# List of the Paleozoic life of Idaho

This list of the Paleozoic life of Idaho contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Idaho and are between 541 and 252.17 million years of age.

## A

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* F
* G
* H
* I
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* M
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* U
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* †Acrothele
** †Acrothele affinis
** †Acrothele artemis
** †Acrothele parilis – type locality for species
** †Acrothele speciosa – type locality for species
* †Acrothyra
** †Acrothyra minor
* †Acrotreta
** †Acrotreta definita
** †Acrotreta eucharis – type locality for species
** †Acrotreta levata
** †Acrotreta nitens – type locality for species
** †Acrotreta sulcata
* †Adrianites
* Assemblage of fossils of the Cambrian trilobite Agnostus †Agnostus
** †Agnostus bonnerensis – type locality for species
** †Agnostus lautus – type locality for species
* †Albertella
** †Albertella sampsoni – type locality for species
* †Allanaria
** †Allanaria engelmanni
* †Alokistocare
** †Alokistocare euchare – type locality for species
** †Alokistocare idahoense
** †Alokistocare laticaudum
** †Alokistocare nactum – type locality for species
** †Alokistocare natale – type locality for species
** †Alokistocare noduliferum – type locality for species
** †Alokistocare normale – type locality for species
** †Alokistocare notatum – type locality for species
** †Alokistocare nothum – type locality for species
** †Alokistocare septum
** †Alokistocare spencense
* †Alokistocarella
** †Alokistocarella occidens – type locality for species
** †Alokistocarella spencei
* †Amblycranium
** †Amblycranium cornutum – type locality for species
** †Amblycranium populus – type locality for species
** †Amblycranium variabile – type locality for species
* †Ambothyris
** †Ambothyris utahensis – type locality for species
* †Amechilus
** †Amechilus palaora – type locality for species
* †Amphipora
* †Amplexizaphrenitis
* †Amplexizaphrentis
* †Amplexograptus
** †Amplexograptus latus – or unidentified related form
** †Amplexograptus manitoulinensis – or unidentified related form
** †Amplexograptus perexcavatus
* †Amplexus
* †Ampyxina
* † Ananias
** †Ananias nevadensis – or unidentified related form
* †Anazyga
** †Anazyga recurvirostra – or unidentified comparable form
* †Ancenochilus
* †Anidanthus
** †Anidanthus echaris
** †Anidanthus eucharis – type locality for species
* †Anomalorthis
* †Anthracospirifer
** †Anthracospirifer arcoensis – type locality for species
** †Anthracospirifer curvilateralis
** †Anthracospirifer leidyi
** †Anthracospirifer occiduus
** †Anthracospirifer shawi
* †Antiquatonia
** †Antiquatonia sulcatus – or unidentified comparable form
* †Apatokephalus – tentative report
* †Apheorthis
** †Apheorthis meeki – or unidentified comparable form
* †Appendispinograptus
** †Appendispinograptus longispinus
* †Apterrinella
* †Arachniograptus
** †Arachniograptus laqueus
* †Archaeocyathus
* Archaeolithophyllum
* †Asaphellus – tentative report
** †Asaphellus eudocia
* †Astartella
** †Astartella subquadrata
* †Asthenospongia – type locality for genus
** †Asthenospongia acantha – type locality for species
* Fossilized shell of the Late Ordovician-Carboniferous brachiopod Atrypa †Atrypa
** †Atrypa oneidensis – type locality for species
** †Atrypa putilla – or unidentified related form
* †Aulopora
* †Auloprotonia
* †Austinella
** †Austinella whitfieldi – or unidentified related form
* †Aviculopecten
** †Aviculopecten kaibabensis – or unidentified comparable form
* † Avonia

## B

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* †Babylonites
** †Babylonites conoideus
** †Babylonites ferrieri – type locality for species
* †Bakevellia – tentative report
* †Basilicus – tentative report
* †Bathymyonia
** †Bathymyonia nevadensis – type locality for species
* †Bathyuriscus
** †Bathyuriscus atossa
** †Bathyuriscus politus – type locality for species
* †Bearriverops
** †Bearriverops alsacharovi
** †Bearriverops borderinnensis
** †Bearriverops loganensis – type locality for species
* †Bellaspis – tentative report
* †Bellefontia
** †Bellefontia acuminiferentis
** †Bellefontia chamberlaini
* †Bensbergia
** †Bensbergia altivolvis
* †Benthamaspis
** †Benthamaspis obrepta
* †Billingsella
* †Blastoidocrinus
** †Blastoidocrinus carchariaedens – or unidentified comparable form
* †Brachythyris
** †Brachythyris subcardiiformis
* †Bythicheilus
** †Bythicheilus alveatum
** †Bythicheilus typicum

## C

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* †Camarotechia
* †Cancrinella
** †Cancrinella phosphatica – type locality for species
* †Caninia
** †Caninia excentrica
* †Cardiograptus
* †Cardiomorpha – tentative report
* †Chaetetes
* †Chancia
** †Chancia angusta
** †Chancia ebdome
** †Chancia evax
* †Chonetes
** †Chonetes logani
* †Clappaspis
** †Clappaspis coriacea
** †Clappaspis dotis
** †Clappaspis idahoensis
** †Clappaspis lanata
** †Clappaspis spencei
* †Clavaspidella
** †Clavaspidella bithus
** †Clavaspidella minor – type locality for species
* †Cleiothryidina
* †Cleiothyridina
** †Cleiothyridina miettensis
** †Cleiothyridina obmaxima
** †Cleiothyridina sublamellosa
** †Cleiothyridina tenuilineata
* †Cleiothyridinia
* †Clelandia
** †Clelandia utahensis – type locality for species
* Assemblage of fossils of the Cambrian graptolite Climacograptus †Climacograptus
** †Climacograptus bicornis
** †Climacograptus brevis
** †Climacograptus caudatus
** †Climacograptus hastatus
** †Climacograptus innotatus
** †Climacograptus minimus – or unidentified comparable form
** †Climacograptus mohawkensis – or unidentified comparable form
** †Climacograptus raricaudatus – or unidentified comparable form
** †Climacograptus riddellensis
** †Climacograptus scalaris – or unidentified comparable form
** †Climacograptus tabuliferus – or unidentified comparable form
** †Climacograptus tubuliferus
** †Climacograptus uncinatus
* †Clinopistha
* Fossilized shell of the Late Devonian-Permian brachiopod Composita †Composita
** †Composita humilis
** †Composita humulis
** †Composita idahoensis – type locality for species
** †Composita mira – or unidentified comparable form
** †Composita sigma
** †Composita subquadrata
** †Composita subtilita – or unidentified comparable form
** †Composita sulcata
* †Corynoides
** †Corynoides calicularis
* †Croixana
* †Crurithyris
** †Crurithyris arcuata – type locality for species
** †Crurithyris arcuatus
* †Cryptograptus
** †Cryptograptus tricornis
* †Cyathaxonia
* †Cyclogyra – tentative report
* †Cyrtina
** †Cyrtina acutirostris
** †Cyrtina billingsi – or unidentified comparable form
* †Cyrtograptus
** †Cyrtograptus grayae – or unidentified comparable form
** †Cyrtograptus kirki
** †Cyrtograptus laqueus
** †Cyrtograptus rigidus
* †Cyrtorostra
** †Cyrtorostra varicostata
* †Cystidictya
* †Cystodictya
* †Cythaxonia

## D

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* †Daubichites
** †Daubichites brevicostatus – type locality for species
* †Demarezites
** †Demarezites furnishi – type locality for species
* †Derbyia
* †Diaphragmus
** †Diaphragmus nivosus
* †Dibunophyllum
* †Dicellograptus
** †Dicellograptus alector – type locality for species
** †Dicellograptus angulatus – or unidentified comparable form
** †Dicellograptus divaricatus
** †Dicellograptus elegans – or unidentified comparable form
** †Dicellograptus ornatus
** †Dicellograptus sextans
* †Diceromyonia
** †Diceromyonia tersa – or unidentified comparable form
* †Diconularia
** †Diconularia meadepeakensis – type locality for species
* †Dicranograptus
** †Dicranograptus brevicaulis – or unidentified comparable form
** †Dicranograptus contortus
** †Dicranograptus kirki – or unidentified comparable form
** †Dicranograptus nicholsoni
** †Dicranograptus spinifer
* †Dictyoclostus
* †Dictyoclustus – report made of unidentified related form or using admittedly obsolete nomenclature
* †Dictyonema
* Fossil of the Middle Ordovician graptolite Didymograptus †Didymograptus
** †Didymograptus extensus
** †Didymograptus gemminus – or unidentified comparable form
** †Didymograptus gracilis
** †Didymograptus protobifidus
* †Dielasma
* †Dimegelasma
* †Diparelasma
** †Diparelasma typicum – or unidentified comparable form
* †Diphyphyllum
* †Diplograptus
* †Dolichometopsis
** †Dolichometopsis alia – type locality for species
** †Dolichometopsis comis – type locality for species
** †Dolichometopsis communis – type locality for species
** †Dolichometopsis gravis – type locality for species
** †Dolichometopsis lepida – type locality for species
** †Dolichometopsis media – type locality for species
** †Dolichometopsis potens – type locality for species
** †Dolichometopsis poulseni – type locality for species
** †Dolichometopsis propinqua – type locality for species
** †Dolichometopsis stella – type locality for species
* †Dorispira
** †Dorispira arguta – type locality for species
** †Dorispira burlingi – type locality for species
** †Dorispira pocatelloensis – type locality for species
* †Dorlodotia
* †Dyscritella
** †Dyscritella bogatensis
* †Dyscritellina
** †Dyscritellina grandicora – type locality for species
** †Dyscritellina multispinosa

## E

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* †Echinauris
* †Echinoconchus
** †Echinoconchus alternatus
* †Edmondia
** †Edmondia phosphatica – type locality for species
** †Edmondia phosphoriensis – or unidentified comparable form
* †Ehmaniella
** †Ehmaniella maladensis
* †Ekvasophyllum
* Fossils at different stages of development of the Cambrian trilobite Elrathia †Elrathia
** †Elrathia idahoensis – type locality for species
** †Elrathia longiceps – type locality for species
** †Elrathia offula
** †Elrathia rara
** †Elrathia sampsoni – type locality for species
** †Elrathia spencei
* †Elrathina
** †Elrathina spencei – or unidentified comparable form
* †Emanuella
* †Endothyra
* †Eochonetes
** †Eochonetes voldemortus – type locality for species
* †Eocrinus
** †Eocrinus longidactylus
* †Eolissochonetes
** †Eolissochonetes pseudoliratus
* †Eomartiniopsis
** †Eomartiniopsis rostrata
* †Eugonophyllum
* †Eumetria
** †Eumetria costata
* Fossilized shell of the Silurian-Permian sea snail Euomphalus †Euomphalus
** †Euomphalus subplanus

## F

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* †Faberophyllum
* †Faberophylum
* †Faberphyllum
* †Fenestella
* †Fistulipora
* †Flectihystricurus
** †Flectihystricurus acumennasus – type locality for species
** †Flectihystricurus flectimembrus – type locality for species
* †Flexaria

## G

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* †Gastrioceras – report made of unidentified related form or using admittedly obsolete nomenclature
** †Gastrioceras williamsi
* †Genalaticurus
** †Genalaticurus genalatus – type locality for species
* †Girtyella
* †Girtypecten
* †Girvanella
* †Glabrocingulum – tentative report
* †Glassoceras
** †Glassoceras bransonorum – type locality for species
* †Globivalvulina
* †Glossograptus
** †Glossograptus hincksii
* †Glossopleura
** †Glossopleura bion
** †Glossopleura intermedia – type locality for species
** †Glossopleura similaris
* †Glyptograptus
** †Glyptograptus altus
** †Glyptograptus euglyphus
** †Glyptograptus tamariscus
* †Glyptorthis
** †Glyptorthis pulchra – or unidentified comparable form
* Fossil of the Cambrian echinoderm Gogia †Gogia
** †Gogia hobbsi
** †Gogia palmeri
* †Goniograptus
** †Goniograptus geometricus
* †Goniophrys
** †Goniophrys prima – type locality for species
* †Gosseletina
** †Gosseletina idahoensis

## H

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* †Hallograptus
* †Haplophrentis
** †Haplophrentis carinatus – type locality for species
* †Hedraites
* †Helcionella
* Life restoration of the Permian Chimaera relative Helicoprion †Helicoprion
** †Helicoprion davisii – type locality for species
** †Helicoprion ergassaminon – type locality for species
* †Hesperonomia
** †Hesperonomia dinorthoides
* †Hillyardina
** †Hillyardina marginauctum – type locality for species
** †Hillyardina semicylindrica – type locality for species
* †Hintzecurus
** †Hintzecurus paragenalatus – type locality for species
* †Hintzeia
** †Hintzeia celsaora – type locality for species
* †Homalophyllites
** †Homalophyllites subcrassus
* †Hustedia
* †Hustedograptus
** †Hustedograptus teretiusculus
* Fossilized shells of the Cambrian-Permian brachiopod relative Hyolitha †Hyolithes
** †Hyolithes ornatellus
** †Hyolithes prolixus – type locality for species
* †Hypothetica
** †Hypothetica rawi – type locality for species
* †Hystricurus
** †Hystricurus contractus – type locality for species
** †Hystricurus oculilunatus – type locality for species
** †Hystricurus robustus – type locality for species

## I

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* †Idahoia
* †Inflatia
** †Inflatia inflata – or unidentified comparable form
* †Inglefieldia
* †Iphidella
** †Iphidella grata
** †Iphidella maladensis
** †Iphidella pannula – or unidentified comparable form
* †Isograptus
** †Isograptus victoriae

## J

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* †Juresania

## K

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* †Kaskia
* †Kazakhstania
* †Kochaspis
** †Kochaspis maladensis – type locality for species
* †Kochiella
* †Kochina
** †Kochina venusta – type locality for species
** †Kochina vestita – type locality for species
** †Kochina wasatchensis – type locality for species
* †Kochiproductus
** †Kochiproductus longus – or unidentified comparable form
* †Komiella
** †Komiella ostiolata – type locality for species
* Fossil of the Cambrian trilobite Kootenia †Kootenia
** †Kootenia acicularis – type locality for species
** †Kootenia brevispina – type locality for species
** †Kootenia convoluta – type locality for species
** †Kootenia granulosa – type locality for species
** †Kootenia idahoensis
** †Kootenia maladensis – type locality for species
** †Kootenia nitida – type locality for species
** †Kootenia spencei
* †Kozlowskia

## L

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* †Lasiograptus
** †Lasiograptus harknessi
* †Leiorhynchoidea
** †Leiorhynchoidea carbonifera
* †Leiorhynchus
** †Leiorhynchus carboniferum
** †Leiorhynchus weeksi
* †Leiostegium
** †Leiostegium manitouense
* †Leptagonia
** †Leptagonia analoga
** †Leptagonia missouriensis
* †Leptograptus
** †Leptograptus demissus – type locality for species
** †Leptograptus flaccidus
* †Licnocephala
** †Licnocephala bicornuta – type locality for species
** †Licnocephala cavigladius
** †Licnocephala ovata – type locality for species
* †Lingula
** †Lingula carbonaria
* Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella †Lingulella
** †Lingulella eucharis – type locality for species
** †Lingulella idahoensis – type locality for species
* †Linoproductus
* †Liosotella – or unidentified related form
* †Lithostrontionella
* †Lithostrotion
* †Lithostrotionella
** †Lithostrotionella pennsylvanicum
** †Lithostrotionella stelcki
* †Lithstrotionella
** †Lithstrotionella pennsylvanicum
* †Loganiella – type locality for genus
** †Loganiella johnsoni – type locality for species
* †Loganograptus
** †Loganograptus logani
* †Lordorthis – type locality for genus
** †Lordorthis variabilis – type locality for species

## M

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* †Macropotamorhyncus
** †Macropotamorhyncus insolitus
* †Macropyge
** †Macropyge gladiator – type locality for species
* †Maeandrograptus
** †Maeandrograptus tau
* Restoration of the mysterious Cambrian life-form Margaretia †Margaretia
** †Margaretia angustata – type locality for species
* †Martinia
* †Menoparia
** †Menoparia genalunata – type locality for species
** †Menoparia lunalata – type locality for species
* †Metabowmania
** †Metabowmania latilimbata – or unidentified comparable form
* †Metriophyllum
** †Metriophyllum deminutivum
* †Michelinia
* †Micromitra
** †Micromitra haydeni
** †Micromitra lepida
* †Minkella
* †Monoclimacis
** †Monoclimacis griestoniensis – or unidentified related form
* Fossils of the Early Devonian graptolite Monograptus †Monograptus
** †Monograptus argutus – or unidentified comparable form
** †Monograptus convolutus
** †Monograptus decipiens – or unidentified comparable form
** †Monograptus flemingii – or unidentified comparable form
** †Monograptus leptotheca – or unidentified comparable form
** †Monograptus lobiferus
** †Monograptus sedgwickii
* †Mooreoceras – tentative report
* †Morania
* †Morozoviella
** †Morozoviella praecurriensis

## N

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* †Nanorthis – tentative report
* Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis †Naticopsis
** †Naticopsis tayloriana – type locality for species
* †Nemagraptus
** †Nemagraptus gracilis – or unidentified comparable form
* †Neoeridotrypella
** †Neoeridotrypella pulchra
* †Neospirifer
* †Neurograptus
** †Neurograptus margaritatus
* †Niobe – tentative report
* †Nuculopsis
** †Nuculopsis montpelierensis – type locality for species

## O

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* †Obolus
* †Oelandiella
** †Oelandiella aequa – type locality for species
* †Ogygopsis
** †Ogygopsis magna – type locality for species
** †Ogygopsis typicalis
* Fossil of the Cambrian trilobite Olenoides †Olenoides
** †Olenoides maladensis
* †Orbiculoidea
** †Orbiculoidea missouriensis
** †Orbiculoidea wyomingensis
* †Orbinaria
* †Orthograptus
** †Orthograptus calcaratus
** †Orthograptus pageanus
** †Orthograptus quadrimucronatus
** †Orthograptus truncatus
** †Orthograptus whitfieldi
* †Orthoretiolites
** †Orthoretiolites hami
* †Orthotetes
** †Orthotetes kaskaskiensis
* †Orthotheca
** †Orthotheca sola
* †Oryctocara – type locality for genus
** †Oryctocara geikei
** †Oryctocara geikiei – type locality for species
* †Oryctocare
* †Oryctocephalites
** †Oryctocephalites typicalis – type locality for species
* †Oryctocephalus
** †Oryctocephalus maladensis – type locality for species
** †Oryctocephalus walcotti – type locality for species
* †Ovatia
* †Overtonia

## P

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* †Pachyaspis
** †Pachyaspis typicalis – type locality for species
* †Pachycranium
** †Pachycranium faciclunis – type locality for species
* †Paenebeltella
** †Paenebeltella vultulata – type locality for species
* Fossil of the Cambrian trilobite Pagetia †Pagetia
** †Pagetia clytia
** †Pagetia fossula – type locality for species
** †Pagetia maladensis – type locality for species
** †Pagetia rugosa
* †Palaeacis
** †Palaeacis cuneiformis
* Palaeoaplysina
* †Palaeocoryne
* †Palaeoneilo
** †Palaeoneilo mcchesneyana – type locality for species
* †Paleocoryne
* †Parahystricurus
** †Parahystricurus carinatus – type locality for species
** †Parahystricurus fraudator – type locality for species
** †Parahystricurus oculirotundus – type locality for species
** †Parahystricurus pustulosus – type locality for species
* †Paraorthograptus
** †Paraorthograptus pacificus
* †Parisograptus
** †Parisograptus caduceus
* †Paterina
** †Paterina hirta – type locality for species
* Illustration of a fossilized shell in multiple views of the Paleozoic mollusc Pelagiella. †Pelagiella
* †Peltabellia
** †Peltabellia peltabella – type locality for species
* †Peneckiella
* †Penniretepora
* †Pericyclus
** †Pericyclus decipiens – type locality for species
* †Permastraea
** †Permastraea solida
* †Peronopsis
** †Peronopsis bonnerensis
* †Perrinites
** †Perrinites hilli
* †Petalograptus
** †Petalograptus minor
* †Petigurus – tentative report
* Fossil of the Early Ordovician graptolite Phyllograptus †Phyllograptus
** †Phyllograptus angustifolius
** †Phyllograptus anna
** †Phyllograptus ilicifolius
* †Pilekia – tentative report
* †Plaesiomys
** †Plaesiomys subquadrata
* †Platyceras
* †Platycrinites
* †Platycrinus
* Fossilized shell of the Middle Ordovician-Silurian brachiopod Platystrophia †Platystrophia
** †Platystrophia equiconvexa – or unidentified comparable form
* †Pleurograptus
** †Pleurograptus linearis
* †Polidevcia
** †Polidevcia obesa
* †Poliella
** †Poliella anteros
** †Poliella caranus
* †Politicurus
** †Politicurus politus – type locality for species
* †Polypora
* †Poulsenia
** †Poulsenia granosa – type locality for species
** †Poulsenia occidens – type locality for species
* †Primaspis
* †Prodentalium
** †Prodentalium canna
* Restoration of the Silurian trilobite Proetus †Proetus
* †Prolecanites – tentative report
** †Prolecanites lyoni
* †Prospira
** †Prospira albapinensis – or unidentified comparable form
* †Protoconchioides
** †Protoconchioides douli – type locality for species
* †Protopliomerella
** †Protopliomerella contracta
* †Protospongia
* †Prozacanthoides
** †Prozacanthoides aequus – type locality for species
** †Prozacanthoides alatus – type locality for species
** †Prozacanthoides decorosus – type locality for species
** †Prozacanthoides exilis – type locality for species
** †Prozacanthoides optatus – type locality for species
* †Psalikilopsis
** †Psalikilopsis cuspidicauda – type locality for species
* †Psalikilus
** †Psalikilus typicum – type locality for species
* †Pseudagnostus
* †Pseudisograptus
** †Pseudisograptus dumosus
* †Pseudobatostomella
** †Pseudobatostomella decora
** †Pseudobatostomella kamiensis
* †Pseudoclelandia
** †Pseudoclelandia cornupsittaca – type locality for species
** †Pseudoclelandia fluxafissura – type locality for species
** †Pseudoclelandia lenisora – type locality for species
* †Pseudoclimacograptus
** †Pseudoclimacograptus scharenbergi
* †Pseudocystophora
** †Pseudocystophora complexa
* †Pseudodorlodotia
* †Pseudogastrioceras
* †Pseudohystricurus
** †Pseudohystricurus obesus – type locality for species
** †Pseudohystricurus orbus – type locality for species
** †Pseudohystricurus rotundus – type locality for species
* †Pseudomonotis
* †Ptarmigania
** †Ptarmigania agrestis – type locality for species
** †Ptarmigania altilis – type locality for species
** †Ptarmigania aurita – type locality for species
** †Ptarmigania dignata – type locality for species
** †Ptarmigania exigua – type locality for species
** †Ptarmigania germana – type locality for species
** †Ptarmigania natalis – type locality for species
** †Ptarmigania ornata – type locality for species
** †Ptarmigania sobrina – type locality for species
* †Ptychaspis
* †Pugnoides
** †Pugnoides quinqueplecis
* †Punctospirifer
** †Punctospirifer solidirostris
** †Punctospirifer transversus
* †Pyraustocranium
** †Pyraustocranium orbatum – type locality for species

## 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
* †Quadratia
** †Quadratia hirsutiformis

## 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
* †Rafinesquina – tentative report
* †Rasettia – tentative report
* †Rectograptus
** †Rectograptus amplexicaulis
* †Remopleuridiella
** †Remopleuridiella caudalimbata – type locality for species
* †Reteoeraotus
* †Reteograptus
** †Reteograptus geinitzianus
** †Reteograptus pulcherrimus – or unidentified comparable form
* †Reticulariina
** †Reticulariina spinosa
* †Rhipidomella
** †Rhipidomella arkansana
** †Rhipidomella diminutiva
** †Rhipidomella missouriensis
** †Rhipidomella nevadensis
* †Rhombopora
* †Rhynchopora
** †Rhynchopora taylori – type locality for species
* †Rhyncopora
* †Rhynoleichus
** †Rhynoleichus weeksi
* †Rossaspis
** †Rossaspis superciliosa – type locality for species
* †Rossicurus
* †Rotopericyclus
** †Rotopericyclus pinyonensis – type locality for species
* †Rugosochonetes
** †Rugosochonetes loganensis – or unidentified comparable form
* †Ruzhencevia
** †Ruzhencevia incrustata
* †Rylstonia

## 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
* †Sanguinolites
** †Sanguinolites carbonaria – type locality for species
* †Saratogia
* †Scaphellina – tentative report
* †Schistometopus – type locality for genus
** †Schistometopus typicalis – type locality for species
* †Schizodus
** †Schizodus bifidus
** †Schizodus ferrieri – type locality for species
* †Schizograptus
* †Schizophoria
** †Schizophoria depressa
** †Schizophoria poststriatula – or unidentified comparable form
** †Schizophoria resupinata
* †Schuchertella
* †Scinocephalus
** †Scinocephalus quadrihastatus – type locality for species
** †Scinocephalus solitecti – type locality for species
* Fossil of the Cambrian priapulid worm Selkirkia †Selkirkia
** †Selkirkia spencei
* †Septopora
* †Setigerites
* †Shamovella
* †Siphonodendron
* †Spencia
** †Spencia plena
* †Sphenosteges
* †Spirifer
** †Spirifer albertensis
** †Spirifer bifurcatus
** †Spirifer biplicoides
** †Spirifer brazerianus
** †Spirifer forbesi
** †Spirifer osagensis
** †Spirifer pellaensis
** †Spirifer rowleyi
* †Spiriferina
* †Spirolegoceras – type locality for genus
** †Spirolegoceras fischeri – type locality for species
* †Stacheoceras
** †Stacheoceras sexlobatum – type locality for species
* †Stachyodes
* †Stauroholcus
** †Stauroholcus typicalis
* †Stenoconites – type locality for genus
** †Stenoconites idahoensis – type locality for species
* †Stenolobulites
** †Stenolobulites simulator – type locality for species
** †Stenolobulites sinuosus – type locality for species
* †Stenopora
** †Stenopora grandis
* †Straparollus
** †Straparollus ophirensis
* †Stratifera
** †Stratifera brazeriana
* †Streblochondria
* †Streblopteria
** †Streblopteria montpelierensis – type locality for species
* †Striatifera
* Fossilized shell of the Ordovician-Silurian brachiopod Strophomena †Strophomena
* †Subglobosochonetes
** †Subglobosochonetes norquayensis
* †Sulcoretepora
* †Symphysurina
** †Symphysurina illaenoides
* †Syntrophopsis
** †Syntrophopsis polita – or unidentified comparable form
** †Syntrophopsis transversa
* †Syringopora
** †Syringopora surcularia
** †Syringopora surcularis

## 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
* †Tabantaloceras
* †Tabulipora
* †Taenicephalina
* †Taenicephalus
* †Tesselacauda
** †Tesselacauda depressa – type locality for species
* †Tetracamera
* Fossils of the Early-Late Ordovician graptolite Tetragraptus †Tetragraptus
** †Tetragraptus amii
** †Tetragraptus pseudobigsbyi
** †Tetragraptus quadribrachiatus
* †Tetralobula – tentative report
* †Tetraporinus
* †Tetrataxis
* †Thamnopora
* †Thoracocare
** †Thoracocare minuta
* †Timaniella
** †Timaniella pseudocamerata
* †Toernquistia – tentative report
* †Tonkinella
** †Tonkinella idahoensis – type locality for species
* †Torynifer
** †Torynifer cooperensis
** †Torynifer pseudolineata
* †Trigonocerca
** †Trigonocerca typica
* †Triticites
* †Tritoechia
* †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
** †Unispirifer minnewankensis
* †Urotheca
** †Urotheca sampsoni – type locality for species
* †Utia
** †Utia curio

## 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
* †Vanuxemella
** †Vanuxemella idahoensis – type locality for species
* †Vesiculophyllum
* †Vistoia – tentative report
** †Vistoia minuta
* †Vnigripecten
** †Vnigripecten phosphaticus

## 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
* †Werriea
** †Werriea australis
* †Wilbernia
* †Wilkingia
** †Wilkingia walkeri
* †Wilsonastraea
** †Wilsonastraea smithi
* †Wimanella
** †Wimanella maladensis – type locality for species
** †Wimanella nautes
** †Wimanella rara
** †Wimanella spencei
* †Worthenia – tentative report

## 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
* †Xenostegium
** †Xenostegium franklinense – type locality for species
** †Xenostegium taurus

## 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 geniculata – type locality for species
** †Yakovlevia multistriatus

## 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
** †Zacanthoides abbreviatus
** †Zacanthoides adjunctus
** †Zacanthoides gradatus
** †Zacanthoides holopygous
** †Zacanthoides holopygus
** †Zacanthoides idahoensis – type locality for species
** †Zacanthoides sampsoni – type locality for species
** †Zacanthoides serratus
* †Zaphrenthis – report made of unidentified related form or using admittedly obsolete nomenclature
** †Zaphrenthis compressus
* †Zaphrentites
** †Zaphrentites spinulosus
* †Zygospira
** †Zygospira circularis – or unidentified comparable form
** †Zygospira lebanonensis – or unidentified comparable form