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
Fossilized skull of the Late Cretaceous duck-billed dinosaur Acristavus
†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
Diagram illustrating the sizes of three specimens of the Late Cretaceous long-necked dinosaur Alamosaurus, with an anachronistic human to scale
†Alamosaurus
- †Alamosaurus sanjuanensis
†Albanerpeton
- †Albanerpeton cifellii – type locality for species
- †Albanerpeton galaktion
- †Albanerpeton gracilis
- †Albanerpeton nexuosus
†Allocrioceras
- †Allocrioceras annulatum
Life restoration of the Late Jurassic theropod dinosaur Allosaurus
†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
Mounted fossilized skeleton of the Cretaceous armored dinosaur Animantarx
†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
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
Fossil of the Ordovician-Modern sea star trace fossil ichnogenus Asteriacites
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
Life reconstruction of an individual rearing up to defend itself against a pair of Allosaurus
†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
Life restoration of the Late Cretaceous plesiosaur Brachauchenius hunting a hesperornithiform bird
†Brachauchenius
- †Brachauchenius lucasi
†Brachiosaurus
†Brachychirotherium
- †Brachychirotherium thuringiacum
†Brachyphyllum
- †Brachyphyllum crassicaule
†Brasilichnium
†Brontomerus – type locality for genus
- †Brontomerus mcintoshi – type locality for species
†Brontopodus
Life restoration of a herd of the Late Jurassic sauropod dinosaur Brontosaurus
†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
Life restoration of a herd of the Late Jurassic sauropod dinosaur Camarasaurus
†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
Restoration of the Late Jurassic ceratosaur Ceratosaurus
†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
Restoration of the Late Triassic coelacanth fish Chinlea
†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
Life restoration of the face of the Late Cretaceous multituberculate mammal Cimolomys
†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
Life restoration of the Late Jurassic primmitive tyrannosaur Coelurus
†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
Fossil of the Jurassic-Cretaceous cycad relative Cycadeoidea
†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
Restoration of the Late Cretaceous horned dinosaur Diabloceratops
†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
Life restoration of the Late Jurassic long-necked dinosaur Diplodocus
†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
Restoration of the Early Cretaceous-Eocene bony fish Enchodus, or the "saber-toothed herring"
†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
Illustration of a reconstructed skull and restorative portrait of the Late Cretaceous primitive duck-billed dinosaur Eolambia
†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
Fossilized shell of the Jurassic-Cretaceous foam oyster Exogyra
†Exogyra
- †Exogyra acroumbonata
- †Exogyra levis
†Exostinus – or unidentified comparable form

F

†Fabrosaurus – tentative report
Fossilized skeleton of the Early Cretaceous therizinossaur Falcarius
†Falcarius – type locality for genus
- †Falcarius utahensis – type locality for species
Ficus
- †Ficus daphnogenoides
†Flemingites
†Frenelopsis
- †Frenelopsis varians
- †Frenelopsis variens

G

Mounted fossilized skeletons of the Early Cretaceous armored dinosaur Gastonia
†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
Restoration of the Late Jurassic-Early Cretaceous crocodile relative Goniopholis
†Goniopholis
†Grallator
- †Grallator cursorius
†Grammatodon
- †Grammatodon haguei
†Gryphaea
- †Gryphaea planoconvexa
†Gryphaeostrea
Mounted fossilized skeleton of the Late Cretaceous duck-billed dinosaur Gryposaurus
†Gryposaurus
- †Gryposaurus monumentensis – type locality for species
†Guodunites
- †Guodunites hooveri
†Gwyneddichnium
†Gypsonictops

H

Life restoration of the Late Cretaceous oviraptorosaur Hagryphus
†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
Life restoration of the Early Cretaceous Iguanodon relative Hippodraco
†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
Restoration of two of the Permian-Late Cretaceous cartilaginous fish Hybodus
†Hybodus
†Hyporosopora
- †Hyporosopora nielsoni – type locality for species

I

†Icacinoxylon
- †Icacinoxylon pittiense – type locality for species
†Idahocolumbites
- †Idahocolumbites cheneyi
Life restoration of the Early Cretaceous Iguanodon relative Iguanacolossus
†Iguanacolossus – type locality for genus
- †Iguanacolossus fortis – type locality for species
†Iguanodon
- †Iguanodon ottingeri – type locality for species
Ilex
- †Ilex serrata
Fossilized shell of the Early Jurassic-Late Cretaceous marine bivalve Inoceramus with a human indicating its size
†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
Fossilized shell of the Permian-modern marine bivalve Isognomon
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

Fossilized shells of the Jurassic brachiopod Kallirhynchia
†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
Life restoration of the Late Cretaceous horned dinosaur Kosmoceratops
†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
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
Life restoration of the Late Cretaceous tyrannosaur Lythronax
†Lythronax – type locality for genus
- †Lythronax argestes – type locality for species

M

Life restoration of the Late Cretaceous horned dinosaur Machairoceratops
†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
Life restoration of the Late Jurassic megalosaur Marshosaurus
†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
Fossilized skull of the Late Cretaceous multituberculate mammal Meniscoessus
†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
Mounted fossilized skeletons of the Early Cretaceous long-necked dinosaur Moabosaurus
†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
Fossilized shell of the Jurassic-Cretaceous marine bivalve Myophorella
†Myophorella
- †Myophorella livinigstonensis
- †Myophorella monatanaensis
- †Myophorella yellowstonensis
†Myophoria
†Mytiloides
- †Mytiloides submytiloides – or unidentified related form
†Mytilus
- †Mytilus whitei – or unidentified comparable form

N

†Naomichelys
Known material diagram of the Late Cretaceous horned dinosaur Nasutoceratops
†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
Fossilized shell of the Jurassic-Cretaceous sea snail Nerinea
†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
Mounted fossilized skeleton of the Late Cretaceous Nothronychus
†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
Mounted fossilized skeleton of the Late Jurassic herbivorous dinosaur Othnielosaurus
†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
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
Life restoration of the Late Cretaceous duck-billed dinosaur Parasaurolophus being preyed upon by the tyrannosaur Teratophoneus
†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
Fossilized shell of the Early Triassic-Pliocene marine bivalve Pholadomya
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
Fossilized shell of the Late Cretaceous ammonoid cephalopod Placenticeras
†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
Restoration of the Late Triassic crocodile relative Poposaurus with an anachronistic human to scale
†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
Fossilized shell of a Pseudomelania sea snail
†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
Assemblage of fossilized shells of the Cretaceous-Pleistocene oyster Pycnodonte
Pycnodonte
- †Pycnodonte newberryi

Q

†Quenstedtia
- †Quenstedtia bathonica – or unidentified related form

R

†Radioceras
- †Radioceras evolvens – or unidentified related form
Fossilized skeleton of the Late Triassic phytosaur Redondasaurus
†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
Micrograph with magnified inset of a fossilized tooth of the Late Cretaceous theropod dinosaur Richardoestesia
†Richardoestesia
- †Richardoestesia isosceles – or unidentified comparable form
Rogerella
†Rotodactylus
- †Rotodactylus cursorius – type locality for species

S

†Sabalites
- †Sabalites NE008 – informal
Salix
- †Salix newberryana
Life restoration of the Early Cretaceous armored dinosaurs Sauropelta
†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
Known material diagram of the Early Jurassic primitive long-necked dinosaur Seitaad
†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
Life restoration of the Late Cretaceous theropod dinosaur Siats
†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
Fossils of the dinosaur egg oogenus Spheroolithus
†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
Restoration of the Late Jurassic stegosaur Stegosaurus
†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
Life restoration of the primitive tyrannosaur Stokesosaurus
†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

Known material diagram of the Late Cretaceous troodontid Talos
†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
Known material diagram of the Late Cretaceous tyrannosaur Teratophoneus
†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
Mounted fossilized skeleton of the Late Jurassic megalosaur Torvosaurus
†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
Fossilized skeleton of the Late Cretaceous polycotylid plesiosaur Trinacromerum
†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
Fossil of the Late Cretaceous tyrannosaur footprint ichnogenus Tyrannosauripus
†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
Diagram illustrating the Early Cretaceous dromaeosaurid ("raptor") Utahraptor with an anachronistic human to scale
†Utahraptor – type locality for genus
- †Utahraptor ostrommaysi – type locality for species
†Uteodon
- †Uteodon aphanoecetes

V

Valvata
Life restoration of the Late Triassic reptile Vancleavea
†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
Shell of a Viviparus freshwater snail
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

Life restoration of the Early Cretaceous dromaeosaurid ("raptor") Yurgovuchia
†Yurgovuchia – type locality for genus
- †Yurgovuchia doellingi – type locality for species

Z

Fossil of the Early Triassic-Eocene cycad-like frond Zamites
†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

^ Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.
^ Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.

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

[1] Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.

[2] Lindsay E. Zanno; Ryan T. Tucker; Aurore Canoville; Haviv M. Avrahami; Terry A. Gates; Peter J. Makovicky (2019). "Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record". Communications Biology. 2: Article number 64. doi:10.1038/s42003-019-0308-7. PMC 6385174. PMID 30820466.

[1]

[2]