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 Skull.png †[[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 Scale Chart Steveoc.svg †[[Alamosaurus]]
 * †Alamosaurus sanjuanensis
 * †Albanerpeton
 * †Albanerpeton cifellii – type locality for species
 * †Albanerpeton galaktion
 * †Albanerpeton gracilis
 * †Albanerpeton nexuosus
 * †Allocrioceras
 * †Allocrioceras annulatum
 * Allosaurus Revised.jpg †[[Allosaurus]]
 * †Allosaurus fragilis
 * †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.jpg †[[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
 * [[File:Araucarioxylon arizonicum (petrified wood) - National Museum of Natural History, United States - DSC08540.JPG|thumb|upright=0.74|Petrified trunk segments of the Permian-Late Triassic conifer tree [[Araucarioxylon arizonicum]]]] †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
 * AsteriacitesUtah.jpg [[Asteriacites]]
 * †Asteriacites lumbricalis
 * †Astralopteris
 * †Astralopteris coloradica
 * †Astroconodon
 * †Astroconodon delicatus – type locality for species
 * †Atreipus
 * †Atreipus milfordensis
 * †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 lentus1.jpg]] †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 cropped.png †[[Brachauchenius]]
 * †Brachauchenius lucasi
 * †Brachiosaurus
 * †Brachychirotherium
 * †Brachychirotherium thuringiacum
 * †Brachyphyllum
 * †Brachyphyllum crassicaule
 * †Brasilichnium
 * †Brontomerus – type locality for genus
 * †Brontomerus mcintoshi – type locality for species
 * †Brontopodus
 * Brontosaurus NT small.jpg †[[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
 * Camarasaurs1.jpg †[[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 nasicornis DB.jpg †[[Ceratosaurus]]
 * †Ceratosaurus nasicornis
 * †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 BW.jpg †[[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
 * Ptilodus.jpg †[[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 BW.jpg †[[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 fossil cropped.png †[[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
 * †Denazinemys
 * †Denazinemys nodosa
 * Dentalium
 * †Dentalium sublineatum – or unidentified related form
 * Diabloceratops NT.jpg †[[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 carnegii.jpg †[[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 altus
 * †Dystrophaeus – type locality for genus
 * †Dystrophaeus viaemalae – type locality for species

E

 * †Elegantinia
 * Elliptio
 * Enchodus petrosus cropped.png †[[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 cropped.png †[[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 costata Prairie Bluff Fm Maastrichtian.JPG †[[Exogyra]]
 * †Exogyra acroumbonata
 * †Exogyra levis
 * †Exostinus – or unidentified comparable form

F

 * †Fabrosaurus – tentative report
 * Falcarius.jpg †[[Falcarius]] – type locality for genus
 * †Falcarius utahensis – type locality for species
 * Ficus
 * †Ficus daphnogenoides
 * †Flemingites
 * †Frenelopsis
 * †Frenelopsis varians
 * †Frenelopsis variens

G

 * Gastoniasaur.jpg †[[Gastonia (dinosaur)|Gastonia]] – type locality for genus
 * †Gastonia burgei – 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 BW.jpg †[[Goniopholis]]
 * †Grallator
 * †Grallator cursorius
 * †Grammatodon
 * †Grammatodon haguei
 * †Gryphaea
 * †Gryphaea planoconvexa
 * †Gryphaeostrea
 * Gryposaurus Monumentsis Skull, Alf Museum.JPG †[[Gryposaurus]]
 * †Gryposaurus monumentensis – type locality for species
 * †Guodunites
 * †Guodunites hooveri
 * †Gwyneddichnium
 * †Gypsonictops

H

 * Hagryphus2.jpg †[[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 restoration.png †[[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 NT.jpg †[[Hybodus]]
 * †Hyporosopora
 * †Hyporosopora nielsoni – type locality for species

I

 * †Icacinoxylon
 * †Icacinoxylon pittiense – type locality for species
 * †Idahocolumbites
 * †Idahocolumbites cheneyi
 * Life restoration of Iguanacolossus.jpg †[[Iguanacolossus]] – type locality for genus
 * †Iguanacolossus fortis – type locality for species
 * †Iguanodon
 * †Iguanodon ottingeri – type locality for species
 * Ilex
 * †Ilex serrata
 * Inoceramus steenstrup, world's largest fossil mollusk.jpg †[[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
 * Pteriidae - Isognomon maxillatus.JPG [[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

 * Tetrarhynchiidae - Kallirhynchia major cropped.jpg †[[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 NT small.jpg †[[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
 * [[File:Leidyosuchus canadensis, Dinosaur Provincial Park, Alberta, Canada, Late Cretaceous - Royal Ontario Museum - DSC00090.JPG|thumb|upright|Fossilized skull of the Late Cretaceous alligator relative Leidyosuchus]] †[[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 by Tomopteryx.png †[[Lythronax]] – type locality for genus
 * †Lythronax argestes – type locality for species

M

 * Machairoceratops NT small.jpg †[[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 restoration.jpg †[[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 skull.jpg †[[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
 * Colored Fig 36 Moabo Skeleton.tif †[[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-1.jpg †[[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 skeleton.jpg †[[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
 * Nerineidae - Nerinea sp..JPG †[[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 graffami, Glen Canyon Dam Visitors' Center.JPG †[[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
 * Fighting Othnielia.jpg †[[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
 * [[File:Pagiophyllum sp. - Naturhistorisches Museum, Braunschweig, Germany - DSC05070 cropped.jpg|thumb|upright=0.659|Fossilized foliage of the Carboniferous-Late Cretaceous plant Pagiophyllum]] †[[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
 * GorgosaurusDB.jpg †[[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
 * Pholadomyidae - Pholadomya scutata.JPG [[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 meeki.jpg †[[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 gracilis (1).jpg †[[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 shell cropped.png †[[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 pulaskiensis Clayton.jpg [[Pycnodonte]]
 * †Pycnodonte newberryi

Q

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

R

 * †Radioceras
 * †Radioceras evolvens – or unidentified related form
 * Redondasaurus bermani at CMNH 04.jpg †[[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.png †[[Richardoestesia]]
 * †Richardoestesia isosceles – or unidentified comparable form
 * Rogerella
 * †Rotodactylus
 * †Rotodactylus cursorius – type locality for species

S

 * †Sabalites
 * †Sabalites NE008 – informal
 * Salix
 * †Salix newberryana
 * Sauropelta reconstruction.png †[[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
 * Skeletal reconstruction of Seitaad ruessi.jpg †[[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 reconstruction.png †[[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
 * Spheroolithidae cropped.jpg †[[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 stenops sophie wiki martyniuk.png †[[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 by Tom Parker.png †[[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.png]] †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 curriei.png †[[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
 * Museum AL dinosaur.jpg †[[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 ROM Dec29 07.png †[[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
 * Philmont Scout Ranch Tyrannosaurus footprint.jpg †[[Tyrannosauripus]] – type locality for genus
 * †Tyrannosauripus petersoni – type locality for species

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 scale.png †[[Utahraptor]] – type locality for genus
 * †Utahraptor ostrommaysi – type locality for species
 * †Uteodon
 * †Uteodon aphanoecetes

V

 * Valvata
 * Vancleavea.jpg †[[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 contectus met operculum2.JPG [[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.jpg †[[Yurgovuchia]] – type locality for genus
 * †Yurgovuchia doellingi – type locality for species

Z

 * Zamites mariposana.jpg †[[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