# 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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* 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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
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* L
* M
* N
* O
* P
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* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
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* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

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* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* 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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* 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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* 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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* 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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Quadrans – tentative report
* †Quinquecapsularia
** †Quinquecapsularia spinosa

## R

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Unuma
** †Unuma echinatus
** †Unuma gordus
** †Unuma typicus

## V

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Xiphostylus
** †Xiphostylus gasquetensis
** †Xiphostylus humboldtensis
* †Xitus
** †Xitus antelopensis
** †Xitus antiquus
** †Xitus plenus
** †Xitus pulcher
** †Xitus singularis
** †Xitus spicularius
** †Xitus spineus

## Y

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †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

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* 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