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
  • †Californigonia plumasensis – type locality for species. Formerly classified as Trigonia plumasensis.
• †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
• †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.
  • †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

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.