-Miocene shark Scapanorhynchus
    †Scapanorhynchus
  • Scaphander
    • †Scaphander costatus
  • †Scaphites
    • †Scaphites hippocrepis – or unidentified related form
    • †Scaphites inermis – or unidentified related form
    • †Scaphites pittensis – type locality for species
  • †Scaphotrigonia
    • †Scaphotrigonia naviformis
  • †Sciponoceras
    • †Sciponoceras gracile – type locality for species
  • Scobinella
    • †Scobinella dilleri
  • †Semihsuum
    • †Semihsuum biscuithillense
    • †Semihsuum brokencotense
    • †Semihsuum inexploratum
    • †Semihsuum sourdoughense
  • †Senis
  • Septifer
  • †Sequoia
    • †Sequoia reichenbachi
  • Serpula
  • Life restoration of three species of the Middle-Late Triassic ichthyosaur genus Shastasaurus
    †Shastasaurus
    • †Shastasaurus alexandrae
    • †Shastasaurus pacificus
  • †Shasticrioceras
    • †Shasticrioceras whitneyi – or unidentified related form
  • †Shastites
    • †Shastites compactus – type locality for species
    • †Shastites compressus – type locality for species
    • †Shastites whitneyi – type locality for species
  • †Shastoceras
  • †Silberlingia
    • †Silberlingia sanctaeanae
  • †Simbirskites
    • †Simbirskites broadi
    • †Simbirskites lecontei
  • Siphonalia
    • †Siphonalia dubius
  • †Sirenites
    • †Sirenites lawsoni – type locality for species
  • †Skolithos
  • Solariella
    • †Solariella occidentalis
    • †Solariella stewarti
  • Solemya – tentative report
  • Solen
    • †Solen cuneatus – or unidentified comparable form
  • †Solenoceras
  • †Spiriferina – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Spiriferina coreyi – type locality for species
  • †Spirigera – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Spirigera milesi – type locality for species
  • †Spirogmoceras
    • †Spirogmoceras shastense – type locality for species
  • †Spondylospira
    • †Spondylospira lewesensis
    • †Spondylospira parmata
  • Spondylus
    • †Spondylus subnodosus
  • †Spongiomorpha
    • †Spongiomorpha tenuis
  • †Spongocapsula
    • †Spongocapsula dumitricai
    • †Spongocapsula hooveri
    • †Spongocapsula palmerae
    • †Spongocapsula zamoraensis
  • †Spongosaturninus
    • †Spongosaturninus bispinus
  • Life restoration of the Late Cretaceous shark Squalicorax
    Squalicorax
  • †Staurolonche
  • Stichocapsa
    • †Stichocapsa convexa
    • †Stichocapsa japonica
  • Stichomitra – tentative report
    • †Stichomitra takanoensis
  • †Stoliczkaia
    • †Stoliczkaia praecursor – type locality for species
  • †Stomechinus
    • †Stomechinus hyatti
  • †Striatojaponocapsa
    • †Striatojaponocapsa conexa
    • †Striatojaponocapsa plicarum
  • †Stromatomorpha
    • †Stromatomorpha californica – type locality for species
  • †Sturia
    • †Sturia woodini
  • †Subhungarites
    • †Subhungarites yatesi – type locality for species
  • †Submeekoceras
    • †Submeekoceras mushbachanum
  • †Submortoniceras
    • †Submortoniceras buttense
    • †Submortoniceras buttensis – type locality for species
    • †Submortoniceras chicoense
    • †Submortoniceras gabbi
    • †Submortoniceras pentzanum – type locality for species
    • †Submortoniceras randalli
    • †Submortoniceras studleyi
  • †Subprinocyclus
  • †Subprionocyclus
    • †Subprionocyclus branneri
    • †Subprionocyclus neptuni – or unidentified comparable form
    • †Subprionocyclus normalis – or unidentified comparable form
    • †Subprionocyclus oregonense
  • † Suna
    • †Suna ehrenbergi
    • †Suna haeckeli
    • †Suna harperi
  • †Sympolycyclus
    • †Sympolycyclus kellyi – type locality for species
    • †Sympolycyclus nodifer – type locality for species
  • †Syncyclonema
    • †Syncyclonema latum – type locality for species
    • †Syncyclonema operculiformis

T
  • †Tappanella
    • †Tappanella novacubica
  • †Tardeceras – type locality for genus
    • †Tardeceras parvum – type locality for species
  • †Tegula
    • †Tegula jeanae
  • †Tehamatea
    • †Tehamatea ovalis
  • †Teichertus
    • †Teichertus cavernosus
    • †Teichertus notus
  • Shell of a Tellina, or tellin
    Tellina
    • †Tellina – type locality for species A – informal
    • †Tellina alisoensis
    • †Tellina ashburnerii
    • †Tellina ooides
    • †Tellina paralis
    • †Tellina quadrata
    • †Tellina whitneyi
  • †Tenea
    • †Tenea inflata
  • †Teneposita – type locality for genus
    • †Teneposita laeva – type locality for species
  • A living Terebralia horn sea snail
    Terebralia – tentative report
    • †Terebralia juliana
  • Terebratella
    • †Terebratella densleonis
  • Terebratulina
    • †Terebratulina indomita – type locality for species
  • †Tessarolax
    • †Tessarolax distorta
    • †Tessarolax trinalis
  • †Tethysetta
    • †Tethysetta boesii
  • †Tetracapsa
    • †Tetracapsa horokanaiensis
  • †Tetraditryma
    • †Tetraditryma coldspringensis
    • †Tetraditryma corralitosensis
    • †Tetraditryma oregonensis
    • †Tetraditryma praeplena
    • †Tetraditryma pseudoplena
  • †Tetragonites
    • †Tetragonites cala
    • †Tetragonites epigonum
    • †Tetragonites glabrus – or unidentified comparable form
    • †Tetragonites popetensis – type locality for species
  • †Tetrahoplitoides
    • †Tetrahoplitoides stantoni
  • 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
  • †Thanarla
    • †Thanarla brouweri
    • †Thanarla elegantissima
    • †Thanarla praeveneta
    • †Thanarla veneta
  • †Thetironia
    • †Thetironia annulata
  • †Thisbites
    • †Thisbites uhligi
  • †Thurmanniceras
    • †Thurmanniceras californicum
    • †Thurmanniceras jenkinsi
    • †Thurmanniceras stippi
  • Thyasira
    • †Thyasira cretacea
  • †Tibetothyris – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Tibetothyris julica
  • †Tibiaporrhais – tentative report
  • †Tollia
    • †Tollia giganteus
  • †Tornatellaea
    • †Tornatellaea impressa
  • †Tornquistites – type locality for genus
    • †Tornquistites evolutus – type locality for species
  • †Trachybaculites
    • †Trachybaculites columna
  • †Trachysagenites
    • †Trachysagenites erinaceus
    • †Trachysagenites herbichi
    • †Trachysagenites shastensis – type locality for species
  • †Trachystenoceras
    • †Trachystenoceras gabbi – type locality for species
  • †Tragodesmoceras
    • †Tragodesmoceras ashlandicum
  • †Trajanella
    • †Trajanella californica
  • †Transhsuum
    • †Transhsuum brevicostatum
  • †Traskites
    • †Traskites americanus – type locality for species
    • †Traskites californicus – type locality for species
    • †Traskites evolutus – type locality for species
    • †Traskites fairbanksi – type locality for species
    • †Traskites minutus – type locality for species
    • †Traskites nanus – type locality for species
    • †Traskites osmonti – type locality for species
    • †Traskites robustus – type locality for species
    • †Traskites rugosus – type locality for species
    • †Traskites stantoni – type locality for species
    • †Traskites tornquisti – type locality for species
  • †Triactoma
    • †Triactoma blakei
    • †Triactoma jonesi
    • †Triactoma kellumi
    • †Triactoma longoriai
  • †Trichinopolia
    • †Trichinopolia californica – type locality for species
  • Tricolocapsa
  • †Trigonarca
    • †Trigonarca californica – or unidentified related form
    • †Trigonarca californicus
    • †Trigonarca excavata
  • Fossilized shell of the Permian-Paleocene marine bivalve Trigonia
    †Trigonia
    • †Trigonia aequicostata
    • †Trigonia denticulata – or unidentified comparable form
    • †Trigonia evansana
    • †Trigonia fitchi
    • †Trigonia hemisphaerica – or unidentified related form
    • †Trigonia hemphilli
    • †Trigonia inezana – or unidentified related form
    • †Trigonia jacksonensis – type locality for species
    • †Trigonia leana
    • †Trigonia perrinsmithi – type locality for species
    • †Trigonia plumasensis – type locality for species. Later reclassified in the new genus Californigonia as C. plumasensis.[1]
    • †Trigonia spinulosa – or unidentified comparable form
    • †Trigonia tryoniana
    • †Trigonia undulata
    • †Trigonia vcostata – or unidentified comparable form
  • †Trigonocallista
    • †Trigonocallista bowersiana
    • †Trigonocallista nitida
    • †Trigonocallista varians
  • †Trillus
    • †Trillus elkhornensis
    • †Trillus seiderense – or unidentified comparable form
  • †Trinacria
    • †Trinacria cor
  • †Tripocyclia
    • †Tripocyclia brooksi
    • †Tripocyclia foremanae
    • †Tripocyclia frenchflatensis
    • †Tripocyclia highdomensis
    • †Tripocyclia mascula
    • †Tripocyclia saleebyi
  • †Tritrabs
    • †Tritrabs casmaliaensis
    • †Tritrabs ewingi
    • †Tritrabs exotica
    • †Tritrabs hayi
    • †Tritrabs rhododactylus
    • †Tritrabs suavia
    • †Tritrabs worzeli
  • †Triversus
    • †Triversus fastigatus
  • Fossilized shell in multiple views of the Early-Late Cretaceous sea snail Trochactaeon
    †Trochactaeon
    • †Trochactaeon frazierensis
    • †Trochactaeon packardi
  • Trochocyathus
    • †Trochocyathus pergranulatus – type locality for species
  • Trophon
    • †Trophon condoni
  • †Tropiceltites
    • †Tropiceltites caducus
  • †Tropites
    • †Tropites arthaberi
    • †Tropites brockensis – type locality for species
    • †Tropites dieneri – type locality for species
    • †Tropites dilleri – type locality for species
    • †Tropites fusobullatus
    • †Tropites hessi – type locality for species
    • †Tropites keili
    • †Tropites kellyi – type locality for species
    • †Tropites mojsvarensis – type locality for species
    • †Tropites morani – type locality for species
    • †Tropites reticulatus
    • †Tropites rotatorius – type locality for species
    • †Tropites rothpletzi – type locality for species
    • †Tropites schellwieni – type locality for species
    • †Tropites shastensis – type locality for species
    • †Tropites stearnsi – type locality for species
    • †Tropites ursensis – type locality for species
    • †Tropites welleri – type locality for species
    • †Tropites wodani
  • †Turanta
    • †Turanta chetcoensis
    • †Turanta flexa
    • †Turanta luminosa
    • †Turanta okamurai – or unidentified comparable form
  • †Turrilites
    • †Turrilites acutus
    • †Turrilites costatus – or unidentified comparable form
    • †Turrilites petersoni – type locality for species
  • Fossilized shells of the Late Jurassic-modern tower snail Turritella
    Turritella
    • †Turritella chaneyi
    • †Turritella chicoensis
    • †Turritella hearni
    • †Turritella infralineata
    • †Turritella peninsularis – or unidentified related form
    • †Turritella pescaderoensis
    • †Turritella peterseni – or unidentified related form
    • †Turritella petersoni
    • †Turritella robertiana – or unidentified comparable form
    • †Turritella webbi
    • †Turritella xylina
  • †Tylostoma
    • †Tylostoma garzana – type locality for species

U
  • †Unuma
    • †Unuma echinatus
    • †Unuma gordus
    • †Unuma typicus

V
  • †Vallupus
    • †Vallupus hopsoni
  • †Vaugonia
    • †Vaugonia kobayashii – or unidentified comparable form
    • †Vaugonia obliqua
    • †Vaugonia yukonensis – tentative report
  • †Vitorfus
    • †Vitorfus campbelli
  • Volsella
    • †Volsella siskiyouensis
  • †Volutoderma
    • †Volutoderma averilli
    • †Volutoderma averillii
    • †Volutoderma californica
    • †Volutoderma dilleri
    • †Volutoderma gabbi
    • †Volutoderma jacksonensis
    • †Volutoderma magna
    • †Volutoderma santana

W
  • †Wilbertopora
    • †Wilbertopora sannerae – type locality for species
  • †Willimactra
    • †Willimactra mathewsonii
    • †Willimactra popenoei
    • †Willimactra putida
    • †Willimactra truncata
  • †Williriedellum
    • †Williriedellum carpathicum
    • †Williriedellum frequens
    • †Williriedellum madstonense
  • †Wilvemia
    • †Wilvemia whiskeyensis
  • †Worthenia
    • †Worthenia klamathensis – type locality for species
  • †Wrangellium
  • †Wyomingites
    • †Wyomingites aplanatus

X
  • †Xiphostylus
    • †Xiphostylus gasquetensis
    • †Xiphostylus humboldtensis
  • †Xitus
    • †Xitus antelopensis
    • †Xitus antiquus
    • †Xitus plenus
    • †Xitus pulcher
    • †Xitus singularis
    • †Xitus spicularius
    • †Xitus spineus

Y
  • †Yaadia
    • †Yaadia branii – or unidentified comparable form
    • †Yaadia hemphilli
    • †Yaadia robusta
    • †Yaadia tryoniana
  • †Yezoites
    • †Yezoites puerculus – or unidentified comparable form
  • Yoldia
    • †Yoldia diminutiva
    • †Yoldia leana
    • †Yoldia nasuta

Z
  • †Zanola
    • †Zanola cornuta – or unidentified comparable form
  • †Zartus
  • †Zealandites
  • †Zhamoidellum
    • †Zhamoidellum exquisita
    • †Zhamoidellum kiesslingi
    • †Zhamoidellum kozuri
    • †Zhamoidellum parva
    • †Zhamoidellum triangulosa
  • †Zifondium
    • †Zifondium lassenensis
    • †Zifondium paupera
  • †Zimmerella – type locality for genus
    • †Zimmerella eastoni
  • †Zinsitys – tentative report
  • †Zugmayerella
    • †Zugmayerella americana
  • †Zugmeyeria


gollark: ruST.
gollark: RuST.
gollark: Rust.
gollark: RUst.
gollark: min ekraft.

References
  1. Michael R. Cooper; Héctor A. Leanza (2019). "On the Middle Jurassic – Early Cretaceous Megatrigoniinae (Bivalvia, Trigoniida): their biogeography, evolution and classification". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 291 (1): 19–40. doi:10.1127/njgpa/2019/0787.
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