List of the Mesozoic life of Utah

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.

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
• †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
• †Moros intrepidus – type locality for species
• †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