This list of the Mesozoic 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 252.17 and 66 million years of age.

Contents

• 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
• References

A

• † Abrekopsis
  • † Abrekopsis depresispirus – type locality for species
• † Abydosaurus – type locality for genus
  • † Abydosaurus mcintoshi – type locality for species
• † Aclistochara
  • † Aclistochara bransoni

• 

  † Acristavus
  • † Acristavus gagslarsoni
• † Adelodelphys
  • † Adelodelphys muizoni
• † Adelolophus – type locality for genus
  • † Adelolophus hutchisoni – type locality for species
• † Admetopsis
• † Adocus
• † Aenigmadelphys
  • † Aenigmadelphys archeri – type locality for species

• 

  † Alamosaurus
  • † Alamosaurus sanjuanensis
• † Albanerpeton
  • † Albanerpeton cifellii – type locality for species
  • † Albanerpeton galaktion
  • † Albanerpeton gracilis
  • † Albanerpeton nexuosus
• † Allocrioceras
  • † Allocrioceras annulatum

• 

  † Allosaurus
  • † Allosaurus fragilis
  • † Allosaurus jimmadseni – type locality for species
• † Alphadon
  • † Alphadon attaragos
  • † Alphadon eatoni – type locality for species
  • † Alphadon halleyi
  • † Alphadon marshi – or unidentified comparable form
  • † Alphadon sahnii
• † Alzadites
  • † Alzadites incomptus
• † Amberleya – tentative report
• † Amblotherium
  • † Amblotherium gracilis
• † Ameribaatar – type locality for genus
  • † Ameribaatar zofiae – type locality for species
• † Ameribataar
  • † Ameribataar zofiae
• Amia
• † Ampezzopleura
  • † Ampezzopleura rugosa – type locality for species
• † Amplovalvata
• † Anaflemingites
  • † Anaflemingites silberlingi – or unidentified related form
• † Anasibirites
  • † Anasibirites angulosus
  • † Anasibirites bastini
  • † Anasibirites hircinus
  • † Anasibirites kingianus
  • † Anasibirites mojsisovicsi
  • † Anasibirites multiformis
  • † Anasibirites tenuistriatus
• † Anawasatchites
• † Anchisauripus
  • † Anchisauripus sillimani
• † Anchistodelphys – type locality for genus
  • † Anchistodelphys archibaldi – type locality for species
  • † Anchistodelphys delicatus – type locality for species
• † Anchura
• † Anemia
  • † Anemia dakotensis
  • † Anemia dicksoniana
  • † Anemia fremontii

• 

  † Animantarx – type locality for genus
  • † Animantarx ramaljonesi – type locality for species
• † Anisomyon
• Anomia
• † Anomoepus
• † Apatopus
  • † Apatopus lineatus
• † Apatosaurus
  • † Apatosaurus louisae – type locality for species
• † Apistodon – report made of unidentified related form or using admittedly obsolete nomenclature
  • † Apistodon exiguus – or unidentified related form
• † Aquiladelphis – tentative report
  • † Aquiladelphis laurae – type locality for species
• † Araeodon
  • † Araeodon intermissus
• † Araucariacites
  • † Araucariacites australis
  • † Araucariacites fissus

• 

  † Araucarioxylon
• † Arcomya
• † Arctoceras
  • † Arctoceras tuberculatum
• † Arctoprionites
  • † Arctoprionites resseri
• † Arvinachelys – type locality for genus
  • † Arvinachelys goldeni – type locality for species
• † Aspenites
  • † Aspenites acutus
• Astarte
  • † Astarte livingstonensis
  • † Astarte meeki

• 

  Asteriacites
  • † Asteriacites lumbricalis
• † Astralopteris
  • † Astralopteris coloradica
• † Astroconodon
  • † Astroconodon delicatus – type locality for species
• † Atreipus
  • † Atreipus milfordensis
• † Athenar – type locality for genus
  • †Athenar bermani – type locality for species
• † Aublysodon – tentative report
• † Aucellina
• † Austrotindaria
  • † Austrotindaria canalensis
  • † Austrotindaria svalbardensis
• † Avitotherium – type locality for genus
  • † Avitotherium utahensis – type locality for species

B

• † Baena
• † Baibisha – or unidentified comparable form
• † Bajarunia
  • † Bajarunia confusionensis – type locality for species
• † Bakevellia
  • † Bakevellia costata
  • † Bakevellia costatus – or unidentified comparable form
  • † Bakevellia exporrecta
  • † Bakevellia silberlingi – type locality for species

• 

  † Barosaurus
  • † Barosaurus lentus
• † Basilemys
• † Batrachopus
• † Battenizyga
  • † Battenizyga eotriassica – type locality for species
• † Bernissartia
• † Bicuspidon – type locality for genus
  • † Bicuspidon numerosus – type locality for species
  • † Bicuspidon smikros – type locality for species
• † Borissiakoceras
• † Bothriagenys – type locality for genus
  • † Bothriagenys mysterion – type locality for species

• 

  † Brachauchenius
  • † Brachauchenius lucasi
• † Brachiosaurus
• † Brachychirotherium
  • † Brachychirotherium thuringiacum
• † Brachyphyllum
  • † Brachyphyllum crassicaule
• † Brasilichnium
• † Brontomerus – type locality for genus
  • † Brontomerus mcintoshi – type locality for species
• † Brontopodus

• 

  † Brontosaurus
  • † Brontosaurus parvus
• † Brownichnus
  • † Brownichnus favosites – type locality for species
• † Bryceomys
  • † Bryceomys fumosus – type locality for species
  • † Bryceomys hadrosus
  • † Bryceomys intermedius – type locality for species

C

• † Callialasporites
  • † Callialasporites segmentatus
  • † Callialasporites turbatus
• Callistina
  • † Callistina alta – or unidentified related form
• † Calycoceras
  • † Calycoceras naviculare

• 

  † Camarasaurus – type locality for genus^{[ citation needed ]}
  • † Camarasaurus lentus – type locality for species
• Campeloma
• † Camptonectes
  • † Camptonectes platessiformis
  • † Camptonectes stygius
• † Camptosaurus
  • † Camptosaurus dispar
• † Cantioscyllium – or unidentified comparable form
• † Carmelopodus – type locality for genus
  • † Carmelopodus untermannorum – type locality for species
• † Carycorbula
  • † Carycorbula nematophora
• † Cassiope
  • † Cassiope utahensis
• † Cedaromys
  • † Cedaromys bestia – type locality for species
  • † Cedaromys hutchisoni – or unidentified comparable form
  • † Cedaromys minimus – type locality for species
  • † Cedaromys parvus – type locality for species
• † Cedarosaurus – type locality for genus
  • † Cedarosaurus weiskopfae – type locality for species
• † Cedarpelta – type locality for genus
  • † Cedarpelta bilbeyhallorum – type locality for species
• † Cedrorestes – type locality for genus
  • † Cedrorestes crichtoni – type locality for species
• † Cedroxylon
• † Ceratodus

• 

  † Ceratosaurus
  • † Ceratosaurus nasicornis
  • † Ceratosaurus dentisulcatus – type locality for species
• † Cercomya
  • † Cercomya punctata
• † Cerebropollenites
  • † Cerebropollenites macroverruesus
• Cerithiopsis
• † Chamops
  • † Chamops segnis
• † Characichnos
• † Chartronella
  • † Chartronella pagina – type locality for species
  • † Chartronella unicostata – type locality for species

• 

  † Chinlea – type locality for genus
  • † Chinlea sorenseni – type locality for species
• † Chirotherium
  • † Chirotherium rex – or unidentified comparable form
• Chlamys
• † Chondrites
• † Churkites
  • † Churkites noblei
• † Cimexomys
  • † Cimexomys antiquus – or unidentified comparable form
  • † Cimexomys gregoryi – type locality for species
• † Cimolodon
  • † Cimolodon electus
  • † Cimolodon nitidus – or unidentified comparable form
  • † Cimolodon similis
  • † Cimolodon wardi – type locality for species

• 

  † Cimolomys
  • † Cimolomys clarki
  • † Cimolomys milliensis – type locality for species
• † Cionichthys – type locality for genus
  • † Cionichthys dunklei – type locality for species
• Cladophlebis
  • † Cladophlebis constricta
  • † Cladophlebis parva
• † Claraia
• † Cnodontosaurus – type locality for genus
  • † Cnodontosaurus suchockii – type locality for species
• † Coelophysis – tentative report
• † Coelostylina
  • † Coelostylina angulifera – or unidentified comparable form
  • † Coelostylina costata – type locality for species
  • † Coelostylina virginensis – type locality for species

• 

  † Coelurus
  • † Coelurus fragilis
• † Compsemys
• † Confusionella
  • † Confusionella loczyi
• † Coniophis
• † Coniopteris
  • † Coniopteris hymenophylloides
• † Contogenys
  • † Contogenys sloani – or unidentified comparable form
• Corbula
• † Cordillerites
  • † Cordillerites compressus
• † Corviconodon
  • † Corviconodon utahensis – type locality for species
• Cossmannea
  • † Cossmannea imayi
  • † Cossmannea imlayi
  • † Cossmannea kanabensis
• † Costatoria
• † Cowboyiceras – type locality for genus
  • † Cowboyiceras farwestense – type locality for species
• † Cretorectolobus
• † Crittendenia
• † Ctenacodon
• † Cteniogenys
• † Ctenostreon
  • † Ctenostreon gikshanensis – or unidentified comparable form
• Cucullaea
  • † Cucullaea haguei
• † Culicolestes – type locality for genus
  • † Culicolestes kielanae – type locality for species

• 

  † Cycadeoidea
  • † Cycadeoidea cleavelandii
  • † Cycadeoidea medullara
• Cylichna
• † Cylindrobullina
  • † Cylindrobullina convexa – type locality for species
• † Cymbophora
• † Cynepteris
  • † Cynepteris lasiophora
• † Cypellospongia – type locality for genus
  • † Cypellospongia fimbriartis – type locality for species
• † Czekanowskia
  • † Czekanowskia turneri – type locality for species

D

• † Dakotadens – type locality for genus
  • † Dakotadens morrowi – type locality for species
  • † Dakotadens pertritus – type locality for species
• † Dakotamys
  • † Dakotamys malcolmi – type locality for species
• † Dakotaseps – type locality for genus
  • † Dakotaseps gillettorum – type locality for species
• † Dakotasuchus
  • † Dakotasuchus kingi
• † Deinonychus
• † Deinosuchus
  • † Deinosuchus hatcheri
• † Denazinemys
  • † Denazinemys nodosa
• Dentalium
  • † Dentalium sublineatum – or unidentified related form

• 

  † Diabloceratops – type locality for genus
  • † Diabloceratops eatoni – type locality for species
• † Dicothodon – type locality for genus
  • † Dicothodon cifelli
  • † Dicothodon cifellii – type locality for species
  • † Dicothodon moorensis – type locality for species
• † Dieneroceras
  • † Dieneroceras dieneri
• † Dimekodontosaurus – type locality for genus
  • † Dimekodontosaurus madseni – type locality for species
• † Dinehichnus – type locality for genus
  • † Dinehichnus socialis – type locality for species
• † Dinochelys – type locality for genus
  • † Dinochelys whitei – type locality for species
• † Dinophyton
  • † Dinophyton spinosus
• † Dinosauropodes – type locality for genus
  • † Dinosauropodes bransfordii
  • † Dinosauropodes magrawii – type locality for species
  • † Dinosauropodes osborni
  • † Dinosauropodes wilsoni
• † Diplochilus – tentative report

• 

  † Diplodocus
  • † Diplodocus hallorum
  • † Diplodocus longus
• Discinisca – report made of unidentified related form or using admittedly obsolete nomenclature
• † Docodon
• † Doswellia
• † Drepanocheilus
  • † Drepanocheilus ruidium
• † Dryolestes
  • † Dryolestes priscus
• † Dryosaurus
  • † Dryosaurus elderae – type locality for species
• † Dystrophaeus – type locality for genus
  • † Dystrophaeus viaemalae – type locality for species

E

• † Elegantinia
• Elliptio

• 

  † Enchodus
• † Enneabatrachus
• † Entalophora
  • † Entalophora stokesi
• † Entolioides
• † Entolium
• † Entradasuchus – type locality for genus
  • † Entradasuchus spinosus – type locality for species
• † Eoalphadon
  • † Eoalphadon clemensi – type locality for species
  • † Eoalphadon lillegraveni – type locality for species
  • † Eoalphadon woodburnei – type locality for species
• † Eocephalites
  • † Eocephalites primus
• † Eodelphis
• † Eoginkgoites

• 

  † Eolambia – type locality for genus
  • † Eolambia caroljonesa – type locality for species
• † Eopolycotylus – type locality for genus
  • † Eopolycotylus rankini – type locality for species
• † Equisetites
• † Equisetum
  • † Equisetum burchardtii
  • † Equisetum UD006 – informal
• † Eryma
  • † Eryma jungostrix
• † Eucalyptus
  • † Eucalyptus dakotensis
• † Eumorphotis
  • † Eumorphotis beneckei – or unidentified comparable form
  • † Eumorphotis ericius – type locality for species
  • † Eumorphotis hinnitidea
  • † Eumorphotis multiformis
  • † Eumorphotis venetiana
  • † Eumorphotis virginensis – type locality for species
• † Eunaticina
  • † Eunaticina textilis
• † Euomphaloceras
• † Euspira
  • † Euspira concinna
• † Euthlastus
  • † Euthlastus cordiformis
• † Eutretauranosuchus
• † Evazoum
• † Exesipollenites
  • † Exesipollenites tumulosus

• 

  † Exogyra
  • † Exogyra acroumbonata
  • † Exogyra levis
• † Exostinus – or unidentified comparable form

F

• † Fabrosaurus – tentative report

• 

  † Falcarius – type locality for genus
  • † Falcarius utahensis – type locality for species
• Ficus
  • † Ficus daphnogenoides
• † Flemingites
• † Fona – type locality for genus
  • † Fona herzogae – type locality for species
• † Frenelopsis
  • † Frenelopsis varians
  • † Frenelopsis variens

G

• 

  † Gastonia – type locality for genus
  • † Gastonia burgei – type locality for species
  • † Gastonia lorriemcwhinneyae – type locality for species
• † Geltena
• † Geminiraptor
  • † Geminiraptor suarezarum
• † Germanonautilus – tentative report
• † Gervillaria
  • † Gervillaria montanaensis
• † Gervillia
• Gleichenia
  • † Gleichenia comptoniaefolia
  • † Gleichenia delicatula
• † Glirodon – type locality for genus
  • † Glirodon grandis – type locality for species
• Globularia – tentative report
• † Glyptops
  • † Glyptops plicatulus – type locality for species
• † Gondolella
  • † Gondolella planata
• † Goniobasis – tentative report
  • † Goniobasis subtortuosa
• † Goniodiscus
  • † Goniodiscus smithi
• † Goniomya
  • † Goniomya montanaensis

• 

  † Goniopholis
• † Grallator
  • † Grallator cursorius
• † Grammatodon
  • † Grammatodon haguei
• † Gryphaea
  • † Gryphaea planoconvexa
• † Gryphaeostrea

• 

  † Gryposaurus
  • † Gryposaurus monumentensis – type locality for species
• † Guodunites
  • † Guodunites hooveri
• † Gwyneddichnium
• † Gypsonictops

H

• 

  † Hagryphus – type locality for genus
  • † Hagryphus giganteus – type locality for species
• † Hamulus – tentative report
  • † Hamulus subquadratus
• † Hanielites
• † Harmodontosaurus – type locality for genus
  • † Harmodontosaurus emeryensis – type locality for species
• † Hausmania
  • † Hausmania rigida
• † Hedenstroemia
  • † Hedenstroemia kossmati
• Hemiaster
  • † Hemiaster humphreysanus
• † Hemicalypterus – type locality for genus
  • † Hemicalypterus weiri – type locality for species
• † Heminajas – tentative report
  • † Heminajas balatonis – or unidentified comparable form
• † Hemiprionites
  • † Hemiprionites typus

• 

  † Hippodraco – type locality for genus
  • † Hippodraco scutodens – type locality for species
• † Hispanosauropus
• † Hoernesia
• † Holocrinus
  • † Holocrinus dubius – tentative report
  • † Holocrinus smithi
• † Homalopoma
  • † Homalopoma sinbadensis – type locality for species
• † Homomya
• † Hoplitosaurus – or unidentified comparable form
• † Hoplosuchus – type locality for genus
  • † Hoplosuchus kayi – type locality for species

• 

  † Hybodus
• † Hyporosopora
  • † Hyporosopora nielsoni – type locality for species

I

• † Iani – type locality for genus
  • † Iani smithi – type locality for species
• † Icacinoxylon
  • † Icacinoxylon pittiense – type locality for species
• † Idahocolumbites
  • † Idahocolumbites cheneyi

• 

  † Iguanacolossus – type locality for genus
  • † Iguanacolossus fortis – type locality for species
• † Iguanodon
  • † Iguanodon ottingeri – type locality for species
• Ilex
  • † Ilex serrata

• 

  † Inoceramus
  • † Inoceramus albertensis – or unidentified comparable form
  • † Inoceramus flavus
  • † Inoceramus gilberti
  • † Inoceramus koeneni
  • † Inoceramus pictus
  • † Inoceramus tenuistriatus – tentative report
  • † Inoceramus undabundus
• † Inyoites
  • † Inyoites beaverensis – type locality for species
  • † Inyoites oweni
• † Iqualadelphis
  • † Iqualadelphis lactea
• † Iridotriton – type locality for genus
  • † Iridotriton hechti – type locality for species
• † Ischyrhiza – or unidentified comparable form
• Isocrinus
  • † Isocrinus nicoleti

• 

  Isognomon
  • † Isognomon perplana – or unidentified comparable form
• † Iugomortiferum – type locality for genus
  • † Iugomortiferum thoringtoni – type locality for species

J

• † Janumys – type locality for genus
  • † Janumys erebos – type locality for species
  • † Janumys erebros
• † Jeanbesseiceras
  • † Jeanbesseiceras jacksoni
• † Jugulator
  • † Jugulator amplissimus
• † Juvenites
  • † Juvenites spathi – or unidentified related form
  • † Juvenites thermarum – or unidentified comparable form

K

• 

  † Kallirhynchia
  • † Kallirhynchia myrina – type locality for species
• † Kamerunoceras
• † Kashmirites
  • † Kashmirites confusionensis
  • † Kashmirites meeki
  • † Kashmirites nivalis
  • † Kashmirites perrini
  • † Kashmirites seerleyi
  • † Kashmirites stepheni – type locality for species
  • † Kashmirites subarmatus
  • † Kashmirites utahensis – type locality for species
• † Kayentapus
• † Kokopellia – type locality for genus
  • † Kokopellia juddi – type locality for species
• † Koparion – type locality for genus
  • † Koparion douglassi – type locality for species
• † Koreanaornis
  • † Koreanaornis hamanensis – or unidentified comparable form

• 

  † Kosmoceratops – type locality for genus
  • † Kosmoceratops richardsoni – type locality for species
• † Kouphichnium

L

• † Ladinaticella
  • † Ladinaticella striatocostata
• † Lanceolites
  • † Lanceolites bicarinatus
  • † Lanceolites compactus
• † Lasalichthys – type locality for genus
  • † Lasalichthys hillsi – type locality for species
• † Latochara
  • † Latochara latitruncata
• † Laubopsis – tentative report
• † Legumen

• 

  † Leidyosuchus
• † Lenticidaris – type locality for genus
  • † Lenticidaris utahensis – type locality for species
• † Lepidotes
  • † Lepidotes walcotti – type locality for species
• Lepisosteus
• † Leptalestes
• † Leptochamops
  • † Leptochamops denticulatus
• † Leptochondria
  • † Leptochondria curtocardinalis
  • † Leptochondria nuetzeli – type locality for species
  • † Leptochondria occidanea – type locality for species
  • † Leptochondria xijinwulanensis
• Lima
• † Lingularia
  • † Lingularia borealis
• † Liopistha
  • † Liopistha meeki
• † Liostrea
  • † Liostrea strigilecula
• † Liriophyllum
  • † Liriophyllum UD012 – informal
• † Lissodus
• † Litakis
  • † Litakis gilmorei
• † Lonchidion
• Lopha
  • † Lopha engelmanni – or unidentified related form
• Lucina
• † Lyosoma
  • † Lyosoma enoda
  • † Lyosoma powelli

• 

  † Lythronax – type locality for genus
  • † Lythronax argestes – type locality for species

M

• 

  † Machairoceratops – type locality for genus
  • † Machairoceratops cronusi – type locality for species
• † Macroelongatoolithus
  • † Macroelongatoolithus carlylei – type locality for species
• † Mactromya – tentative report
• † Magadiceramus
  • † Magadiceramus crenelatus
  • † Magadiceramus crenistriatus
  • † Magadiceramus soukupi
• Magnolia
  • † Magnolia boulayana
• † Mammites
  • † Mammites nodosoides

• 

  † Marshosaurus – type locality for genus
  • † Marshosaurus bicentesimus – type locality for species
• † Martharaptor – type locality for genus
  • † Martharaptor greenriverensis – type locality for species
• † Matonidium
  • † Matonidium brownii
  • † Matonidium lancipinnulum
• † Meekoceras
  • † Meekoceras davisi
  • † Meekoceras gracilitatis
  • † Meekoceras millardense – type locality for species
  • † Meekoceras olivieri – type locality for species
• † Megalosauripus
• † Megasphaeroceras
  • † Megasphaeroceras rotundum – or unidentified comparable form
• † Melvius
  • † Melvius chauliodous – or unidentified comparable form

• 

  † Meniscoessus
  • † Meniscoessus intermedius
• † Meniscognathus
  • † Meniscognathus altmani – or unidentified comparable form
  • † Meniscognathus molybrochoros – type locality for species
• † Mesembrioxylon
  • † Mesembrioxylon stokesi
  • † Mesembrioxylon stokesii
• † Mesembryoxylon
• † Mesodma
  • † Mesodma formosa – or unidentified comparable form
  • † Mesodma hensleighi – or unidentified comparable form
  • † Mesodma minor – or unidentified comparable form
  • † Mesodma thompsoni – or unidentified comparable form
• † Mesostoma
• † Metoicoceras
  • † Metoicoceras geslinianum
• † Microcachrydites
• † Microconchus
  • † Microconchus utahensis
• † Microeciella
  • † Microeciella duoflavina
  • † Microeciella pollostos – type locality for species
• † Minersvillites – type locality for genus
  • † Minersvillites farai – type locality for species
• † Miocidaris
  • † Miocidaris utahensis

• 

  † Moabosaurus – type locality for genus
  • † Moabosaurus utahensis – type locality for species
• Modiolus
  • † Modiolus isonemus
  • † Modiolus subimbricatus
• † Monanthesia
• † Monocnemodon – type locality for genus
  • † Monocnemodon syphakos – type locality for species
• † Moros – type locality for genus ^[1]
  • † Moros intrepidus – type locality for species ^[2]
• † Myalina
• † Myledaphus
  • † Myledaphus bipartitus
• † Myoconcha
  • † Myoconcha plana – or unidentified comparable form
• † Myopholas
  • † Myopholas hardyi

• 

  † Myophorella
  • † Myophorella livinigstonensis
  • † Myophorella monatanaensis
  • † Myophorella yellowstonensis
• † Myophoria
• † Mytiloides
  • † Mytiloides submytiloides – or unidentified related form
• † Mytilus
  • † Mytilus whitei – or unidentified comparable form

N

• † Naomichelys

• 

  † Nasutoceratops – type locality for genus
  • † Nasutoceratops titusi – type locality for species
• † Naticopsis
  • † Naticopsis depressispira
  • † Naticopsis fenestravella – type locality for species
  • † Naticopsis utahensis – type locality for species
• † Natiria
  • † Natiria aequicostata – type locality for species
  • † Natiria costata – or unidentified comparable form
• † Nedcolbertia – type locality for genus
  • † Nedcolbertia justinhoffmanni – type locality for species
• † Nemodon
• † Neocardioceras
  • † Neocardioceras juddii
• † Neocrioceras
• † Neoschizodus
  • † Neoschizodus laevigatus
  • † Neoschizodus orbicularis – or unidentified comparable form
  • † Neoschizodus praeorbicularis
  • † Neoschizodus thaynesianus – type locality for species
• † Neridomus – tentative report

• 

  † Nerinea – tentative report
• † Neritaria
  • † Neritaria costata – type locality for species
• Neritina
  • † Neritina phaseolaris
• † Neurankylus
• † Nezpercius
  • † Nezpercius dodsoni
• † Nilsonia
  • † Nilsonia lewisii – type locality for species
• † Nilssoniopteris
• † Nododelphinula – tentative report
• † Normannites – tentative report
  • † Normannites crickmayi – or unidentified related form

• 

  † Nothronychus
  • † Nothronychus graffami – type locality for species
• Nucula
• Nuculana
  • † Nuculana mutuata – or unidentified comparable form
• † Nymphalucina
  • † Nymphalucina linearia – or unidentified related form

O

• † Obnixia – type locality for genus
  • † Obnixia thaynesiana
• † Odaxosaurus
  • † Odaxosaurus piger – or unidentified comparable form
  • † Odaxosaurus priscus
  • † Odaxosaurus roosevelti – type locality for species
• † Omphaloptycha
  • † Omphaloptycha hormolira – type locality for species
• † Omphaloptychia
  • † Omphaloptychia laevisphaera – type locality for species
• Oncousoecia – tentative report
• † Ooliticia – tentative report
• † Ophioglypha
  • † Ophioglypha utahensis – type locality for species
• † Opisthias
• † Ornithomimus
• † Osteocallis
  • † Osteocallis mandibulus
• Ostrea
  • † Ostrea occidentalis
  • † Ostrea strigulecula

• 

  † Othnielosaurus
  • † Othnielosaurus consors
• † Otozoum
• † Ovaloolithus
  • † Ovaloolithus tenuisus – type locality for species
  • † Ovaloolithus utahensis – type locality for species
• † Owenites
  • † Owenites carpenteri
  • † Owenites koeneni

P

• † Pachyomphalus
  • † Pachyomphalus americanus – type locality for species

• 

  † Pagiophyllum
• † Paiutemys – type locality for genus
  • † Paiutemys tibert – type locality for species
• † Palaeophycus – or unidentified comparable form
• † Palaeopiceoxylon
  • † Palaeopiceoxylon thinosu
  • † Palaeopiceoxylon thinosus
• † Palaeoscincosaurus
  • † Palaeoscincosaurus pharkidodon – type locality for species
• † Paleoaster
  • † Paleoaster inquirenda
• † Palmulasaurus – type locality for genus
  • † Palmulasaurus quadratus – type locality for species
• † Parachondroceras
  • † Parachondroceras andrewsi
  • † Parachondroceras filicostatum – or unidentified comparable form
• † Paracimexomys
  • † Paracimexomys judithae – or unidentified comparable form
  • † Paracimexomys magnus
  • † Paracimexomys perplexus – type locality for species
  • † Paracimexomys priscus – or unidentified comparable form
  • † Paracimexomys robisoni – type locality for species
• † Paraglyphanodon – type locality for genus
  • † Paraglyphanodon gazini – type locality for species
  • † Paraglyphanodon utahensis – type locality for species
• † Parallelodon – tentative report
  • † Parallelodon beyrichii – or unidentified related form
• † Paramacellodus
  • † Paramacellodus oweni – or unidentified comparable form
• † Paranyctoides
• † Paraphyllanthoxylon
  • † Paraphyllanthoxylon utahense
• † Parasaniwa
  • † Parasaniwa cynochoros – type locality for species
  • † Parasaniwa wyomingensis – or unidentified comparable form

• 

  † Parasaurolophus
  • † Parasaurolophus cyrtocristatus
• † Pariadens
  • † Pariadens kirklandi – type locality for species
  • † Pariadens mckennai – type locality for species
• † Parmicorbula
• † Paronychodon – or unidentified comparable form
• † Parotosuchus
  • † Parotosuchus nov. spec. – informal
• † Parussuria
  • † Parussuria compressa
• † Patulopora
  • † Patulopora cutleri
• † Paullia
• † Pediomys – report made of unidentified related form or using admittedly obsolete nomenclature
• † Pegmavalvula
  • † Pegmavalvula triassica
• † Pelecypodichnus
• † Peloroplites – type locality for genus
  • † Peloroplites cedrimontanus – type locality for species
• † Peneteius – type locality for genus
  • † Peneteius saueri – type locality for species
• † Pentasauropus
• † Periallus
  • † Periallus woodsidensis
• † Perissoptera
• † Permophorus
  • † Permophorus bregeri – or unidentified comparable form
  • † Permophorus triassicus
• † Pernopecten
• † Phelopteria
  • † Phelopteria minuta – or unidentified comparable form
• † Phlebopteris

• 

  Pholadomya
  • † Pholadomya inaequiplicata
  • † Pholadomya kingi
• † Piarorhynchella
  • † Piarorhynchella triassica
  • † Piarorhynchella triassicus
• † Picopsis
• † Pinacosuchus – type locality for genus
  • † Pinacosuchus mantiensis – type locality for species
• Pinna
  • † Pinna kingi
• † Pistia – report made of unidentified related form or using admittedly obsolete nomenclature
  • † Pistia corrugata
• † Pityoxylon

• 

  † Placenticeras
  • † Placenticeras cumminsi
• Placopsilina
• † Plagioglypta
• † Plagiostoma
  • † Plagiostoma occidentalis
  • † Plagiostoma ziona
• † Planicoxa – type locality for genus
  • † Planicoxa venenica – type locality for species
• † Planolites
• † Plataninium
• † Plesiopinna
• † Pleuromya
  • † Pleuromya musculoides – or unidentified comparable form
  • † Pleuromya prima – type locality for species
  • † Pleuromya subcompressa
• † Pleuronautilus
• † Pleuronectites
• Pleurotomaria – tentative report
• Plicatula
  • † Plicatula ferryi – or unidentified comparable form
• † Podozamites
• † Polyacrodus – tentative report
• † Polyglyphanodon – type locality for genus
  • † Polyglyphanodon sternbergi – type locality for species
• † Polygyrina

• 

  † Poposaurus
  • † Poposaurus gracilis
• † Preflorianites
  • † Preflorianites toulai
• † Preprismatoolithus
  • † Preprismatoolithus coloradensis
• † Priacodon
• † Primaderma – type locality for genus
  • † Primaderma nessovi – type locality for species
• † Prismatoolithus
  • † Prismatoolithus jenseni – type locality for species
• † Procerithium – tentative report
• † Promathildia
  • † Promathildia spirocostata – type locality for species
• † Promyalina
  • † Promyalina putiatinensis
  • † Promyalina spathi
• † Promysidiella
• † Pronoella
  • † Pronoella cinnabarensis – or unidentified comparable form
  • † Pronoella uintahensis
• † Proplacenticeras
  • † Proplacenticeras stantoni
• † Prorokia
  • † Prorokia fontenellensis
• † Protalphadon
• † Protocardia
• † Protogusarella
  • † Protogusarella smithi
• † Protolambda
  • † Protolambda hatcheri - North Horn Formation
• † Protopis
  • † Protopis waageni – or unidentified related form
• † Protovirgularia
• † Psalandon – tentative report
• † Pseudaspidoceras
• † Pseudocalycoceras
• † Pseudocorbula
• † Pseudohypolophus

• 

  † Pseudomelania
• † Pseudomyoconcha – tentative report
• † Pseudoptera
• † Pseudosageceras
  • † Pseudosageceras multilobatum
• † Pseudosaurillus – or unidentified comparable form
• † Pseudotetrasauropus
• † Pseudotritonium
  • † Pseudotritonium sciaphosterum – type locality for species
• † Psilomya
  • † Psilomya concentrica – or unidentified related form
  • † Psilomya elongata – or unidentified related form
• † Pteraichnus
  • † Pteraichnus saltwashensis – or unidentified comparable form
  • † Pteraichnus stokesi – or unidentified comparable form
• † Ptychotrigon

• 

  Pycnodonte
  • † Pycnodonte newberryi

Q

• † Quenstedtia
  • † Quenstedtia bathonica – or unidentified related form

R

• † Radioceras
  • † Radioceras evolvens – or unidentified related form

• 

  † Redondasaurus
  • † Redondasaurus gregorii
• Rhabdocolpus
  • † Rhabdocolpus viriosus
• † Rhadinosteus – type locality for genus
  • † Rhadinosteus parvus – type locality for species
• † Rhynchonella – report made of unidentified related form or using admittedly obsolete nomenclature
• † Rhynchosauroides
  • † Rhynchosauroides schochardti
• † Rhynchostreon
  • † Rhynchostreon levis

• 

  † Richardoestesia
  • † Richardoestesia isosceles – or unidentified comparable form
• Rogerella
• † Rotodactylus
  • † Rotodactylus cursorius – type locality for species

S

• † Sabalites
  • † Sabalites NE008 – informal
• Salix
  • † Salix newberryana

• 

  † Sauropelta – or unidentified comparable form
• † Scalamagnus
  • † Scalamagnus tropicensis – type locality for species
• † Scapherpeton
• † Schillerosaurus – type locality for genus
  • † Schillerosaurus utahensis – type locality for species
• † Sciponoceras
  • † Sciponoceras gracile
• † Scotiophryne
  • † Scotiophryne pustulosa
• † Scoyenia

• 

  † Seitaad – type locality for genus
  • † Seitaad ruessi – type locality for species
• † Sementiconcha – type locality for genus
  • † Sementiconcha recuperator – type locality for species
• † Semionotus
  • † Semionotus kanabensis – type locality for species
• Serpula
  • † Serpula intrica
  • † Serpula large
• † Sexta
  • † Sexta navicula – or unidentified related form

• 

  † Siats – type locality for genus
  • † Siats meekerorum – type locality for species
• † Simplicidium
• † Sinbadelphys
  • † Sinbadelphys schmidti
• † Sinbadiella – type locality for genus
  • † Sinbadiella pygmaea – type locality for species
• † Skolithos
• † Sohlites
  • † Sohlites spinosus
• Solemya
  • † Solemya obscura
• † Soleniscus
• † Spalacolestes
  • † Spalacolestes cretulablatta
  • † Spalacolestes inconcinnus – type locality for species
• † Spalacotheridium – type locality for genus
  • † Spalacotheridium mckennai – type locality for species
  • † Spalacotheridium noblei

• 

  † Spheroolithus
• † Spheruprismatoolithus – type locality for genus
  • † Spheruprismatoolithus condensis
  • † Spheruprismatoolithus condensus – type locality for species
• Spirorbis – report made of unidentified related form or using admittedly obsolete nomenclature
  • † Spirorbis valvata – or unidentified comparable form
• † Spongioolithus – type locality for genus
  • † Spongioolithus hirschi – type locality for species
• † Squatirhina
  • † Squatirhina americana
• † Stagonolepis
• † Stegopodus – type locality for genus
  • † Stegopodus czerkasi – type locality for species

• 

  † Stegosaurus
  • † Stegosaurus stenops – or unidentified comparable form
  • † Stegosaurus ungulatus
• † Stellatochara
  • † Stellatochara obovata
• † Stemmatoceras
  • † Stemmatoceras albertense – or unidentified related form
  • † Stemmatoceras arcicostum
• † Stephanoceras
  • † Stephanoceras nodosum – or unidentified related form

• 

  † Stokesosaurus – type locality for genus
  • † Stokesosaurus clevelandi – type locality for species
• Stomatopora
• † Stomohamites
• † Strobeus
  • † Strobeus batteni
• † Submeekoceras
  • † Submeekoceras mushbachanum
• † Symmetrocapulus – tentative report
  • † Symmetrocapulus corrugatus
• † Symmetrodontoides
  • † Symmetrodontoides foxi – type locality for species
  • † Symmetrodontoides oligodontos – type locality for species
• † Syncyclonema
• † Synorichthys
  • † Synorichthys stewarti

T

• 

  † Talos – type locality for genus
  • † Talos sampsoni – type locality for species
• † Tancredia – tentative report
• † Tanycolagreus
  • † Tanycolagreus topwilsoni
• † Teinostomopsis – tentative report
• † Tempskya
  • † Tempskya jonesii – type locality for species
  • † Tempskya knowltoni
  • † Tempskya minor
  • † Tempskya superba
  • † Tempskya whiteheadi – type locality for species
• † Tenontosaurus

• 

  † Teratophoneus – type locality for genus
  • † Teratophoneus curriei – type locality for species
• Teredolites
  • † Teredolites clavatus
• † Tethyaster
  • † Tethyaster jurassicus – type locality for species
• † Tetrasauropus
• † Thalassinoides
• † Therangopodus – tentative report
• † Therangospodus – type locality for genus
  • † Therangospodus pandemicus – type locality for species
• † Theretairus
• † Thescelus
  • † Thescelus insiliens
• Thracia
  • † Thracia weedi
• † Tirolites
  • † Tirolites carniolicus – tentative report
  • † Tirolites smithi – or unidentified related form

• 

  † Torvosaurus
• † Toxolophosaurus – or unidentified comparable form
• † Trachodon
• † Torosaurus
  • † Torosaurus utahensis
• † Triconolestes – type locality for genus
  • † Triconolestes curvicuspis – type locality for species
• † Trigonia
  • † Trigonia americana
  • † Trigonia elegantissima
  • † Trigonia montanaensis
• † Trigonodus
  • † Trigonodus orientalis – or unidentified comparable form
  • † Trigonodus sandbergeri – or unidentified comparable form
  • † Trigonodus sandbergi – or unidentified comparable form

• 

  † Trinacromerum
  • † Trinacromerum bentonianum – tentative report
• † Tripennaculus – type locality for genus
  • † Tripennaculus eatoni – type locality for species
• † Trisauropodiscus
  • † Trisauropodiscus moabensis – type locality for species
• Trochocyathus
• † Trochosmilia
  • † Trochosmilia moorei – type locality for species
• † Tulotomops
  • † Tulotomops laevibasalis
• † Turgidodon – type locality for genus
  • † Turgidodon lillegraveni – type locality for species
  • † Turgidodon madseni – type locality for species
  • † Turgidodon russelli – or unidentified comparable form
• Turritella
  • † Turritella whitei
• † Tylostoma – tentative report

• 

  † Tyrannosauripus – type locality for genus
  • † Tyrannosauripus petersoni – type locality for species
• † Tyrannosaurus

U

• † Undichnia
• † Unicardium
• † Unionites
  • † Unionites borealis – or unidentified comparable form
  • † Unionites fassaensis
• † Ussurites
  • † Ussurites hosei
• † Utahceratops – type locality for genus
  • † Utahceratops gettyi – type locality for species
• † Utahgenys – type locality for genus
  • † Utahgenys antongai – type locality for species
  • † Utahgenys evansi – type locality for species

• 

  † Utahraptor – type locality for genus
  • † Utahraptor ostrommaysi – type locality for species
• † Uteodon – type locality for genus
  • † Uteodon aphanoecetes – type locality for species
  • † Utetitan – type locality for genus
    • † Utetitan zellaguymondeweyae – type locality for species

V

• Valvata

• 

  † Vancleavea
  • † Vancleavea campi
• † Varalphadon – type locality for genus
  • † Varalphadon crebreforme – type locality for species
  • † Varalphadon wahweapensis – type locality for species
• † Vaugonia
  • † Vaugonia conradi
  • † Vaugonia utahensis
• † Venenosaurus – type locality for genus
  • † Venenosaurus dicrocei – type locality for species
• † Vercherites
  • † Vercherites undulatus – type locality for species
• † Vex

• 

  Viviparus

W

• † Wailiceras
  • † Wailiceras aemulus – or unidentified comparable form
• † Wasatchites
  • † Wasatchites perrini
• † Webbsaurus – type locality for genus
  • † Webbsaurus lofgreni – type locality for species
• † Worthenia
  • † Worthenia windowblindensis – type locality for species
• † Wortheniella
  • † Wortheniella canalifera – or unidentified comparable form
• † Worthoceras
• † Wyomingites
  • † Wyomingites aplanatus – or unidentified comparable form

X

• † Xenoceltites
  • † Xenoceltites cordilleranus
  • † Xenoceltites subevolutus
• † Xiaoqiaoceras – tentative report
  • † Xiaoqiaoceras americanum – type locality for species

Y

• 

  † Yurgovuchia – type locality for genus
  • † Yurgovuchia doellingi – type locality for species

Z

• 

  † Zamites
  • † Zamites powelli
  • † Zamites tidwellii – type locality for species
• † Zygiocuspis – type locality for genus
  • † Zygiocuspis goldingi – type locality for species
• † Zygopleura
  • † Zygopleura haasi – type locality for species

References

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