List of the Paleozoic life of Utah

This list of the Paleozoic life of Utah contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Utah and are between 538.8 and 252.17 million years of age.

A

 * †Acanthopecten
 * †Acanthopecten carboniferus
 * †Acanthopecten coloradoensis
 * †Achlysopsis
 * †Achlysopsis liokata – or unidentified comparable form
 * †Achlysopsis punctatum
 * †Acidiphorus
 * †Acidiphorus brevis – or unidentified comparable form
 * †Acidiphorus brevus
 * †Acidiphorus brighti
 * †Acidiphorus pseudobathurus
 * †Acidiphorus unicorna – type locality for species
 * †Acidiphorus wahwahensis
 * †Acidiphorus williamsi – type locality for species
 * †Acinocricus
 * †Acinocricus stichus
 * †Acodus
 * †Acodus similaris
 * †Acontiodus
 * †Acontiodus coniformis
 * †Acrothele
 * †Acrothele subsidua
 * †Acrotreta
 * †Adiantites
 * †Adiantites tenuifolius
 * †Aesiocrinus
 * †Aesiocrinus secundus – type locality for species
 * Agnostus pisiformis Kinnekulle 1 CRF.jpg †[[Agnostus]]
 * †Agnostus neglectus
 * †Allorisma
 * †Allorynchus
 * †Alokistocare
 * †Alokistocare carnatum
 * †Alokistocare harrisi
 * †Alokistocare idahoense
 * †Alokistocare normale
 * †Alokistocare subcoronatum
 * †Alokistocarella
 * †Alokistocarella brighamensis
 * †Altiocculus
 * †Altiocculus concavus
 * †Altiocculus drumensis
 * †Amblycranium
 * †Amblycranium cornutum
 * †Amblycranium linearus – type locality for species
 * †Amblycranium variabile
 * †Amecephalus
 * †Amecephalus laticudum
 * †Ameura – tentative report
 * †Ammagnostus
 * †Ammagnostus beltensis
 * †Amphiscapha
 * †Amplexizaphrentis
 * †Amplexizaphrentis paucicinctus
 * †Amplexizaphrentis spinulosus
 * †Amplexizaphrentis subcrassus
 * †Amplexocarina
 * †Amplexus
 * †Anabarochilna
 * †Anabarochilna australis – or unidentified comparable form
 * †Ananias
 * †Ananias nevadensis – or unidentified related form
 * †Ancillotoechia
 * †Ancillotoechia perryi – type locality for species
 * †Anemonaria
 * †Anemonaria delicatula
 * †Angulotreta
 * †Angyomphalus
 * †Angyomphalus regularis
 * †Anidanthus
 * †Anidanthus echaris
 * †Anisopyge
 * †Anisotrypa
 * †Annularia
 * †Annularia stellata
 * †Annulispongia – type locality for genus
 * †Annulispongia interrupta – type locality for species
 * AnomalocarisDinoMcanb.jpg †[[Anomalocaris]]
 * †Anomalocaris nathorsti
 * †Anomalorthis
 * †Anomalorthis lambda
 * †Anomalorthis oklahomensis
 * †Anomalorthis utahensis
 * †Anomphalus
 * †Anomphalus rotulus
 * †Anthaspidella
 * †Anthracospirifer
 * †Anthracospirifer increbescens
 * †Anthracospirifer leidyi
 * †Anthracospirifer occiduus
 * †Antiquatonia
 * †Antiquatonia portlockianus
 * †Antiquatonia sulcatus – or unidentified comparable form
 * †Apachella
 * †Apatognathus
 * †Aphelaspis
 * †Aphelaspis haguei
 * †Aphelotoxon
 * †Aphelotoxon acuminata
 * †Apheoorthis
 * †Apheoorthis melita – or unidentified comparable form
 * †Apheorthis
 * †Apheorthis meeki – or unidentified comparable form
 * †Archaeocalamites
 * †Archaeocalamites scrobiculatus
 * †Archaeocothurnus – tentative report
 * †Archaeocothurnus bifida – type locality for species
 * †Archaeoscyphia
 * †Archaeoscyphia rossi
 * †Archeocalamites
 * †Archeocalamites radiatus
 * †Archeoschyphia
 * Fenestellidae - Archimedes species.JPG]] †Archimedes''
 * †Archimedes macfarlani
 * †Archimedes owenanus
 * †Arcuolimbus
 * †Arenicolites
 * †Arroyocrinus
 * †Arroyocrinus stokesi – type locality for species
 * †Arthrophycus – tentative report
 * †Artisia
 * †Asaphelina
 * †Asaphellus – tentative report
 * Asaphiscus wheeleri grey CRF.jpeg †[[Asaphiscus]]
 * †Asaphiscus wheeleri
 * †Ascopora
 * †Ascopora macellata
 * †Astartella
 * †Astartella subquadrata
 * †Asterophyllites
 * †Asterophyllites charaeformis
 * †Asterophyllites equisetiformis
 * †Asterophyllites longifolius
 * †Athabaskia
 * †Athabaskia bithus
 * †Athabaskia wasatchensis
 * †Athyridacid
 * †Athyris
 * †Athyris lamellosa
 * Atrypa reticularis pedunculate Gondelsheim CRF.jpg †[[Atrypa]]
 * †Atrypa hedei
 * †Atrypa parva – or unidentified comparable form
 * †Atrypid
 * †Aulacoparia – tentative report
 * †Aulacoparia quadrata
 * †Aulacoparia venta
 * †Aulacotheca
 * †Aulacotheca campbellii
 * †Aulacotheca hemingwayi
 * †Aulopora – tentative report
 * †Aviculopecten
 * †Aviculopecten girtyi
 * †Aviculopecten kaibabensis – or unidentified comparable form
 * †Aviculopinna
 * †Aviculopinna peracuta – tentative report
 * Aysheaia pedunculata.jpg †[[Aysheaia]]

B

 * †Babylonites
 * †Babylonites conoideus
 * †Bakevellia
 * †Baltagnostus
 * †Baltagnostus eurypyx
 * †Barrandia – tentative report
 * †Bathymyonia
 * †Bathymyonia nevadensis
 * †Bathyurellus
 * †Bathyurellus feitleri
 * †Bathyurellus pogonipensis
 * †Bathyurellus pogonopensis
 * †Bathyurellus teretus – type locality for species
 * †Bathyuriscus
 * †Bathyuriscus brighamensis
 * †Bathyuriscus elegans
 * †Bathyuriscus fimbriatus
 * †Bathyuriscus wasatchensis
 * †Bayfieldia
 * †Bearriverops
 * †Bearriverops alsacharovi – type locality for species
 * †Bearriverops borderinnensis – type locality for species
 * †Bearriverops deltaensis – type locality for species
 * †Bearriverops ibexensis – type locality for species
 * †Bearriverops loganensis
 * †Beckwithia
 * †Beckwithia typa
 * †Belemnospongia
 * †Belemnospongia neofascicularis – type locality for species
 * †Bellazona
 * †Bellazona bella
 * †Bellazona polita – type locality for species
 * †Bellefontia
 * †Bellefontia acuminiferentis
 * †Bellefontia chamberlaini
 * †Bellefontia ibexensis
 * †Benthamaspis
 * †Benthamaspis diminutiva
 * †Benthamaspis gibberula – type locality for species
 * †Benthamaspis obrepta
 * †Beyrichoceras
 * †Bighornia
 * †Billingsella
 * †Biscoia
 * †Blastoidocrinus
 * †Blastoidocrinus carchariaedens – or unidentified comparable form
 * †Blountia
 * †Bolaspidella
 * †Bolaspidella contracta
 * †Bolaspidella housensis
 * †Bolaspidella type locality for species – informal
 * †Bolaspidella wellsvillensis
 * †Bolbocephalus
 * †Bollandoceras
 * †Bollandoceras occidentale – type locality for species
 * †Bonneterrina
 * †Bourbonnella
 * †Bourbonnella jocelynae – type locality for species
 * †Bowmania
 * †Brachyaspidion
 * †Brachyaspidion microps
 * †Brachyaspidion sulcatum
 * †Brachyprion
 * †Brachyprion geniculata
 * †Brachythyris
 * Branchiocaris.jpg †[[Branchiocaris]]
 * †Branchiocaris pretiosa
 * †Brassicicephalus
 * †Breckwithia
 * †Breckwithia typa
 * †Brodioptera
 * †Brodioptera stricklani – type locality for species
 * †Bromella
 * †Brooksella
 * †Bucania
 * †Bythicheilus
 * †Bythicheilus typicum

C

 * †Cactocrinus
 * †Cactocrinus arnoldi
 * Calamites stems.JPG †[[Calamites]]
 * †Calamites cistii – or unidentified comparable form
 * †Calamites cistiiformis
 * †Calamites gigas
 * †Calamites hesperius
 * †Calamites infractus
 * †Calamites suckowii
 * †Calamostachys – tentative report
 * †Calathium
 * †Calathium yersini – type locality for species
 * †Callipteris – tentative report
 * †Callocladia
 * †Callocladia jensensis
 * †Calycocoelia
 * †Calygirtyoceras
 * †Calygirtyoceras arcticum
 * †Calygirtyoceras confusionense – type locality for species
 * †Camarotoechia
 * †Cambromedusa – type locality for genus
 * †Cambromedusa furcula – type locality for species
 * †Camerella
 * †Campbelloceras – tentative report
 * Canadaspis perfecta.JPG †[[Canadaspis]]
 * †Canadaspis perfecta – or unidentified comparable form
 * †Canadia
 * †Canadiphyllum
 * †Cancrinella
 * †Cancrinella phosphatica – or unidentified comparable form
 * †Caninaphyllum
 * †Caninaphyllum incrussatum
 * †Caninia
 * †Caninia torquia
 * †Caninophyllum
 * †Canthylotreta
 * †Canthylotreta marjumensis
 * †Cardiomorpha
 * †Cardiopteris
 * †Cardiopteris hirta – or unidentified comparable form
 * †Carolinites
 * †Carolinites ekphymosus
 * †Carolinites genacinaca – type locality for species
 * †Carolinites killarnyensis
 * †Carolinites killaryensis
 * †Castericystis
 * †Castericystis sprinklei – type locality for species
 * †Castericystis vali – type locality for species
 * †Catoraphiceras
 * †Catoraphiceras colon
 * †Caulpsis
 * †Caulpsis punctata
 * †Cavusgnathus
 * †Cavusgnathus regularis
 * †Cavusgnathus unicornis
 * Cedaria minor CRF.jpg †[[Cedaria]]
 * †Cedaria minor
 * †Cedarina – tentative report
 * †Cenorhynchia
 * †Cenorhynchia type locality for species A – informal
 * †Cernuolimbus
 * †Cernuolimbus granulosus
 * †Chaenomya
 * †Chaetetes
 * †Chaetetes milleporaceous
 * †Chancelloria
 * †Chancelloria eros
 * †Chancelloria pentacta – type locality for species
 * †Chancia)
 * †Chancia ebdome – or unidentified comparable form
 * †Chanciaopsis – type locality for genus
 * †Chanciaopsis heteromorphos – type locality for species
 * †Chanciopsis
 * †Chanciopsis heteromorphos
 * †Cheilocephalus
 * †Chilotrypa
 * Choia carteri reconstruction.JPG †[[Choia]]
 * †Choia carteri
 * †Choia hindei
 * †Choia ridleyi
 * †Choia utahensis
 * †Chondrites
 * †Chonetes
 * †Chonetina
 * †Chonetina flemingi
 * †Choristites
 * †Choristites fritschi – or unidentified comparable form
 * †Choristites pavlovi – or unidentified comparable form
 * Cladochonus coral KGS.jpg †[[Cladochonus]]
 * †Clathrospira – tentative report
 * †Clavagnostus
 * †Clavagnostus repandus
 * †Cleiothyridina
 * †Cleiothyridina type locality for species A – informal
 * †Cleiothyridina type locality for species B – informal
 * †Clelandia
 * †Clelandia utahensis
 * †Cliothyridina
 * †Cliothyridina orbicularis
 * †Clonograptus
 * †Coelogasteroceras
 * †Coenites
 * †Colinispongia
 * †Colinispongia regularis
 * Compositafossil.jpg †[[Composita]]
 * †Composita argentea
 * †Composita mira
 * †Composita ovata
 * †Composita parasulcata
 * †Composita plana
 * †Composita subtilita
 * †Composita trilobata
 * †Composita trinuclea
 * †Condrathyris
 * †Condrathyris perplexa
 * †Conotreta
 * †Conotreta millardensis
 * †Coosella
 * †Coosina
 * †Cordaianthus
 * †Cordaianthus pseudofluitans
 * †Cordaicarpus
 * †Cordaicarpus binutus – type locality for species
 * †Cordaicarpus cordatus
 * †Cordaicarpus elongatus
 * †Cordaicarpus globosus – type locality for species
 * †Cordaicarpus jayshulerii – type locality for species
 * †Cordaicarpus manningcanensis – type locality for species
 * Cordaites fossil cropped.png †[[Cordaites]]
 * †Cordaites angulosostriatus
 * †Cordaites principalis
 * †Cordaites Sp. A – informal
 * †Cordaites Sp. B – informal
 * †Cornucarpus
 * †Cornucarpus longicaudatus – type locality for species
 * †Corynepteris
 * †Corynepteris angustissima
 * †Costellarina
 * †Cotalagnostus
 * Crania
 * †Crania rowleyi
 * †Cravenoceras
 * †Crepicephalus
 * †Crossopteris – type locality for genus
 * †Crossopteris mcknightii – type locality for species
 * †Crossopteris undulata – type locality for species
 * †Crossopteris utahensis – type locality for species
 * †Crurithyris
 * †Crurithyris arcuatus – or unidentified comparable form
 * †Crurithyris expansa – tentative report
 * †Cruziana
 * †Ctenalosia
 * †Ctenalosia fixata
 * †Ctenocystis
 * †Ctenocystis utahensis
 * †Ctenospondylus
 * †Ctenospondylus casei – or unidentified related form
 * †Cyathaxonia
 * †Cyathocarpus
 * †Cyathocarpus arborescens
 * †Cyathocarpus cyatheus
 * †Cybeloides
 * †Cybelopsis
 * †Cybelopsis speciosa
 * Cyclopteris fossil cropped.png †[[Cyclopteris]]
 * †Cyclopteris dilatata
 * †Cymatospira
 * †Cymatospira montfortianus
 * †Cymbiocrinus
 * †Cymbiocrinus anatonus – type locality for species
 * †Cymbiocrinus cuneatus – type locality for species
 * †Cyperites
 * †Cyperites bicarinatus
 * †Cyrtia
 * †Cyrtina
 * †Cyrtorostra
 * †Cystodictya
 * †Cystodictya astrepta

D

 * †Dalmanellida
 * †Deiracephalus
 * †Delaria
 * †Delaria sevilloidia
 * †Delocrinus
 * †Delocrinus subhemisphericus
 * †Deltina – type locality for genus
 * †Deltina limba – type locality for species
 * Dentalium
 * †Derbyia
 * †Derbyia bennetti
 * †Derbyia crassa
 * †Derbyia sulca
 * †Derbyia wabashensis
 * †Desmoinesia
 * †Desmoinesia muricatina
 * †Diacanthaspis
 * †Diacanthaspis trispineus – type locality for species
 * Diadectes1DB.jpg †[[Diadectes]]
 * †Diagoniella
 * †Diagoniella cyathiformis
 * †Diagoniella hindei
 * †Diagoniella magna – type locality for species
 * †Diagoniella robisoni – type locality for species
 * †Diaphragmus
 * †Diaphragmus cestriensis
 * †Dicanthopyge
 * †Dicanthopyge convergens
 * †Dicranocaris
 * †Dicranocaris guntherorum
 * †Dictyoclostus
 * †Dictyoclostus burlingtonensis
 * †Dictyoclostus inflatus
 * †Dictyonema
 * †Dictyonema flabelliforme – or unidentified comparable form
 * Didymograptus murchisoni small.jpg †[[Didymograptus]]
 * †Didymograptus artus
 * †Didymograptus bifidus
 * †Didymograptus nitidus – or unidentified comparable form
 * †Dielasma
 * †Dielasma formosum
 * †Dielasma phosphoriense
 * †Dielasma spatulatum
 * †Dimegelasma
 * †Dimeropygiella
 * †Dimeropygiella blanda
 * †Dimeropygiella caudanodosa – type locality for species
 * †Dimeropygiella fillmorensis
 * †Dimeropygiella mccormicki
 * †Dimeropygiella ovata
 * †Dimorphoceras
 * †Dimorphoceras rileyi – type locality for species
 * †Dimorphoceras worki – type locality for species
 * †Dioxycaris
 * †Dioxycaris argenta
 * †Diparalasma
 * †Diparelasma
 * †Diparelasma pogonipensis – or unidentified comparable form
 * †Diparelasma rowelli
 * †Diparelasma transversum – or unidentified comparable form
 * †Diphyphyllum
 * †Diplagnostus
 * †Diplagnostus planicauda
 * †Diplorrhina
 * †Diplorrhina depressa
 * †Diplothmema
 * †Diplothmema arnoldi
 * †Diplothmema obtusiloba
 * †Diplothmema trifoliolata
 * †Diplotrypa – tentative report
 * †Ditomopyge
 * †Dolerorthis – tentative report
 * †Dolerorthis flabellites
 * †Donaldina
 * †Dorypyge
 * †Dorypyge swasii
 * †Dorypyge wellsvillensis
 * †Drepanodus
 * †Drepanodus homocurvatus
 * †Dresbachia
 * †Dresbachia amata
 * †Duartea
 * †Duartea bruntoni
 * †Dunbarinella – tentative report
 * †Dunderbergia
 * †Dunderbergia anyta
 * †Dunderbergia bigranulosa – tentative report
 * †Dyoros
 * †Dyoros type locality for species A – informal
 * †Dysoristus
 * †Dytremacephalus
 * †Dzhaprakoceras

E

 * †Echinalosia
 * †Echinalosia type locality for species A – informal
 * †Echinaria
 * †Echinaria semipunctata – or unidentified related form
 * †Echinauris – or unidentified comparable form
 * †Echinauris subhorrida
 * †Echinoconchus
 * †Echinoconchus elegans
 * †Echinoconchus semipunctatus
 * †Echinocrinus
 * †Ectenonotus
 * †Ectenonotus progenitor
 * †Ectenonotus whittingtoni
 * Ectosteorhachis.JPG †[[Ectosteorhachis]] – or unidentified related form
 * †Ectosteorhachis nitidus
 * †Edmondia
 * †Ehmaniella
 * †Ehmaniella quadrans – tentative report
 * †Ekvasophyllum
 * †Ekvasophyllum inclinatum
 * †Elburgia
 * †Elburgia granulosa
 * †Elburgia intermedia
 * †Eldonia
 * †Eldonia ludwigi
 * †Eleutherocentrus
 * †Eleutherocentrus petersoni
 * †Elrathella
 * Elrathia kingii growth series.jpg †[[Elrathia]]
 * †Elrathia kingi
 * †Elrathiella
 * †Elrathiella dugwayensa – type locality for species
 * †Elrathina
 * †Elrathina spencei
 * †Elvinia
 * †Emeraldella
 * †Endelocrinus
 * †Endelocrinus matheri
 * †Endoceras
 * †Entogonites
 * †Entogonites acus
 * †Entogonites borealis
 * †Entogonites burbankensis – type locality for species
 * †Eoastarte
 * †Eoastarte subcircularis
 * †Eofletcheria
 * †Eoorthis
 * †Eriaster – type locality for genus
 * †Eriaster ibexensis – type locality for species
 * †Eridopora
 * †Eridotrypa
 * †Eridotrypa hindsi
 * †Eridotrypa subtilis
 * †Erixanium
 * †Erixanium carinatum
 * Eryops1DB.jpg †[[Eryops]]
 * †Euconospira
 * †Eukrinaster – type locality for genus
 * †Eukrinaster ibexensis – type locality for species
 * †Eukteanochiton – type locality for genus
 * †Eukteanochiton milleri – type locality for species
 * †Euloma – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Euloma cordilleri
 * †Eumetria
 * †Eumetria acuticosta
 * †Eumetria costata
 * †Euphemites
 * †Euphemites carbonarius
 * †Euphemitopsis
 * †Euphemitopsis subpapillosa – type locality for species
 * †Euptychaspis
 * †Eurekia
 * †Eurytreta
 * †Eurytreta bisecta – or unidentified comparable form
 * †Eurytreta fillmorensis – type locality for species

F

 * †Faberophyllum
 * †Falcatamacaris – type locality for genus
 * †Falcatamacaris bellua – type locality for species
 * †Fenestella
 * †Fenestella acarinata
 * †Fenestella crockfordae
 * †Fenestella dissepinodaria
 * †Fenestella hamithensis
 * †Fenestella incipiens
 * †Fenestella parallela
 * †Fenestella rarinodosa
 * †Fenestella regalis
 * †Fenestella serratula
 * †Fenestella tooelensis
 * †Fenestella trifurcata
 * †Fenestella utahensis
 * †Fenestralia
 * †Fenestralia sanctiludovici
 * †Fenestrellina
 * †Fistulipora
 * †Forteyops
 * †Forteyops sexapugia – type locality for species
 * †Fusulinella

G

 * †Gattendorfia
 * †Genalaticurus
 * †Genalaticurus genalatus
 * Genevievella granulosa CRF.jpg †[[Genevievella]]
 * †Genevievella granulatus
 * †Girtyella – tentative report
 * †Girtyoceras
 * †Girtyoceras gordoni – type locality for species
 * †Girtyoceras hamiltonense
 * †Girtyoceras primum – type locality for species
 * †Girtypecten
 * †Girtyspira
 * †Girvanella
 * †Glabrocingulum
 * †Glabrocingulum coronatum
 * †Glabrocingulum granulosum – type locality for species
 * †Glabrocingulum mephitifontis – type locality for species
 * †Glaphyrites
 * †Glaphyrites nevadensis
 * †Globocrinus
 * †Globocrinus bulbus – type locality for species
 * †Glochinomorpha – type locality for genus
 * †Glochinomorpha stifeli – type locality for species
 * †Glosopleura
 * †Glossopleura
 * †Glossopleura boccar
 * †Glossopleura gigantea
 * †Glossopleura producta
 * †Glossopleura prona
 * †Glossopleura punctatum
 * †Glyphaspis
 * †Glyphaspis concavus – type locality for species
 * †Glyptospira
 * †Gnathodus
 * †Gnathodus texanus
 * †Gnetopsis
 * †Gnetopsis anglica
 * Gogia kitchnerensis 01.jpg †[[Gogia]]
 * †Gogia granulosa
 * †Gogia guntheri
 * †Gogia kitchnerensis
 * †Gogia spiralis
 * †Goleocrinus
 * †Goleocrinus vadosus – type locality for species
 * †Goleocrinus vedosus
 * †Goniasma
 * †Goniatites
 * †Goniatites americanus
 * †Goniatites deceptus – type locality for species
 * †Goniatites eganensis
 * †Goniatites sowerbyi
 * †Goniophrys
 * †Goniophrys prima
 * †Goniotelena
 * †Goniotelena ensifer
 * †Goniotelina
 * †Goniotelina ensifer
 * †Goniotelina plicolabeonus – type locality for species
 * †Goniotelus – tentative report
 * †Goniotelus ludificatus
 * †Gonitelina
 * †Gothodus
 * †Gothodus communis
 * †Grammatodon
 * †Grammatodon politus
 * †Grandaurispina – or unidentified comparable form
 * †Grandaurispina type locality for species A – informal
 * †Gruntia – tentative report
 * †Guizhoupecten – tentative report
 * †Guizhoupecten tubicostata – or unidentified comparable form
 * †Gujocardita
 * †Gujocardita parviradiatus – type locality for species
 * †Gunterichthys – type locality for genus
 * †Gunterichthys lehiensis – type locality for species

H
†Hyolithes
 * †Haimacystis
 * †Haimacystis rozhnovi
 * †Hammatocyclus
 * †Hammatocyclus brazerensis – type locality for species
 * †Hamptonia
 * †Hamptonia bowerbanki
 * †Hamptonia parva – type locality for species
 * †Haplistion
 * †Haplistion sphaericum
 * Haplophrentis.jpg †[[Haplophrentis]]
 * †Haplophrentis carinatus
 * †Haplophrentis reesei
 * †Hardyoides
 * †Hazelia
 * †Hazelia palmata
 * †Heckethornia
 * †Heckethornia alticapitis – type locality for species
 * †Heckethornia ballionae – type locality for species
 * †Heckethornia bowiei – type locality for species
 * †Heckethornia hyndeae
 * †Heckethornia morrisseyi – type locality for species
 * †Heckethornia numani
 * †Heckethornia smithi – type locality for species
 * †Heintzella
 * †Heintzella whitneyi
 * Helicoprion bessonovi cropped.png †[[Helicoprion]]
 * †Helicospira
 * †Hematites
 * †Hematites barbarae – type locality for species
 * †Hematites burbankensis – type locality for species
 * †Hemiptychina
 * †Hemiptychina quadricostata
 * †Hemirhodon
 * †Hemirhodon amplipyge
 * †Hemitrypa
 * †Hemitrypa reticulata
 * †Hesperonomia
 * †Hesperonomia dinorthoides
 * †Hesperonomia fontinalis
 * †Hesperonomia frontinalis
 * †Hesperonomiella
 * †Hesperonomiella minor
 * †Heteralosia
 * †Heteropecten
 * †Heteropecten vanvleeti – or unidentified comparable form
 * †Hillyardina
 * †Hillyardina marginauctum
 * †Hillyardina semicylindrica – or unidentified comparable form
 * †Hindia
 * †Hindia sphaeroidalus
 * †Hintzecurus
 * †Hintzecurus paragenalatus
 * †Hintzeia
 * †Hintzeia aemula
 * †Hintzeia celsaora
 * †Hintzeia firmimarginis
 * †Hintzespongia – type locality for genus
 * †Hintzespongia bilamina – type locality for species
 * †Holcospermum
 * †Homagnostus
 * †Homalophyllites
 * †Hormotoma – tentative report
 * †Housia
 * †Howellella
 * †Hudsonospongia – tentative report
 * †Huronia
 * †Huronia vertebralis
 * †Hustedia
 * †Hustedia elongata
 * †Hustedia mormoni – type locality for species
 * †Hyattidina – tentative report
 * †Hyolithellus
 * †Hyolithes comptus
 * †Hypagnostus
 * †Hypagnostus parvifrons
 * Hyperammina
 * †Hyperbolochilus
 * †Hypselocrinus
 * †Hypselocrinus cavus – type locality for species
 * †Hypselocrinus defendus – type locality for species
 * †Hypselocrinus secundus
 * †Hypselocrinus superus – type locality for species
 * †Hystriculina
 * †Hystriculina fragilis
 * †Hystriculina wabashensis
 * †Hystricurus
 * †Hystricurus contractus
 * †Hystricurus oculilunatus
 * †Hystricurus robusta

I

 * †Ianthinopsis
 * †Ibexella
 * †Ibexella multidiaphragmata
 * †Ibexicurus
 * †Ibexicurus parsonsi – type locality for species
 * †Iddingsia
 * †Idiognathodus
 * †Idiomesus
 * †Illaenurus
 * Illaenidae - Illaenus tauricornis.JPG †[[Illaenus]]
 * †Illaenus utahensis
 * †Inflatia
 * †Inflatia bilobata
 * †Iphidella
 * †Irvingella
 * †Irvingella flohri – tentative report
 * †Irvingella major
 * †Ischyrotoma
 * †Ischyrotoma juabensis
 * †Ischyrotoma wahwahensis
 * †Isorthis
 * †Isoteloides
 * †Isoteloides flexus
 * †Isoteloides polaris
 * †Isoxyes

J

 * †Jeffersonia
 * †Jenkinsonia
 * †Jenkinsonia varga
 * †Juresania
 * †Juresania nebraskensis

K

 * †Kainella
 * †Kanoshia
 * †Kanoshia depressus – type locality for species
 * †Kanoshia kanoshensis
 * †Kanoshia reticulata
 * †Kanoshopora
 * †Kanoshopora droserae
 * †Kawina
 * †Kawina webbi
 * †Kawina wilsoni
 * †Kazakhoceras
 * †Kazakhoceras bylundi – type locality for species
 * †Kindbladia
 * †Kindbladia affinis
 * †Kingstonia
 * †Kirkella
 * †Kirkella fillmorensis
 * †Kiwetinokia
 * †Kiwetinokia utahensis
 * †Kochina
 * †Kochina vestita
 * †Kochiproductus
 * †Komia
 * †Komiella
 * †Komiella ostiolata
 * Kootenia fossil cropped.png †[[Kootenia]]
 * †Kootenia acicularis
 * †Kootenia mendosa
 * †Kootenia quadriceps
 * †Kootenia spencei
 * †Kootina
 * †Kootina pectenoides
 * †Kormagnostella
 * †Kormagnostella advena
 * †Kormagnostella insolita
 * †Kormagnostus
 * †Kozlowskia
 * †Kozlowskia capaci – or unidentified related form
 * †Kutorginella
 * †Kutorginella lasallensis
 * †Kuvelousia
 * †Kuvelousia leptosa

L

 * †Lachnostoma
 * †Lachnostoma latucelsum – type locality for species
 * †Lagenospermum
 * †Lagenospermum discissium – type locality for species
 * †Lamellispira
 * †Lavadamia
 * †Lavadamia joplinae – type locality for species
 * †Leanchoila
 * †Leanchoila protogonia
 * †Leanchoila superlata
 * Leanchoilia superlata study cropped.png †[[Leanchoilia]]
 * †Leanchoilia hanceyi
 * †Leanchoilia superlata
 * †Lecanospira
 * †Leiorhynchoidea
 * †Leiorhynchus
 * †Leiostegium
 * †Leiostegium formosa
 * †Leiostegium manitouense – or unidentified comparable form
 * †Leiostegium manitouensis
 * †Lejopyge
 * †Lejopyge calva
 * †Leperditia
 * †Leperditia bivia
 * †Lepidocarpon
 * †Lepidocarpon linearifolium
 * Lepidodendron.png †[[Lepidodendron]]
 * †Lepidodendron aculeatum
 * †Lepidodendron obovatum
 * †Lepidodendron volkmannianum
 * †Lepidophylloides
 * †Lepidophyllum
 * †Lepidophyllum longifolium
 * †Lepidostrobophyllum
 * †Lepidostrobophyllum majus
 * †Lepidostrobus
 * †Lepidostrobus obovatus
 * †Lepidostrobus variabilis
 * †Leptaena
 * †Leptalosia
 * †Leptalosia scintilla – or unidentified comparable form
 * †Leptanena
 * †Leptomitella
 * †Leptomitella metta – type locality for species
 * †Leptomitus
 * †Lesuerilla – tentative report
 * †Licnocephala
 * †Licnocephala bicornuta – tentative report
 * †Licnocephala cavigladius
 * Lima
 * †Limapecten
 * Limatula
 * †Limipecten
 * †Linevitus
 * †Linevitus billingsi
 * Lingula
 * †Lingula carbonaria
 * Lingulella caelata 1.png †[[Lingulella]]
 * †Lingulella incurvata
 * †Lingulella pogonipensis – or unidentified comparable form
 * †Linipalus
 * †Linipalus magnispinus
 * †Linnarssonella
 * †Linnarssonia
 * †Linnarssonia bellatula
 * †Linnarssonia ophirensis
 * †Linoproductus
 * †Linoproductus meniscus
 * †Linoproductus ovatus
 * †Linoproductus planiventralis – tentative report
 * †Linoproductus prattenians
 * †Linoproductus prattenianus
 * †Lissocoelia
 * †Lissocoelia cylindrica
 * †Lithostrontionella
 * †Lithostrotionella
 * †Lithostrotionella americana – or unidentified comparable form
 * †Llanoaspis
 * †Lobatospongia – type locality for genus
 * †Lobatospongia nodensis – type locality for species
 * †Lochriea
 * †Lochriea commutata
 * †Lonchocephalus
 * †Lophophyllidium
 * †Lophophyllidium profundum
 * †Loxonema
 * †Loxoplocus
 * †Lunulazona
 * †Lunulazona costata
 * †Lunulazona nodomarginata
 * †Lyracystis
 * †Lyracystis reesei

M

 * †Macluritella
 * †Maclurites
 * †Macronotella
 * †Madaraspis
 * †Madaraspis magnifica
 * Margaretia dorus Reconstruction.png †[[Margaretia]]
 * †Margaretia dorus
 * †Marginifera
 * †Marginovatia
 * †Marginovatia catinulus
 * †Mariopteris
 * †Mariopteris muricata
 * †Marjumicystis
 * †Marjumicystis mettae – type locality for species
 * †Marpolia
 * †Matherella
 * †Matthevia
 * †Matthevia variabilis
 * †Matthevia wahwahensis – type locality for species
 * †Meekopora
 * †Meekospira
 * †Menomonia
 * †Menomonia semele
 * †Menoparia
 * †Menoparia genalunata
 * †Metabowmania
 * †Metabowmania braggi – type locality for species
 * †Metabowmania morgani
 * Metacoceras discoideum 01.jpg †[[Metacoceras]]
 * †Metadimorphoceras
 * †Metadimorphoceras mangeri – type locality for species
 * †Metadimorphoceras richardsi
 * †Meteoaspis – tentative report
 * †Meteoraspis
 * †Michelinia
 * †Microcardinalia
 * †Micromitra
 * †Micromitra pannula
 * †Millardicurus
 * †Millardicurus housensis – type locality for species
 * †Millardicurus millardensis
 * †Millardicurus paramillardensis – type locality for species
 * †Modiolopsis
 * Modiolus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Modocia
 * †Modocia brevispina
 * †Modocia laevinucha
 * †Modocia typicalis
 * †Modocia weeksensis – type locality for species
 * †Mollisonia
 * †Mollisonia symmetrica
 * †Morania
 * †Morania fragmenta
 * †Mourlonia
 * †Mourlonia venusta – type locality for species
 * †Myalina

N

 * †Nanorthis
 * †Nanorthis hamburgensis
 * †Nanorthis multicostata
 * Naraoia spinosa.jpg †[[Naraoia]]
 * †Naraoia compacta
 * †Narynella
 * †Narynella sulcata
 * †Naticopis
 * †Naticopis altonensis – tentative report
 * †Naticopsis
 * †Natiria
 * †Neochonetes
 * †Neochonetes granulifer
 * †Neolenus
 * †Neolenus inflatus – type locality for species
 * †Neolenus intermedius – type locality for species
 * †Neolenus superbus
 * †Neoprioniodus
 * †Neoprioniodus scitulus
 * †Neoprioniodus varians
 * Trigonotretidae - Neospirifer ravana.JPG †[[Neospirifer]]
 * †Neospirifer cameratus
 * †Neospirifer kansasensis
 * †Neospirifer triplicatus
 * †Neozaphrentis – tentative report
 * †Nephalicephalus – type locality for genus
 * †Nephalicephalus beebei – type locality for species
 * †Nettapezoura
 * †Nettapezoura basilika
 * †Neuralethopteris
 * †Neuralethopteris pocahontas – or unidentified comparable form
 * Neuropteris PAMuseum.jpg †[[Neuropteris]]
 * †Neuropteris ampelina – type locality for species
 * †Neuropteris gigantea
 * †Neuropteris heterophylla
 * †Nieszkowskia – tentative report
 * †Niobe – tentative report
 * †Nisusia
 * †Norwoodia
 * †Norwoodia bellaspina
 * †Nothorthis
 * †Nuculavus
 * †Nuculopsis
 * †Nuia
 * †Nunnacrinus
 * †Nunnacrinus olsoni – type locality for species

O

 * †Obolus
 * †Obolus ella
 * †Odontopteris
 * †Odontopteris osmundaeformis – or unidentified comparable form
 * †Odontopteris subcrenulata – or unidentified comparable form
 * †Odontospirifer
 * †Odontospirifer type locality for species A – informal
 * †Oepikodus
 * †Oepikodus quadratus
 * Ogygopsis Klotzi cropped.jpg †[[Ogygopsis]]
 * †Ogygopsis typicalis
 * †Oistodus
 * †Oistodus lanceolatus
 * †Oistodus linguatus
 * †Oistodus longiramis
 * †Oistodus multicorrugatus – or unidentified related form
 * †Oistodus parallelus
 * †Olenellus
 * †Olenellus gilberti
 * †Olenoides
 * †Olenoides expansus
 * †Olenoides nevadensis
 * †Olenoides serratus
 * †Olenoides spencei
 * †Olenoides tricephalus
 * Ophiacodon mirus cropped.png †[[Ophiacodon]]
 * †Ophiacodon navajovicus
 * †Ophileta
 * †Opsioryctocephalus
 * †Opsioryctocephalus opsis
 * †Orbiculoidea
 * †Orbiculoidea capuliformis
 * †Orbiculoidea missouriensis
 * †Orbiculoidea utahensis – type locality for species
 * †Orbipora
 * †Orbipora utahensis
 * †Orthambonites
 * †Orthambonites eucharis – or unidentified comparable form
 * †Orthambonites michaelis
 * †Orthambonites subulata
 * †Orthis
 * †Orthis subalata – or unidentified comparable form
 * †Orthis subulata
 * †Orthis swanensis
 * †Orthonema
 * †Orthonema socorroense – or unidentified comparable form
 * †Orthotetes
 * †Orthotetes kaskaskiensis
 * †Orthriochiton – type locality for genus
 * †Orthriochiton utahensis – type locality for species
 * †Oryctocare
 * †Oryctocare geikei
 * †Oryctocephalus
 * †Oryctocephalus walcotti
 * †Ottenbyella
 * †Ottenbyella ibexiana – type locality for species
 * Ottoia burrowing cropped.png †[[Ottoia]]
 * †Ottoia prolifica
 * †Ovatia
 * †Ovatia muralis
 * †Owenella
 * †Ozarkodina

P

 * †Pachycranium
 * †Pachycranium faciclunis
 * Pagetia taijiangensis 2.jpg †[[Pagetia]]
 * †Pagetia fossula – or unidentified comparable form
 * †Paladin
 * †Palaeacis
 * Palaeoaplysina
 * †Palaeoaplysina laminaeformis
 * †Palaeobotryllus
 * †Palaeoneilo
 * †Palaeoneilo parvaradiatus
 * †Palaeoscolex
 * †Palaeoscolex ratcliffei
 * †Paleococrinus
 * †Palmerocrinus
 * †Palmerocrinus profundus
 * †Paltodus
 * †Paltodus jeffersonensis
 * †Parabellefontia
 * †Parabellefontia concinna
 * †Parabolinoides
 * †Paracosmetocrinus
 * †Paracosmetocrinus lundi – type locality for species
 * †Parahystricurus
 * †Parahystricurus bispicatus
 * †Parahystricurus fraudator
 * †Parajuresania
 * †Parajuresania nebrascensis
 * †Parallelodon
 * †Parapilekia – tentative report
 * †Paraplethopeltis
 * †Paraplethopeltis genacurvus
 * †Paraplethopeltis genarectus
 * †Parkaspis
 * †Parkaspis drumensis
 * †Peelerophon – tentative report
 * †Pelagiella
 * †Peniculauris
 * †Peniculauris bassi
 * †Peniculauris ivesi
 * †Penniretepora
 * †Pentameroides
 * †Pentamerus
 * †Pericyclus
 * †Permophorus
 * †Permophorus albequus
 * †Permophorus occidentalis
 * [[File:Itagnostus interstrictus - Wheeler Schale, Utah, USA - Cambrian period (≈ -507 MA) - 39.25°N 113.33°W .jpg|thumb|upright=0.767|Assemblage of fossils of the Cambrian trilobite [[Itagnostus|Itagnostus interstrictus]], until recently known as Peronopsis interstricta]] †Peronopsis
 * †Peronopsis acadica
 * †Peronopsis amplaxis
 * †Peronopsis bonnerensis
 * †Peronopsis brighamensis
 * †Peronopsis fallax
 * †Peronopsis interstricata
 * †Peronopsis interstricta
 * †Peronopsis montis
 * †Peronopsis scutalis
 * †Peronopsis segmenta
 * †Peronopsis sermenta
 * †Perspicaris
 * †Perspicaris ellipsopelta
 * †Petasmatherus
 * †Petasmatherus type locality for species A – informal
 * †Petigurus
 * †Petigurus inexpectatus
 * †Pharkidonotus
 * †Pharkidonotus percarinatus
 * †Phillipsia
 * †Phosphannulus
 * †Phrenophoria
 * †Phrenophoria type locality for species A – informal
 * †Phricodothyris
 * †Phyllograptus
 * †Pilekia
 * †Pilekia trio – tentative report
 * Pinna – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Plagioglypta
 * †Platycrinites
 * †Platycrinus
 * †Platycrinus graphicus – or unidentified comparable form
 * Platyhystrix BW.jpg †[[Platyhystrix]] – or unidentified comparable form
 * †Platyhystrix rugosus
 * †Platyworthenia
 * †Plectelasma
 * †Plectelasma type locality for species A – informal
 * †Plectelasma type locality for species B – informal
 * †Plethospira
 * †Pleurosiphonella
 * †Pleurosiphonella virginica
 * †Pliomerops
 * †Pliomerops insolita
 * †Polidevcia
 * †Polidevcia bellistriata
 * †Polidevcia obesa
 * †Politicurus
 * †Politicurus politus
 * †Polypora
 * †Polypora cestriensis
 * †Polypora debilis
 * †Polypora micronodosa
 * †Polypora stansburyensis
 * †Ponticulocarpus – type locality for genus
 * †Ponticulocarpus robisoni – type locality for species
 * †Praedaraelites
 * †Praedaraelites loeblichi
 * †Prehousia
 * †Prehousia alata
 * †Prehousia diverta
 * †Presbynileus
 * †Presbynileus elongatus
 * †Presbynileus ibexensis
 * †Presbynileus utahensis
 * †Probolionia
 * †Prodentalium
 * †Prodentalium canna
 * †Productella
 * †Productus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Proehmaniella
 * †Proehmaniella basilica
 * †Prohedinia
 * †Prohedinia spencei
 * †Prolecanites – tentative report
 * †Prolecanites lyoni
 * †Prosaukia
 * †Protoblechnum
 * †Protoblechnum bradyi – type locality for species
 * †Protopliomerella
 * †Protopliomerella contracta
 * †Protopliomerops
 * †Protopliomerops quattuor – type locality for species
 * †Protopresbynileus
 * †Protopresbynileus willdeni
 * †Protoretepora
 * †Protospongia
 * †Protospongia elongata
 * †Prototreta
 * †Protowentzelella
 * †Protowentzelella cystosa
 * †Psalikilus
 * †Psalikilus likum
 * †Psalikilus paraspinosum
 * †Psalikilus spinosum
 * †Psalikilus typicum
 * †Psephosthenaspis
 * †Psephosthenaspis glabrior
 * †Psephosthenaspis microspinosa
 * †Psephosthenaspis pseudobathyurus
 * †Pseudagnostus
 * †Pseudoarctolepis
 * †Pseudoarctolepis sharpi
 * †Pseudoarctolepsis
 * †Pseudoarctolepsis sharpi
 * †Pseudoclelandia
 * †Pseudoclelandia fluxafissura – or unidentified related form
 * †Pseudocybele
 * †Pseudocybele altinasuta
 * †Pseudocybele lemurei
 * †Pseudocybele nasuta – type locality for species
 * †Pseudodoriodotis
 * †Pseudohystricurus
 * †Pseudokainella – tentative report
 * †Pseudokainella armatus
 * †Pseudomera
 * †Pseudomera arachnopyge
 * †Pseudomera barrandei – or unidentified comparable form
 * †Pseudomera insolita
 * †Pseudomonotis
 * †Pseudomonotis equistriata
 * †Pseudomphalotrochus
 * †Pseudomphalotrochus incrustatus
 * †Pseudoolenoides
 * †Pseudoolenoides acicaudus
 * †Pseudoolenoides aspinosus
 * †Pseudoolenoides dilectus
 * †Pseudopermophorus
 * †Pseudopermophorus annettae
 * †Pseudoperonopsis
 * †Pseudorthoceras
 * †Pseudosaratogia – tentative report
 * †Pseudoschwagerina
 * †Pterocephalia
 * †Pteronites
 * †Ptychagnostus
 * †Ptychagnostus aculeatus
 * Ptychagnostus Atavus.jpg †[[Ptychagnostus atavus]]
 * †Ptychagnostus cassis
 * †Ptychagnostus germanus
 * †Ptychagnostus intermedius
 * †Ptychagnostus occultatus
 * †Ptychagnostus punctuosus
 * †Ptychagnostus richmondensis
 * †Ptychagnostus seminula
 * †Ptychomphalus
 * †Ptychoparella
 * †Ptylopora
 * †Ptylopora condrai
 * †Ptylopora eliasi
 * †Ptyocephalus
 * †Ptyocephalus accliva
 * †Ptyocephalus declevita – type locality for species
 * †Ptyocephalus declivita
 * †Ptyocephalus versini
 * †Ptyocephalus vigilans
 * †Pugnax
 * †Pugnax utah – type locality for species
 * †Pugnoides
 * †Punctospirifer
 * †Punctospirifer campestris
 * †Punctospirifer kentuckensis
 * †Punka
 * †Punka nitida – or unidentified comparable form

Q

 * †Quadratia
 * †Quadrisonia – tentative report
 * †Quadrisonia lavadamensis
 * †Quadrochonetes
 * †Quadrochonetes type locality for species A – informal

R

 * †Ramiporalia
 * †Raphistoma – tentative report
 * †Raphistomina
 * †Ratcliffespongia – type locality for genus
 * †Ratcliffespongia perforata – type locality for species
 * †Ratcliffespongia sheeleri
 * †Ratcliffespongia wheeleri – type locality for species
 * †Rayonnoceras
 * †Rayonnoceras solidiorme
 * KimmswickOzoraMidOrdReceptaculitid.jpg †[[Receptaculites]]
 * †Receptaculites elongatus
 * †Receptaculites mammilaris
 * †Receptaculites mammillaris
 * †Rectifenestella
 * †Rectifenestella tenax
 * †Regispongia
 * †Regispongia contorta
 * †Remopleuridiella
 * †Remopleuridiella angularis – type locality for species
 * †Remopleuridiella caudalimbata
 * †Reticulatia
 * †Reticulatia americana
 * †Retispira
 * †Retispira cincta – type locality for species
 * †Retispira textilis – or unidentified comparable form
 * †Rhabdomeson
 * †Rhabdomeson artum
 * †Rhipidomella
 * †Rhipidomella missouriensis
 * [[File:Naturalis Biodiversity Center - ZMA.MOLL.32565 - Rhodea maxima Mousson - Subulinidae - Mollusc shell cropped.jpg|thumb|upright|Shell of a Rhodea land snail]] †[[Rhodea]]
 * †Rhodea vespertina
 * †Rhombopora
 * †Rhombopora tenuirama
 * †Rhynchopora
 * †Ribeiria
 * †Ribeiria lucan
 * †Rigbyocarpus – type locality for genus
 * †Rigbyocarpus ebracteatus – type locality for species
 * †Rodea
 * †Rodea vespertina – or unidentified comparable form
 * †Rossaspis
 * †Rossaspis superciliosa
 * †Rossicurus
 * †Rossicurus lepidus
 * †Rugatia
 * †Rugatia occidentalis
 * †Rugosochonetes
 * †Rugosochonetes loganensis
 * RusophycusOrdovician.jpg †[[Rusophycus]]
 * †Rylstonia – tentative report

S

 * †Saffordotaxis
 * †Sanguinolites
 * †Sanguinolites elongatus – type locality for species
 * †Saukia
 * Saukiidae - Saukiella pepinensis.JPG †[[Saukiella]]
 * †Scandodus
 * †Scandodus furnishi
 * †Scaphellina – tentative report
 * †Scenella
 * †Scenella radians
 * †Schizambon
 * †Schizambon obtusus – type locality for species
 * †Schizodus
 * †Schizodus bifidus
 * †Schizodus subovatus – type locality for species
 * †Schizophoria
 * †Schmalenseeia
 * †Schuchertella
 * †Schuchertella lens
 * †Schwagerina
 * †Scolicia
 * †Scolopodus
 * †Scolopodus gracilis
 * †Scolopodus pseudoquadratus
 * †Scolopodus quadraplicatus
 * †Scolopodus rex
 * †Seelyia
 * †Selenocoryphe – type locality for genus
 * †Selenocoryphe platyura – type locality for species
 * Selkirkia columbia ROM63131.jpg †[[Selkirkia]]
 * †Selkirkia columbia – or unidentified comparable form
 * †Selkirkia spencei
 * †Selkirkia willoughby
 * †Sentinelia – tentative report
 * †Sentinelia draco – or unidentified comparable form
 * †Septimyalina
 * †Septimyalina burmai – tentative report
 * †Septopora
 * †Septopora ulrichi
 * †Shoshonorthis
 * †Shoshonorthis michaelis
 * †Shoshonorthis swanensis
 * †Shumardia
 * †Shumardia exopthalmus
 * Sidneyia1.JPG †[[Sidneyia]]
 * †Sigillaria
 * †Sigillaria brardii
 * †Sinuella – tentative report
 * †Siphonobolus – tentative report
 * †Spathognathus
 * †Spathognathus cristulus
 * †Spathognathus scitulus
 * †Spencella
 * †Spencella utahensa – type locality for species
 * †Spencella utahensis
 * Sphenacodon2.jpg [[Sphenacodon]]
 * †Sphenacodon ferocior – or unidentified comparable form
 * †Sphenophyllostachys – tentative report
 * †Sphenophyllum
 * †Sphenophyllum angustifolium
 * †Sphenophyllum verticillatum
 * †Sphenopteridium
 * †Sphenopteridium dissectum
 * †Sphenopteridium zaitzeffii – type locality for species
 * †Sphenopteris
 * †Sphenopteris diphlebia – type locality for species
 * †Sphenosteges
 * †Sphenosteges hispidus
 * †Spinilingula
 * †Spinilingula prisca – type locality for species
 * †Spinofacia – type locality for genus
 * †Spinofacia pectinatus – type locality for species
 * Spirifer perlamosus pedunculate valve.jpg †[[Spirifer]]
 * †Spirifer centronatus
 * †Spirifer opimus
 * †Spirifer rockymountanus
 * †Spiriferina
 * †Spirinella
 * †Spirinella pauciplicata
 * Spirorbis
 * †Squamaria
 * †Squamularia – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Stenolobulites
 * †Stenolobulites simulator
 * †Stenolobulites sinuosus
 * †Stenopora
 * †Stenopora confusionensis
 * †Stenoporella
 * †Stenoporella mineriensis
 * †Stenorhachis – tentative report
 * †Stenorhachis genalticurvatus
 * †Stibaraster – type locality for genus
 * †Stibaraster ratcliffei – type locality for species
 * Lycopsid joggins mcr1.JPG †[[Stigmaria]]
 * †Stigmaria ficoides
 * †Stigmariopsis
 * †Stigmariopsis anglica
 * †Stolodus – or unidentified related form
 * †Stolodus stola
 * †Straparollus
 * †Streblochondria
 * †Strebloplax
 * †Strebloplax pertusa
 * †Streblopteria
 * †Streblopteria montpelierensis
 * †Streblotrypa
 * †Streblotrypa angulatum
 * †Streptelasma
 * †Striatifera
 * †Striatifera brazeriana
 * †Strigambitus
 * †Strigambitus utahensis
 * †Strobeus – or unidentified related form
 * †Sulcoretepora
 * †Supaia
 * †Supaia rigida
 * †Symphysurina
 * †Symphysurina cleora – or unidentified comparable form
 * †Symphysurina globocapitella
 * †Symphysurina illaenoides
 * †Symphysurina spicata – or unidentified comparable form
 * †Symphysurina uncaspicata
 * †Symphysurina walcotti
 * †Symphysurus – tentative report
 * †Synarmocrinus
 * †Synarmocrinus depressus – type locality for species
 * †Syntrophina
 * †Syntrophina campbelli – or unidentified comparable form
 * †Syntrophina carinifera
 * †Syntrophopsis
 * †Syntrophopsis polita
 * †Syntrophopsis transversa
 * Syringoporid.jpg †[[Syringopora]]
 * †Syringopora aculeata
 * †Syringopora surcularia
 * †Syringothyris
 * †Syringothyris textus

T

 * †Tabulipora
 * †Tabulipora atacta
 * †Tabulipora carbonaria
 * †Tabulipora ricta
 * †Tabulipora sarcinula
 * †Tabulipora stragula
 * †Taeniopteris
 * †Talpaspongia
 * †Talpaspongia clavata
 * Teichichnus burrows.jpg †[[Teichichnus]] – tentative report
 * †Telangium
 * †Telangium affine
 * †Terranovella
 * †Tesselacauda
 * †Tesselacauda depressa – or unidentified comparable form
 * †Testiispongia – type locality for genus
 * †Testiispongia venula – type locality for species
 * †Testispongia
 * †Testispongia venula
 * †Tetragraptus
 * †Tetragraptus quadribrachiatus – or unidentified comparable form
 * ThalassinoidesIsrael.JPG †[[Thalassinoides]] – tentative report
 * †Thamniscus
 * †Thamniscus raribifurcatus
 * †Thamnosia – or unidentified comparable form
 * †Thamnosia arctica – tentative report
 * †Timania
 * †Timaniella
 * †Timaniella pseudocamerata
 * †Tingia
 * †Tingia placida – type locality for species
 * †Tomagnostella
 * †Tomagnostella exsculpta
 * †Tonkinella
 * †Tonkinella breviceps
 * †Tonkinella valida
 * †Torynifer
 * †Totiglobus – tentative report
 * †Totiglobus lloydi
 * †Trace
 * †Trace fossil
 * †Trachycheilus
 * †Trachycheilus granulosus
 * †Trachycheilus whirlwindensis
 * †Trematorthis – tentative report
 * †Tricitictes
 * †Tricrepicephalus
 * †Tricrepicephalus teres
 * †Trigonocarpus
 * †Trigonocarpus noeggerathii
 * †Trigonocerca
 * †Trigonocerca typica
 * †Trigonocercella
 * †Trigonocercella acuta
 * Arthrorhachis tarda draw entite.png †[[Trinodus]]
 * †Triplagnostus
 * †Triplagnostus gibbus
 * †Triplophylites
 * †Triplophylites compressus
 * †Triplophylites ellipticus
 * †Triplophylites subcrassus
 * †Triticites
 * †Tritoechia
 * †Tritoechia loganensis
 * †Tritoechia sinuata
 * †Trocholites
 * †Trochophyllum – tentative report
 * †Trymataspis
 * †Trymataspis depressa
 * Tseajaia BW.jpg †[[Tseajaia]]
 * †Tseajaia campi – type locality for species
 * †Tulepyge
 * †Tulepyge tulensis – type locality for species
 * †Tumicephalus
 * †Tumicephalus depressus
 * †Tuzoia
 * †Tuzoia argenta
 * †Tuzoia guntheri
 * †Tuzoia retifera
 * †Tympanuella
 * †Tympanuella transversa

U

 * †Ufimia
 * †Ulrichodina – tentative report
 * †Uromystrum
 * †Uromystrum validum – or unidentified comparable form
 * †Utagnostus
 * †Utagnostus trispinulus
 * †Utahacanthus – type locality for genus
 * †Utahacanthus guntheri – type locality for species
 * †Utahcaris
 * †Utahcaris orion
 * Utaherpeton.jpg †[[Utaherpeton]] – type locality for genus
 * †Utaherpeton franklini – type locality for species
 * †Utaspis
 * †Utaspis marjumensis

V

 * †Valospongia
 * †Valospongia gigantis – type locality for species
 * †Valospongia gigantus
 * VauxiaBurgess.jpg †[[Vauxia]]
 * †Vauxia bellula
 * †Vauxia gracilenta
 * †Vauxia magna – type locality for species
 * †Verkhotomia
 * †Verkhotomia plenoides – or unidentified comparable form
 * †Vesiculophyllum
 * †Virgiana
 * †Virgiana utahensis – type locality for species
 * †Vnigripecten
 * †Vnigripecten phosphaticus – or unidentified comparable form
 * †Vorticina
 * †Vorticina vortex – type locality for species

W

 * †Waagenites
 * †Waagenites type locality for species A – informal
 * †Waagenoconcha
 * †Wahwahlingula
 * †Wahwahlingula sevierensis – type locality for species
 * †Walcottoceras – tentative report
 * †Walcottoceras monsense
 * Waptia fieldensis Restoration cropped.jpg †[[Waptia]]
 * †Waptia fieldensis – or unidentified comparable form
 * †Warthia – tentative report
 * †Weeksina
 * †Weeksina unispina
 * †Wellerella
 * †Wellerella osagensis
 * †Wellerella tetrahedra
 * †Wewokella
 * †Wewokella solida
 * †Wilkingia
 * †Wimanella
 * Wiwaxia corrugata cropped.png †[[Wiwaxia]]
 * †Wiwaxia corrugata
 * †Worthenia

X

 * Xenacanthus NT small cropped.png †[[Xenacanthus]] – or unidentified related form
 * †Xenacanthus texensis
 * †Xenostegium
 * †Xenostegium acuminferentis – or unidentified comparable form
 * †Xenostegium franklinense
 * †Xestotrema
 * †Xestotrema pulchrum
 * †Xystocrania – tentative report
 * †Xystocrania perforator

Y

 * †Yakia – tentative report
 * †Yakovlevia
 * †Yakovlevia multistriata
 * †Yuknessaspis
 * †Yuknessaspis benningtonis – type locality for species
 * †Yuknessia
 * †Yuknessia simplex
 * †Yunnania

Z

 * †Zacanthoides
 * †Zacanthoides divergens
 * †Zacanthoides divergensis
 * †Zacanthoides fronslicinus
 * †Zacanthoides grabaui
 * †Zacanthoides idahoensis
 * †Zacanthoides prolixis
 * †Zaphrentites
 * †Zhanatella
 * †Zhanatella utahensis
 * †Zittelella
 * †Zittelella clarae – or unidentified comparable form
 * †Zittelloceras