# List of the Paleozoic life of California

This list of the Paleozoic 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 538.8 and 252.17 million years of age.

## A

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* †Acanthopecten
* †Acidiphorus
** †Acidiphorus hesperia
* †Advenella
** †Advenella bifurcata
* †Agathiceras
* †Alaskospira
** †Alaskospira dunbari – or unidentified comparable form
* †Albertella
** †Albertella longwelli
* †Alitaria – tentative report
* †Allosaccus – tentative report
* †Alokistocare
* †Alokistocarella
** †Alokistocarella brighamensis – or unidentified comparable form
* †Amblysiphonella
** †Amblysiphonella grossa
* †Amblysiphonelloides
** †Amblysiphonelloides reticulata
** †Amblysiphonelloides tubulara
* †Ambocoelia – tentative report
* †Amecephalus
** †Amecephalus arrojosensis
* †Ampyx – tentative report
* †Ampyx
** †Ampyx compactus
* †Anidanthus
** †Anidanthus shastensis – type locality for species
* †Annuliconcha
* †Anomalorthis
* †Anoptambonites
** †Anoptambonites myiomorpheus – type locality for species
** †Anoptambonites myriomorpheus
* †Antiquatonia
* †Apatolichas
* †Arceodomus
** †Arceodomus langenheimi – type locality for species
* †Archaeoscyphia
** †Archaeoscyphia mazourkaensis – type locality for species
* †Arcullina
** †Arcullina polaris – or unidentified related form
* †Arcuolenellus
** †Arcuolenellus megafrontalis – or unidentified comparable form
* Fossil of the mysterious Ediacaran organism Aspidella †Aspidella – tentative report
** †Aspidella terranovica
* †Astartella
* †Atrypa
** †Atrypa reticularis
* †Atrypella
** †Atrypella tenuis – or unidentified comparable form
* †Atrypoidea – tentative report
* †Aulophyllum – tentative report
* †Austinella
** †Austinella kankakensis – or unidentified related form
** †Austinella kankakesis – or unidentified related form
* Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten †Aviculopecten
** †Aviculopecten dissimilis
** †Aviculopecten fimbriatus
** †Aviculopecten occidentalis – or unidentified comparable form

## B

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* †Bakevellia
* †Bathymyonia
** †Bathymyonia nevadensis – or unidentified comparable form
* †Bayhaium
** †Bayhaium merriamorum
** †Bayhaium virginiae – type locality for species
* †Bellefontia
* †Beraunia
** †Beraunia bifrons – or unidentified comparable form
* †Bicarina
** †Bicarina petilitornata
* †Biformispira – type locality for genus
** †Biformispira isaacsoni – type locality for species
* †Bighornia
* †Bimuria
* †Blastoidocrinus
** †Blastoidocrinus carchariaedens – or unidentified comparable form
* †Bolbolenellus
** †Bolbolenellus brevispinus
** †Bolbolenellus euryparia
* †Bonnia
* †Boucotspira – type locality for genus
** †Boucotspira fimbriata – type locality for species
* †Brachyprion
** †Brachyprion seretensis – or unidentified comparable form
* Fossil of the Cambrian trilobite Bristolia †Bristolia
** †Bristolia anteros
** †Bristolia brachyomma
** †Bristolia bristolensis
** †Bristolia fragilis
** †Bristolia insolens
** †Bristolia mohavensis
* †Bryorhynchus – report made of unidentified related form or using admittedly obsolete nomenclature
** †Bryorhynchus bisulcatum
* †Bumastus
* †Buxtonia
** †Buxtonia scabriculoides
** †Buxtonia websteri – or unidentified comparable form

## C

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* †Calycocoelia
** †Calycocoelia typicalis – type locality for species
* Fossil of the Early Ordovician-Early Devonian trilobite Calymene †Calymene
* †Camarotoechia – tentative report
* †Cancrinella
** †Cancrinella phosphatica
** †Cancrinella undata
* †Carolinites
** †Carolinites genacinaca
** †Carolinites sibiricus
* †Chalaroschwagerina
** †Chalaroschwagerina inflata – type locality for species
** †Chalaroschwagerina obesa – type locality for species
** †Chalaroschwagerina pulchra – type locality for species
** †Chalaroschwagerina tumentis – type locality for species
* †Cheilocephalus
* †Chonetes
* †Chonetinella
* †Choristitella
* †Cladopora
* †Clavicosta – tentative report
* †Cleiothyridina
* †Clelandia
** †Clelandia aspina
** †Clelandia bispina
* †Cliefdenella
** †Cliefdenella alaskaensis
* †Clisiophyllum
** †Clisiophyllum gabbi
** †Clisiophyllum oweni – type locality for species
* Fossilized shell of the Late Devonian-Permian brachiopod Composita †Composita
** †Composita grandis – or unidentified comparable form
** †Composita subtilita – or unidentified comparable form
* †Conchidium
** †Conchidium biloculare – or unidentified comparable form
* †Conocardium
* †Cordillerastraea
** †Cordillerastraea inyoensis – type locality for species
* †Cornwallatia
** †Cornwallatia tabularia
* †Corymbospongia
** †Corymbospongia adnata
** †Corymbospongia mica
** †Corymbospongia perforata
* †Costispinifera – report made of unidentified related form or using admittedly obsolete nomenclature
** †Costispinifera costata – tentative report
* †Crenulosepta
** †Crenulosepta delicata – type locality for species
** †Crenulosepta fusiformis – type locality for species
** †Crenulosepta inyoensis – type locality for species
** †Crenulosepta rossi – type locality for species
** †Crenulosepta wahlmani – type locality for species
* †Crurithyris
* Fossil of the Devonian-Triassic arthropod trackway ichnogenus Cruziana †Cruziana
* †Cuniculinella
** †Cuniculinella acuta – type locality for species
** †Cuniculinella ampla – type locality for species
** †Cuniculinella calx
** †Cuniculinella extensa – type locality for species
** †Cuniculinella fusiformis – type locality for species
** †Cuniculinella mojavensis – type locality for species
** †Cuniculinella munda – type locality for species
** †Cuniculinella parva – type locality for species
** †Cuniculinella solita – type locality for species
** †Cuniculinella tumida – type locality for species
** †Cuniculinella ventricosa – type locality for species
* †Cyathactis
** †Cyathactis gazellensis – type locality for species
* †Cybelurus
* Fossilized shell of the Permian ammonoid cephalopod Cyclolobus †Cyclolobus
** †Cyclolobus walkeri
* †Cyclonema
** †Cyclonema bilix – or unidentified comparable form
* †Cymbidium
* †Cyrtina
* †Cystiphyllum
* †Cystothalamiella
** †Cystothalamiella craticula
** †Cystothalamiella ducta
** †Cystothalamiella tuboides

## D

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* Fossil of the Cambrian trilobite Daguinaspis †Daguinaspis
* †Dalejina
* †Dalmanella
* †Dalmanophyllum
** †Dalmanophyllum dalmani – or unidentified comparable form
* †Darwasophyllum – tentative report
* †Deacheospira
** †Deacheospira hotzi – type locality for species
* †Deltopecten – tentative report
* †Derbyia
* †Diacanthaspis
* †Dicellograptus
* †Dicoelosia
** †Dicoelosia conspicua – or unidentified related form
** †Dicoelosia jonesridgenesis
** †Dicoelosia jonesridgensis
* †Dictyoclostus – report made of unidentified related form or using admittedly obsolete nomenclature
* Fossil of the Middle Ordovician graptolite Didymograptus †Didymograptus
** †Didymograptus protobifidus
* †Dimeropygiella
** †Dimeropygiella caudanodosa
* †Diochthofera
** †Diochthofera conspicua
* †Diplanus
** †Diplanus stanleyi
* †Diplichnites
* †Discomyorthis
* †Discotropis – tentative report
* †Dolerorthis
* †Donaldiella
** †Donaldiella derwiduii – or unidentified comparable form
* †Dorsoscyphus
** †Dorsoscyphus johnsoni
* †Durhamina
** †Durhamina kenneyi – type locality for species
* †Dyticospirifer

## E

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* B
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* D
* E
* F
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* H
* I
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* M
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* †Eccyliopterus
** †Eccyliopterus regularis – or unidentified related form
* †Echinauris
** †Echinauris subhorrida
* †Echinoconchus
** †Echinoconchus punctatus
* †Ectenonotus
** †Ectenonotus raymondi – or unidentified comparable form
** †Ectenonotus westoni – or unidentified comparable form
** †Ectenonotus whittingtoni
* †Ectomaria
** †Ectomaria callahanensis – type locality for species
** †Ectomaria prisca
* †Elasmothyris
** †Elasmothyris limata – type locality for species
* †Encrinurus
* Fossilized shells and restored appearances of the Middle-Late Ordovician nautiloid cephalopod Endoceras †Endoceras – tentative report
* †Enigmalites
** †Enigmalites roberti – type locality for species
* †Eofletcheria
* †Eomarginifera
* †Eoparafusulina
** †Eoparafusulina alta – type locality for species
** †Eoparafusulina brevis – type locality for species
** †Eoparafusulina certa – type locality for species
** †Eoparafusulina contracta – type locality for species
** †Eoparafusulina cylindrica – type locality for species
** †Eoparafusulina depressa – type locality for species
** †Eoparafusulina gracilis
** †Eoparafusulina linearis
** †Eoparafusulina minuta – type locality for species
** †Eoparafusulina modica – type locality for species
** †Eoparafusulina nitida – type locality for species
** †Eoparafusulina ovata – type locality for species
** †Eoparafusulina parva – type locality for species
** †Eoparafusulina potterensis – type locality for species
** †Eoparafusulina proba – type locality for species
** †Eoparafusulina regularis – type locality for species
** †Eoparafusulina rotunda – type locality for species
** †Eoparafusulina spissa – type locality for species
** †Eoparafusulina tarda – type locality for species
** †Eoparafusulina tenuitheca – type locality for species
** †Eoparafusulina thompsoni
* †Eotomaria
** †Eotomaria perryi – type locality for species
* †Epitomyonia
** †Epitomyonia recilina
** †Epitomyonia relicina
* †Eridmatus
** †Eridmatus texanus – or unidentified comparable form
* †Eridorthis
* †Eripnifera – type locality for genus
** †Eripnifera praecipitis – type locality for species
* †Etheripecten
* †Euconospira
* †Eunema
** †Eunema strigillatum – or unidentified comparable form
* †Euomphalopterus – tentative report
* Fossilized shell of the Silurian-Permian sea snail Euomphalus †Euomphalus
* †Eurogrewingkia
** †Eurogrewingkia penobscotensis
* †Eusphairica – type locality for genus
** †Eusphairica distubula – type locality for species

## F

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* Illustration of a fossil of the Cambrian trilobite Fallotaspis †Fallotaspis
* †Favosites
* †Fenestella
* †Fieldaspis
* †Fluctuaria
* †Fomichevella
** †Fomichevella major – or unidentified comparable form
** †Fomichevella nevadensis

## G

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* †Gallatinospongia
** †Gallatinospongia conica
* †Girtyocoelia
** †Girtyocoelia epiporata
** †Girtyocoelia tubula
* †Glassia – tentative report
* †Globonema
** †Globonema niota – or unidentified comparable form
* †Glossopleura
** †Glossopleura lodensis
** †Glossopleura walcotti
* †Glyptorthis
* Life restoration of the Cambrian echinoderm Gogia †Gogia
** †Gogia ojenai – type locality for species
* †Goniostropha
** †Goniostropha bachelieri – or unidentified comparable form
* †Gshelia
** †Gshelia americana – type locality for species
* †Gypidula

## H

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* †Halysites
* †Heintzella
** †Heintzella applegatei – type locality for species
** †Heintzella playfordi
* †Helicoplacus
** †Helicoplacus gilberti
* Life restoration of the Permian Chimaera relative Helicoprion †Helicoprion
** †Helicoprion davisii
* †Helicotoma
** †Helicotoma griffinorum – type locality for species
* †Heliolites
* †Heliomeroides
* †Hercynella
** †Hercynella bohemica – or unidentified comparable form
* †Heritschiella
** †Heritschiella girtyi
* †Heritschioides
** †Heritschioides carneyi – type locality for species
** †Heritschioides hammani – type locality for species
** †Heritschioides wexoi – type locality for species
* †Hesperocoelia
** †Hesperocoelia undulata
* †Hesperorthis
** †Hesperorthis dubia – or unidentified comparable form
** †Hesperorthis evenkiensis
* †Heterocaninia
** †Heterocaninia langenheimi – type locality for species
* Fossilized shells of the Ordovician-Carboniferous sea snail Holopea †Holopea
** †Holopea brucei – type locality for species
** †Holopea elizabethi – type locality for species
** †Holopea glindmeyeri – type locality for species
** †Holopea symmetrica – or unidentified comparable form
* †Hormotoma
* †Howellella
** †Howellella smithi – or unidentified comparable form
* †Hustedia
** †Hustedia compressa
* †Hyalostelia
* †Hyolithes
* †Hystricurus

## I

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* Fossil of the Middle Ordovician trilobite Illaenus †Illaenus
* †Imperatoria
** †Imperatoria irregularis
** †Imperatoria media
** †Imperatoria mega
** †Imperatoria minima
* †Ingria
* †Inyoschwagerina
** †Inyoschwagerina elayeri – type locality for species
** †Inyoschwagerina elongata – type locality for species
** †Inyoschwagerina inflata – type locality for species
** †Inyoschwagerina linderae – type locality for species
** †Inyoschwagerina magnifica – type locality for species
** †Inyoschwagerina mira – type locality for species
** †Inyoschwagerina rotunda – type locality for species
** †Inyoschwagerina turgida
* †Ischyrotoma
* †Iskutella
** †Iskutella fergusoni – type locality for species
* †Isogramma
** †Isogramma pachti
* †Isorthis – tentative report
* Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus
** †Isotelus spurius

## K

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* †Kabyaipecten
* †Karavankina
* †Kawina
** †Kawina scrobiculus
* †Kirkirhynchus
** †Kirkirhynchus reesidei – or unidentified comparable form
* †Kitakamithyris
* †Klamathastraea – type locality for genus
** †Klamathastraea dilleri – type locality for species
* †Klamathina
** †Klamathina elongata – type locality for species
** †Klamathina simplex – type locality for species
** †Klamathina singularis – type locality for species
* †Kleopatrina – type locality for genus
** †Kleopatrina mccloudensis – type locality for species
** †Kleopatrina raubae – type locality for species
* †Komiella
** †Komiella ostiolata – or unidentified comparable form
* †Krotovia
* Illustration of a fossilized shell of the brachiopod Kutorgina †Kutorgina
* †Kyphophyllum
** †Kyphophyllum greggi – type locality for species

## L

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* †Langenheimia – type locality for genus
** †Langenheimia klamathensis – type locality for species
* †Laticrura
** †Laticrura erecta – or unidentified related form
* †Leioclema – tentative report
* †Leperditia
** †Leperditia bivia
* †Leptellina
* †Leptodus
** †Leptodus nobilis – or unidentified related form
* †Leptostrophia – tentative report
* †Leptotriticites
** †Leptotriticites americanus – or unidentified related form
** †Leptotriticites californicus
** †Leptotriticites glenensis
** †Leptotriticites gracilitatus – or unidentified comparable form
** †Leptotriticites hatchetensis – or unidentified related form
** †Leptotriticites hughesensis – or unidentified comparable form
** †Leptotriticites koschmanni – or unidentified comparable form
** †Leptotriticites panamintensis – type locality for species
** †Leptotriticites varius – or unidentified comparable form
** †Leptotriticites warmspringensis – type locality for species
** †Leptotriticites wetherensis
* †Lingula
* Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella †Lingulella
* †Linoproductus
** †Linoproductus nasutus – tentative report
* †Linsleyella – type locality for genus
** †Linsleyella greggi – type locality for species
** †Linsleyella johnsoni – type locality for species
* †Liosotella
** †Liosotella cooperi – type locality for species
* †Liospira
** †Liospira modesta
* †Lissocoelia
** †Lissocoelia ramosa
* †Lissomarginifera
** †Lissomarginifera shastensis
* †Lithostrotion
** †Lithostrotion pauciradiale
* Fossil of the Ordovician trilobite Lonchodomas †Lonchodomas
* †Lophospira
** †Lophospira milleri – or unidentified comparable form
** †Lophospira perangulata
* †Loxonema – tentative report
* †Lytvophyllum – tentative report

## M

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* †Maclurites
** †Maclurites crassa – or unidentified related form
** †Maclurites klamathensis – type locality for species
* †Malpaisia – type locality for genus
** †Malpaisia maceyi – type locality for species
* †Meekella
* †Megakozlowskiella
* †Megalomphala – tentative report
** †Megalomphala contorta
* Illustration (lower right, entry 15) of a fossilized shell in front and side views of the Silurian-Late Devonian brachiopod Meristella †Meristella
** †Meristella robertsensis – or unidentified comparable form
* †Mesocoelia
** †Mesocoelia janus – or unidentified comparable form
* †Mesodouvillina – tentative report
* †Mestoronema
** †Mestoronema marginalis – or unidentified comparable form
* †Mexicaspis
** †Mexicaspis radiatus
* †Mexicella
** †Mexicella grandoculus
** †Mexicella mexicana
** †Mexicella robusta
** †Mexicella stator – tentative report
* †Michelinia
** †Michelinia nelsoni – type locality for species
* †Micromitra
* †Microryctocara
** †Microryctocara nevadensis
* †Monocraterion
* †Monodiexodina – tentative report
* †Mooreoceras
* †Mucophyllum
** †Mucophyllum mcintyrei – or unidentified comparable form
* †Murchisonia
** †Murchisonia bilineata – or unidentified comparable form

## N

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* †Neilsonia
* †Neochonetes
** †Neochonetes pseudoliratus – or unidentified related form
* †Neomultithecopora
** †Neomultithecopora mccutcheonae
** †Neomultithecopora providensis – type locality for species
** †Neomultithecopora sandoi – type locality for species
* Fossilized shell of the Carboniferous-Permian brachiopod Neospirifer †Neospirifer
* †Neosyringopora
** †Neosyringopora multattenuata
* †Nephrolenellus
** †Nephrolenellus multinodus
* †Nevadatubuls
** †Nevadatubuls dunfee
* †Nevadatubulus
** †Nevadatubulus dunfee
* Fossil of the Cambrian trilobite Nevadella †Nevadella
* †Nigribaccinus
** †Nigribaccinus elegans – type locality for species
** †Nigribaccinus giganteus – type locality for species
** †Nigribaccinus nestelli – type locality for species
* †Nileus
** †Nileus hesperaffinis
* †Nucleospira
** †Nucleospira ventricosa – or unidentified comparable form
* †Nuculavus
* †Nuculites
* †Nyella
** †Nyella clinolimbata – tentative report

## O

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* †Obolella
* †OIenellus
** †OIenellus gilberti
* Illustration of a fossil of the Cambrian trilobite Olenellus †Olenellus
** †Olenellus arcuatus
** †Olenellus clarki
** †Olenellus cylindricus
** †Olenellus euryparia
** †Olenellus fowleri – or unidentified comparable form
** †Olenellus frementi
** †Olenellus fremonti
** †Olenellus gilberti
** †Olenellus howelli
** †Olenellus multinodus
** †Olenellus nevadensis
** †Olenellus puertoblancoensis
** †Olenellus terminatus
** †Olenellus transifans – or unidentified comparable form
** †Olenellus transiftans – or unidentified comparable form
** †Olenellus transitans – or unidentified comparable form
** †Olenellus turmalis – or unidentified comparable form
* †Omphalotrochus
** †Omphalotrochus whitneyi – type locality for species
* †Onchocephalites
** †Onchocephalites claytonensis – type locality for species
** †Onchocephalites laevis
* †Ophiletina
** †Ophiletina sublaxa – or unidentified related form
* †Orbiculoidea
** †Orbiculoidea damanensis
* †Orthambonites
** †Orthambonites decipiens
** †Orthambonites eucharis
** †Orthambonites mazousbensis
** †Orthambonites minisculus
** †Orthambonites minusculus
** †Orthambonites patulus
* †Orthidiella
** †Orthidiella extensa
* †Orthophyllum – tentative report
* †Orthotetes
* †Orthotichia
** †Orthotichia nawtawaketensis
* †Oryctocephalites
** †Oryctocephalites resseri
* †Oryctocephalus
** †Oryctocephalus indicus
** †Oryctocephalus nyensis
** †Oryctocephalus orientalis
* †Ovatia

## 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
* †Pachystrophia – tentative report
** †Pachystrophia devexa – or unidentified comparable form
* †Pacificocoelia
* †Paladin
* Palaeoaplysina
* †Palaeomphalus
** †Palaeomphalus olsoni – type locality for species
* †Palaeophycus
* †Palaeophyllum
* †Paleochiton
** †Paleochiton siskiyouensis – type locality for species
* †Palliseria
* †Paraantagmus
** †Paraantagmus latus
* †Parafusulina
** †Parafusulina bakeri – or unidentified comparable form
** †Parafusulina californica
** †Parafusulina cerrogordoensis – type locality for species
** †Parafusulina complexa – type locality for species
** †Parafusulina durhami – or unidentified related form
** †Parafusulina halli – type locality for species
** †Parafusulina juncea – type locality for species
** †Parafusulina klamathensis – type locality for species
** †Parafusulina maleyi
** †Parafusulina mccloudensis – type locality for species
** †Parafusulina nosonensis
** †Parafusulina owensensis – type locality for species
** †Parafusulina potterensis – type locality for species
** †Parafusulina shaksgamensis – or unidentified comparable form
** †Parafusulina splendens
** †Parafusulina ubehebensis – type locality for species
** †Parafusulina virga
* †Paraheritschioides
** †Paraheritschioides californiense – or unidentified related form
** †Paraheritschioides stevensi – type locality for species
* †Paralbertella
* †Paralenorthis
** †Paralenorthis marshalli
** †Paralenorthis parcicrassicostatus – or unidentified comparable form
** †Paralenorthis parvicrassicostata – or unidentified comparable form
** †Paralenorthis parvicrassicostatus – or unidentified comparable form
* †Paraliospira – type locality for genus
** †Paraliospira angulata
** †Paraliospira gradata – type locality for species
** †Paraliospira helena
** †Paraliospira mundula
** †Paraliospira planata – type locality for species
* †Parallelodon
** †Parallelodon cingulatus
** †Parallelodon qinghaiensis
** †Parallelodon verneuilianus
* †Paramesolobus – tentative report
** †Paramesolobus sinuosus – or unidentified comparable form
* †Pararachnastraea
** †Pararachnastraea bellula – type locality for species
** †Pararachnastraea delicata – type locality for species
** †Pararachnastraea mckibbinae – type locality for species
** †Pararachnastraea owensensis – type locality for species
** †Pararachnastraea peggyae – type locality for species
** †Pararachnastraea wilsoni – type locality for species
* †Paraschwagerina
** †Paraschwagerina crassitheca – type locality for species
** †Paraschwagerina elongata – type locality for species
** †Paraschwagerina fairbanksi – type locality for species
** †Paraschwagerina fax
** †Paraschwagerina magna – type locality for species
** †Paraschwagerina tarda – type locality for species
* †Patellispongia
** †Patellispongia oculata – or unidentified comparable form
* †Patriaspirifer
** †Patriaspirifer kobehana
* †Paupospira
** †Paupospira sumnerensis – or unidentified related form
* †Paurorthis
* Life restoration of the Cambrian trilobite Peachella †Peachella
** †Peachella brevispina
** †Peachella iddingsi
* †Peniculauris – report made of unidentified related form or using admittedly obsolete nomenclature
** †Peniculauris bassi
* †Pentamerus
* †Perditocardinia
* †Permophorus
* †Pernopecten
* †Perrinites
** †Perrinites hilli
* †Peruniscus
* †Petalaxis
** †Petalaxis allisonae – type locality for species
** †Petalaxis besti – type locality for species
** †Petalaxis exiguus – type locality for species
** †Petalaxis occidentalis
** †Petalaxis sutherlandi – type locality for species
* †Petrozium
** †Petrozium staufferi – type locality for species
* †Phillipsia
** †Phillipsia nosonensis – type locality for species
* †Pholidops
* †Phragmorthis
** †Phragmorthis buttsi – or unidentified comparable form
* †Phricodothyris
* †Phyllograptus
* Fossilized shell of the Ordovician brachiopod Plaesiomys †Plaesiomys
* †Plagiura
** †Plagiura cerops – or unidentified comparable form
** †Plagiura minor
* †Planolites
* †Plasmopora
** †Plasmopora follis – or unidentified comparable form
* †Platyceras
* †Plectatrypa
* †Plectorthis
** †Plectorthis mazourkaensis
** †Plectorthis patula
* †Poleumita
** †Poleumita octavia
* †Polidevcia
* †Polyplacus
** †Polyplacus kilmeri
* †Polypora
* †Porefieldia
** †Porefieldia robusta
* †Presbynileus
* †Productus
** †Productus keokuk
* Restoration of the Silurian trilobite Proetus †Proetus
* †Proexenocrinus
** †Proexenocrinus inyoensis
* †Progalerus – tentative report
* †Prosolarium
* †Protocalymene
** †Protocalymene mcallisteri
* †Protowentzelella – type locality for genus
** †Protowentzelella cystosa
** †Protowentzelella kunthi
** †Protowentzelella noinskyi
** †Protowentzelella shastensis – type locality for species
** †Protowentzelella variabilis – type locality for species
* †Proturritella
** †Proturritella historicum – or unidentified related form
* †Pseudocheirurus
* †Pseudochusenella
** †Pseudochusenella buttensis – type locality for species
** †Pseudochusenella concisa
** †Pseudochusenella hazzardi – type locality for species
* †Pseudocystophora
** †Pseudocystophora fryi – type locality for species
** †Pseudocystophora wilsoni – type locality for species
* †Pseudofusulina
** †Pseudofusulina accepta – type locality for species
** †Pseudofusulina acuta – type locality for species
** †Pseudofusulina amoena – type locality for species
** †Pseudofusulina ardua – type locality for species
** †Pseudofusulina attenuata – type locality for species
** †Pseudofusulina concisa – type locality for species
** †Pseudofusulina contracta – type locality for species
** †Pseudofusulina decora – type locality for species
** †Pseudofusulina distorta – type locality for species
** †Pseudofusulina elleryensis – type locality for species
** †Pseudofusulina eximia – type locality for species
** †Pseudofusulina extensa – type locality for species
** †Pseudofusulina juncea – type locality for species
** †Pseudofusulina laxa – type locality for species
** †Pseudofusulina meeki – type locality for species
** †Pseudofusulina minuta – type locality for species
** †Pseudofusulina modesta – type locality for species
** †Pseudofusulina monstrosa – type locality for species
** †Pseudofusulina plana – type locality for species
** †Pseudofusulina retusa – type locality for species
** †Pseudofusulina solita – type locality for species
** †Pseudofusulina soluta – type locality for species
** †Pseudofusulina spissa – type locality for species
** †Pseudofusulina tenuis – type locality for species
** †Pseudofusulina tenuitheca – type locality for species
* †Pseudofusulinella
** †Pseudofusulinella aculeata – type locality for species
** †Pseudofusulinella acuminata – type locality for species
** †Pseudofusulinella acuta – type locality for species
** †Pseudofusulinella alta – type locality for species
** †Pseudofusulinella antiqua – type locality for species
** †Pseudofusulinella bellula – type locality for species
** †Pseudofusulinella biconica – type locality for species
** †Pseudofusulinella decora – type locality for species
** †Pseudofusulinella delicata – type locality for species
** †Pseudofusulinella dunbari – type locality for species
** †Pseudofusulinella formosa – type locality for species
** †Pseudofusulinella fragilis – type locality for species
** †Pseudofusulinella fusiformis – type locality for species
** †Pseudofusulinella harbaughi – type locality for species
** †Pseudofusulinella meeki – type locality for species
** †Pseudofusulinella montis
** †Pseudofusulinella moorei – type locality for species
** †Pseudofusulinella munda – type locality for species
** †Pseudofusulinella nitida – type locality for species
** †Pseudofusulinella obtusa – type locality for species
** †Pseudofusulinella occidentalis
** †Pseudofusulinella opima – type locality for species
** †Pseudofusulinella parvula – type locality for species
** †Pseudofusulinella pinguis – type locality for species
** †Pseudofusulinella prima – type locality for species
** †Pseudofusulinella proba – type locality for species
** †Pseudofusulinella pulchella – type locality for species
** †Pseudofusulinella retusa – type locality for species
** †Pseudofusulinella rotunda – type locality for species
** †Pseudofusulinella sera – type locality for species
** †Pseudofusulinella simplex – type locality for species
** †Pseudofusulinella solida – type locality for species
** †Pseudofusulinella solita – type locality for species
** †Pseudofusulinella spicata – type locality for species
** †Pseudofusulinella splendens – type locality for species
** †Pseudofusulinella thompsoni – type locality for species
** †Pseudofusulinella tumida – type locality for species
** †Pseudofusulinella ventricosa – type locality for species
** †Pseudofusulinella venusta – type locality for species
** †Pseudofusulinella wheeleri – type locality for species
* †Pseudomera
** †Pseudomera barrandei – or unidentified comparable form
* †Pseudoschwagerina
** †Pseudoschwagerina arta
** †Pseudoschwagerina californica – type locality for species
** †Pseudoschwagerina gerontica – or unidentified comparable form
** †Pseudoschwagerina robusta
** †Pseudoschwagerina roeseleri
** †Pseudoschwagerina uddeni
* †Ptarmiganoides
** †Ptarmiganoides hexacantha
** †Ptarmiganoides propiqua – or unidentified comparable form
* Fossil of the mysterious Ediacaran animal Pteridinium †Pteridinium – tentative report
* †Ptychocaulus
** †Ptychocaulus rodneyi – type locality for species
* †Ptychopleurella
** †Ptychopleurella mediocostata – or unidentified comparable form
** †Ptychopleurella uniplicata – or unidentified related form
* †Ptyocephalus
** †Ptyocephalus declevita – or unidentified comparable form
* †Punctospirifer

## 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
* †Radiotrabeculopora
** †Radiotrabeculopora reticulata
* †Raphispira
** †Raphispira plena – or unidentified comparable form
* †Raymondaspis
** †Raymondaspis vespertina
* †Remopleurides
* †Remopleuridiella
* †Repinaella
* †Replicoskenidioides
** †Replicoskenidioides rodneygreggi
* †Reticulariina – tentative report
** †Reticulariina laxa
* †Rhabdomeson
* †Rhipidomella
* †Rhynchopora
** †Rhynchopora taylori
* †Rhysostrophia
** †Rhysostrophia nevadensis
** †Rhysostrophia occidentalis
* †Rigbyetia
** †Rigbyetia obconica
* †Rossoceras
* †Rotellomphalus
** †Rotellomphalus tardus – or unidentified comparable form
* †Ruedemannia
** †Ruedemannia lirata – or unidentified comparable form
* †Ruedemannoceras
* †Rugosochonetes
** †Rugosochonetes californicus
** †Rugosochonetes californucus
* Fossil of the arthropod burrow ichnogenus Rusophycus †Rusophycus

## 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
* †Salopina
** †Salopina horseshoensis
* †Sandolasma
** †Sandolasma mckassoni – type locality for species
** †Sandolasma stonei
* †Scaphorthis
* †Schistometopus
* †Schizodus
* †Schizonema
** †Schizonema nisis – or unidentified comparable form
* †Schizophoria
** †Schizophoria bisinuata – or unidentified comparable form
** †Schizophoria compacta – or unidentified comparable form
* †Schubertella
** †Schubertella kingi
** †Schubertella minuta – type locality for species
** †Schubertella pusilla – type locality for species
* †Schuchertella
* †Schwagerina
** †Schwagerina aculeata
** †Schwagerina acuminata – type locality for species
** †Schwagerina amoena – type locality for species
** †Schwagerina arta – type locality for species
** †Schwagerina aspera – type locality for species
** †Schwagerina astricta – type locality for species
** †Schwagerina bassensis – type locality for species
** †Schwagerina bayhaensis – type locality for species
** †Schwagerina biconica – type locality for species
** †Schwagerina birklundensis – type locality for species
** †Schwagerina concinna – type locality for species
** †Schwagerina convexa
** †Schwagerina corpulenta – type locality for species
** †Schwagerina curta – type locality for species
** †Schwagerina cylindrica – type locality for species
** †Schwagerina davisi – or unidentified comparable form
** †Schwagerina demissa – type locality for species
** †Schwagerina elkoensis – or unidentified comparable form
** †Schwagerina eximia – type locality for species
** †Schwagerina fiski – type locality for species
** †Schwagerina harbaughi – type locality for species
** †Schwagerina humilis – type locality for species
** †Schwagerina juncea – type locality for species
** †Schwagerina klamathensis – type locality for species
** †Schwagerina laudoni – type locality for species
** †Schwagerina longissimoidea
** †Schwagerina mccloudensis – type locality for species
** †Schwagerina menziesi – or unidentified comparable form
** †Schwagerina modica
** †Schwagerina moorei – type locality for species
** †Schwagerina providens
** †Schwagerina providnes
** †Schwagerina pseudoprinceps – type locality for species
** †Schwagerina pugunculus – or unidentified comparable form
** †Schwagerina pulchella – type locality for species
** †Schwagerina remissa – type locality for species
** †Schwagerina rotunda – type locality for species
** †Schwagerina schencki – type locality for species
** †Schwagerina soluta – type locality for species
** †Schwagerina spicata – type locality for species
** †Schwagerina turgida – type locality for species
** †Schwagerina ventricosa – type locality for species
** †Schwagerina vervillei
** †Schwagerina wellsensis – or unidentified comparable form
** †Schwagerina wheeleri – type locality for species
* †Scolithes
* †Semicostella
* †Septospirifer – tentative report
* †Setigerites
* †Shamovella
* †Shastalasma
** †Shastalasma coogani – type locality for species
** †Shastalasma gavini – type locality for species
** †Shastalasma woodi – type locality for species
* †Shastaphyllum – type locality for genus
** †Shastaphyllum schucherti – type locality for species
* †Sigmelasma – type locality for genus
** †Sigmelasma pantherae – type locality for species
* †Siskiyouspira – type locality for genus
** †Siskiyouspira vostokovae – type locality for species
* †Skenidioides
** †Skenidioides glindmeyeri – type locality for species
** †Skenidioides mulifarius
** †Skenidioides multifarius
* †Skinnerella
** †Skinnerella davydovi – type locality for species
** †Skinnerella hexagona – type locality for species
** †Skinnerella mcallisteri – type locality for species
* †Spinuliplica
* †Spinulothele
* Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer †Spirifer
** †Spirifer brazerianus
* †Spiriferella
* †Spiriferellina
* †Spiriferina – tentative report
* †Squamularia – report made of unidentified related form or using admittedly obsolete nomenclature
* †Stacheoceras
** †Stacheoceras antiquum – or unidentified related form
** †Stacheoceras gordoni – type locality for species
* †Stearoceras
** †Stearoceras phosphoriense – or unidentified related form
* †Stenoloron – tentative report
** †Stenoloron fasciata – or unidentified related form
* †Stenoscisma
** †Stenoscisma venustum
* †Stereostylus
** †Stereostylus bollibokkensis – type locality for species
* †Stewartina
** †Stewartina convexa
** †Stewartina magnifica – type locality for species
** †Stewartina multispira
** †Stewartina texana
** †Stewartina uber
** †Stewartina ultimata – type locality for species
* †Straparollus
* †Streblochondria
* †Streblopteria
* †Streptelasma
* †Streptosolen
* †Striatifera
* †Striatopora – tentative report
** †Striatopora gwenensis – or unidentified comparable form
* †Stricklandia – tentative report
* †Strigigenalis
* †Stylonema
** †Stylonema potens – or unidentified comparable form
* †Swantonia
* Life restoration of the mysterious Ediacaran animal Swartpuntia †Swartpuntia – or unidentified comparable form
* †Symphysurina
* †Syringaxon
* †Syringopora
* †Syspacephalus
** †Syspacephalus granulosus – tentative report
** †Syspacephalus obscurus
** †Syspacephalus variosus – type locality for species

## 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
* †Taphrhelminthopsis
** †Taphrhelminthopsis nelsoni
* †Taphrorthis – tentative report
* †Temnodiscus – tentative report
** †Temnodiscus euryomphalus
* †Thairoplax
** †Thairoplax merriami – type locality for species
* †Thamniscus – report made of unidentified related form or using admittedly obsolete nomenclature
* †Thamnosia
** †Thamnosia arctica
* †Thompsonella
** †Thompsonella cylindrica – type locality for species
** †Thompsonella rugosa – type locality for species
* †Timaniella
** †Timaniella pseudocamerata
* †Tonopahella – type locality for genus
** †Tonopahella goldfieldensis – type locality for species
** †Tonopahella walcotti
* †Torynifer
* †Trematospira
* †Trepospira
* Illustration of a fossil of the Cambrian trilobite Trinodus †Trinodus
** †Trinodus clusus – or unidentified comparable form
* †Triticites
** †Triticites bensonensis
** †Triticites brevis – type locality for species
** †Triticites burgessae – or unidentified comparable form
** †Triticites buttensis
** †Triticites californicus
** †Triticites cellamagnus
** †Triticites elegantoides
** †Triticites gigantocellus
** †Triticites hermanni – type locality for species
** †Triticites invenustus – type locality for species
** †Triticites muddiensis
** †Triticites mulleri – type locality for species
** †Triticites occidentalis – type locality for species
** †Triticites schencki – type locality for species
** †Triticites tumentis – type locality for species
** †Triticites usitatus – type locality for species
** †Triticites ventricosus – or unidentified related form
** †Triticites viribus – type locality for species
* †Trocholites – tentative report
* †Trochonema
** †Trochonema liljevalli – type locality for species
* †Trochonemella – tentative report
** †Trochonemella mikulici – type locality for species
* †Tschussovskenia
** †Tschussovskenia connorsensis

## 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
* †Unispirifer

## 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
* †Valcourea
** †Valcourea plana – or unidentified comparable form
* †Verneuilia
* †Volborthella
** †Volborthella tenuis
* †Volocephalina
** †Volocephalina connexa
** †Volocephalina contracta

## 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
* †Waagenoconcha – tentative report
* †Waagenophyllum
** †Waagenophyllum klamathensis – type locality for species
* Fossil of the Cambrian trilobite Wanneria †Wanneria
* †Waucobella
** †Waucobella nelsoni
* †Wellerella
** †Wellerella hemiplicata – or unidentified comparable form
** †Wellerella rotunda – or unidentified comparable form
* †Wenkchemnia
** †Wenkchemnia spinicollus – tentative report
** †Wenkchemnia sulcata
* †Westgardia
** †Westgardia gigantea – type locality for species
* †Wexolina – type locality for genus
** †Wexolina tombstonensis – type locality for species
* †Whitfieldella – tentative report
* †Wilsonastraea – type locality for genus
** †Wilsonastraea fluvius – type locality for species
** †Wilsonastraea parva – type locality for species
** †Wilsonastraea smithi – type locality for species
* †Wintunastraea – type locality for genus
** †Wintunastraea stanleyi – type locality for species
* †Wyattia

## 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
* Fossilized shells of the ammonoid cephalopod Xenodiscus †Xenodiscus
** †Xenodiscus carbonarius – or unidentified related form
* †Xenostegium
* †Xestotrema
** †Xestotrema pulchrum

## 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
* †Yakovlevia
** †Yakovlevia californica – type locality for species

## 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
* †Zacanthoides
* †Zacanthopsis
* †Zelophyllum