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Reptiles

Squamates

Genus	Species	Member	Notes
Afairiguana	A. avius	Fossil Lake	A stem-anole.^[1]
Bahndwivici	B. ammoskius		A relative of the Chinese crocodile lizard.
Boavus	B. idelmani		A boa.
Dunnophis	D. sp.		Possibly a dwarf boa.^[2]
Glyptosaurus	G. sylvestris
Parasauromalus	P. olseni
Saniwa	S. ensidens		A stem-monitor lizard.
Shinisauridae indet.		Lake Uinta (Parachute Creek)	A relative of the Chinese crocodile lizard, unusually preserved with a mineralized body without a skeleton.^[3]
Xestops	X. sp. cf. vagans

Crocodilians

Genus	Species	Member	Notes
Allognathosuchus	A. sp
Boverisuchus	B. vorax
"Crocodilus"	"C." acer
"Crocodilus"	"C." affinis
"Diplocynodon"	"D." sp
Borealosuchus	B. wilsoni	Fossil Lake	A eusuchian of uncertain affinities.
Tsoabichi	T. greenriverensis	Fossil Lake	A caiman.^[4]

Turtles

Genus	Species	Member	Notes
Axestemys	A. sp.	Fossil Lake	A softshell turtle.
Baptemys	B. wyomingensis		A dermatemydid.
Chisternon	C. undatum		A baenid.
Echmatemys	E. wyomingensis		A geoemydid.^[5]
Oliveremys	O. uintaensis		A softshell turtle.
Plastomenus	P. thomasii		A softshell turtle.

Mammals

Metatheria

Genus	Species	Member	Notes
Herpetotherium^[6]	H. innominatum	Lake Gosiute, Lake Uinta, & Douglas Creek	An opossum-like basal metatherian. Originally placed in Peratherium.
	H. knighti	Lake Gosiute
	H. marsupium	Douglas Creek
Peradectes^[6]	P. chesteri	Douglas Creek
Armintodelphys ^[6]	A. dawsoni	Douglas Creek

Apatotheria

Genus	Species	Member
Apatemys^[6]	A. sp., cf. A. bellus	Douglas Creek
	A. sp., cf. A. bellulus	Douglas Creek
	A. chardini	Fossil Lake & Douglas Creek
	A. sp., cf. A. rodens	Douglas Creek

Artiodactyla

Genus	Species	Member	Abundance	Notes	Image
Antiacodon ^[6]	A. pygmaeus	Douglas Creek

Cimolesta

Genus	Species	Member	Abundance	Notes	Image
Palaeosinopa	P. didelphoides	Fossil Lake		A pantolestid.
Undescribed	Undescribed	Fossil Butte

Chiroptera

Genus	Species	Member	Abundance	Notes
Ageina^[6]	Cf. A. sp.	Douglas Creek
Icaronycteris	I. gunnelli	Fossil Lake	2 skeletons.^[7]	An icaronycterid bat.
Icaronycteris	I. index			An icaronycterid bat.
Onychonycteris	O. finneyi			An onychonycterid bat.

Eulipotyphla

Genus	Species	Member	Notes
Centetodon	C. pulcher
Centetodon	C. bembicophagus
Nyctitherium^[6]	N. nitidum	Lake Gosiute	A nyctitheriid. Originally identified as Talpavus nitidus.
	N. priscum	Douglas Creek
	N. serotinum	Douglas Creek
	N. sp.	Lake Uinta
Scenopagus^[6]	S. edenensis	Douglas Creek

Mesonychia

Genus	Species	Member	Abundance	Notes	Image
Mesonyx^[6]	M. sp	Douglas Creek

Palaeanodonta

Genus	Species	Member	Abundance	Notes	Image
Metacheiromys	M. sp
Tetrapassalus	T. sp

Pan-Carnivora

Genus	Species	Member	Notes
Gazinocyon^[6]	G. sp., cf. whitiae	Douglas Creek	Ordinally described as a species of Tritemnodon
Limnocyon^[6]	L. sp., cf. L.verus	Douglas Creek
Miacis^[6]	"M." gracilis	Lake Uinta	A carnivoraform of uncertain affinities.
Miacis^[6]	M. sp., cf. M. parvivorus	Douglas Creek	A carnivoraform of uncertain affinities.
Miocyon^[6]	M. sp., cf. M. major	Douglas Creek	Ordinally identified as Uintacyon
Oodectes^[6]	?O. sp.	Douglas Creek
Patriofelis^[6]	P. sp	Douglas Creek
Sinopa^[6]	S. grangeri	Douglas Creek	A sinopid hyaenodont.
Sinopa^[6]	S. minor	Lake Uinta	A sinopid hyaenodont.
Viverravus^[6]	V. minutus	Lake Uinta	A viverravid.
	V. gracilis	Douglas Creek
	V. sicarius	Douglas Creek
Vulpavus	V. profectus	Lake Gosiute	A miacid.

Pan-Perissodactyla

Genus	Species	Member	Abundance	Notes
Helaletes^[6]	H. nanus	Douglas Creek
Hyopsodus	H. minusculus	Lake Gosiute & Lake Uinta		A hyopsodontid.
	H. paulus (=H. vicarius)	Lake Uinta
	H. wortmani	Fossil Lake
Hyrachyus ^[6]	H. modestus	Douglas Creek
Hyracotherium^[6]	H. vasacciense	Douglas Creek
Isectolophus^[6]	I. sp. cf. l. latidens	Douglas Creek
Lambdotherium	L. popoagicum	Fossil Lake		A small-sized basal brontothere.
Meniscotherium^[6]	M. sp	Douglas Creek
Orohippus^[8]	O sp. cf. O. pumilus
Phenacodus	P. wartmani
Protorohippus	P. venticolus	Fossil Lake	2 skeletons.	An equid.
Tapiromorpha indet.		Fossil Lake	1 skeleton	A juvenile tapiromorph, the largest mammal specimen known from the formation. Initially identified as a Heptodon calciculus.^[9]

Pantodonta

Genus	Species	Member	Abundance	Notes	Image
Coryphodon ^[6]	C. sp.	Douglas Creek

Primatomorpha

Genus	Species	Member	Notes
Anaptomorphus^[6]	A. aemulus	Douglas Creek
Microsyops^[6]	M. elegans	Lake Gosiute	A microsyopid stem-primate.
Microsyops^[6]	M. microsyops	Douglas Creek	Originally identified as Cynodontomys scottianus
Notharctus^[6]	N. sp.	Lake Gosiute	A notharctid adapiform.
Notharctus^[6]	N sp., cf. N. tenebrosus	Douglas Creek	A notharctid adapiform.
Omomys^[6]	O. carteri (=O. pucillus)^[10]	Lake Uinta	An omomyid primate.
Omomys^[6]	O. lloydi	Douglas Creek	An omomyid primate.
Smilodectes	S. gracilis	Lake Uinta	A notharctid adapiform. Formerly placed in Notharctus matthewi.
Tetonius	T. sp.	Lake Uinta	An omomyid primate.
Uintanius^[6]	U. ameghini	Douglas Creek
Uintasorex	U. parvulus	Lake Gosiute	A microsyopid stem-primate.
Utahia^[6]	U. kayi	Douglas Creek
Washakius	W. insignis	Lake Gosiute	An omomyid primate.

Rodentia

Genus	Species	Member	Notes	Image
Microparamys^[6]	M. minutus	Douglas Creek
Paramys	P. sp.	Lake Uinta	A ischyromyid rodent.	P. delicatus
Pauromys	P. sp
Sciuravus	S. eucristadens	Lake Uinta	A sciuravid rodent. Originally identified as Viverravus eucristadens.
Sciuravus	S. sp.	Lake Uinta
Thisbemys	T. sp.	Lake Gosiute	A ischyromyid rodent.	T. plicatus

Tillodontia

Genus	Species	Member	Abundance	Notes	Image
Trogosus^[6]	T. sp	Douglas Creek

^ Scarpetta, Simon G. (2024). "A Palaeogene stem crotaphytid ( Aciprion formosum ) and the phylogenetic affinities of early fossil pleurodontan iguanians". Royal Society Open Science. 11 (1). Bibcode:2024RSOS...1121139S. doi:10.1098/rsos.221139. ISSN 2054-5703. PMC 10776235. PMID 38204790.
^ "PBDB Taxon". paleobiodb.org. Retrieved 2024-08-17.
^ Carpenter, Kenneth (2018-10-18). "Soft-bodied fossil of a lizard from the Parachute Creek Member, Green River Formation (Eocene), Utah". Geology of the Intermountain West. 5: 263–269. doi:10.31711/giw.v5.pp263-269. ISSN 2380-7601.
^ Brochu, Christopher A. (2010-07-14). "A new alligatorid from the lower Eocene Green River Formation of Wyoming and the origin of caimans". Journal of Vertebrate Paleontology. 30 (4): 1109–1126. Bibcode:2010JVPal..30.1109B. doi:10.1080/02724634.2010.483569. ISSN 0272-4634.
^ Vlachos, Evangelos (2020-07-17). "The turtles from 'Gilmore's slab': evolution and diversity of the extinct turtle Echmatemys (Testudines: Testudinoidea: Geoemydidae) from the central United States". Journal of Systematic Palaeontology. 18 (14): 1193–1216. Bibcode:2020JSPal..18.1193V. doi:10.1080/14772019.2020.1754938. ISSN 1477-2019.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae Zonneveld, John-Paul; Gunnell, Gregg F.; Bartels, William S. (2000-06-27). "Early Eocene fossil vertebrates from the southwestern Green River Basin, Lincoln and Uinta counties, Wyoming". Journal of Vertebrate Paleontology. 20 (2): 369–386. doi:10.1671/0272-4634(2000)020[0369:eefvft]2.0.co;2. ISSN 0272-4634.
^ Rietbergen, Tim B.; Ostende, Lars W. van den Hoek; Aase, Arvid; Jones, Matthew F.; Medeiros, Edward D.; Simmons, Nancy B. (2023-04-12). "The oldest known bat skeletons and their implications for Eocene chiropteran diversification". PLOS ONE. 18 (4): e0283505. Bibcode:2023PLoSO..1883505R. doi:10.1371/journal.pone.0283505. ISSN 1932-6203. PMC 10096270. PMID 37043445.
^ Zonneveld, John-Paul; Gunnell, Gregg F.; Bartels, William S. (2000-06-27). "Early Eocene fossil vertebrates from the southwestern Green River Basin, Lincoln and Uinta counties, Wyoming". Journal of Vertebrate Paleontology. 20 (2): 369–386. doi:10.1671/0272-4634(2000)020[0369:eefvft]2.0.co;2. ISSN 0272-4634.
^ "Wyoming State Geological Survey - Tapiromorph Fossil". main.wsgs.wyo.gov. Retrieved 2024-09-04.
^ Burger, Benjamin John (2010-06-21). "Paleontological Contributions no. 2: Skull of the Eocene primate Omomys carteri from western North America". Paleontological Contributions (2). doi:10.17161/PC.1808.6360. ISSN 1946-0279.

[1] Scarpetta, Simon G. (2024). "A Palaeogene stem crotaphytid ( Aciprion formosum ) and the phylogenetic affinities of early fossil pleurodontan iguanians". Royal Society Open Science. 11 (1). Bibcode:2024RSOS...1121139S. doi:10.1098/rsos.221139. ISSN 2054-5703. PMC 10776235. PMID 38204790.

[2] "PBDB Taxon". paleobiodb.org. Retrieved 2024-08-17.

[3] Carpenter, Kenneth (2018-10-18). "Soft-bodied fossil of a lizard from the Parachute Creek Member, Green River Formation (Eocene), Utah". Geology of the Intermountain West. 5: 263–269. doi:10.31711/giw.v5.pp263-269. ISSN 2380-7601.

[4] Brochu, Christopher A. (2010-07-14). "A new alligatorid from the lower Eocene Green River Formation of Wyoming and the origin of caimans". Journal of Vertebrate Paleontology. 30 (4): 1109–1126. Bibcode:2010JVPal..30.1109B. doi:10.1080/02724634.2010.483569. ISSN 0272-4634.

[5] Vlachos, Evangelos (2020-07-17). "The turtles from 'Gilmore's slab': evolution and diversity of the extinct turtle Echmatemys (Testudines: Testudinoidea: Geoemydidae) from the central United States". Journal of Systematic Palaeontology. 18 (14): 1193–1216. Bibcode:2020JSPal..18.1193V. doi:10.1080/14772019.2020.1754938. ISSN 1477-2019.

[:0-6] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z ^aa ^ab ^ac ^ad ^ae Zonneveld, John-Paul; Gunnell, Gregg F.; Bartels, William S. (2000-06-27). "Early Eocene fossil vertebrates from the southwestern Green River Basin, Lincoln and Uinta counties, Wyoming". Journal of Vertebrate Paleontology. 20 (2): 369–386. doi:10.1671/0272-4634(2000)020[0369:eefvft]2.0.co;2. ISSN 0272-4634.

[7] Rietbergen, Tim B.; Ostende, Lars W. van den Hoek; Aase, Arvid; Jones, Matthew F.; Medeiros, Edward D.; Simmons, Nancy B. (2023-04-12). "The oldest known bat skeletons and their implications for Eocene chiropteran diversification". PLOS ONE. 18 (4): e0283505. Bibcode:2023PLoSO..1883505R. doi:10.1371/journal.pone.0283505. ISSN 1932-6203. PMC 10096270. PMID 37043445.

[8] Zonneveld, John-Paul; Gunnell, Gregg F.; Bartels, William S. (2000-06-27). "Early Eocene fossil vertebrates from the southwestern Green River Basin, Lincoln and Uinta counties, Wyoming". Journal of Vertebrate Paleontology. 20 (2): 369–386. doi:10.1671/0272-4634(2000)020[0369:eefvft]2.0.co;2. ISSN 0272-4634.

[9] "Wyoming State Geological Survey - Tapiromorph Fossil". main.wsgs.wyo.gov. Retrieved 2024-09-04.

[10] Burger, Benjamin John (2010-06-21). "Paleontological Contributions no. 2: Skull of the Eocene primate Omomys carteri from western North America". Paleontological Contributions (2). doi:10.17161/PC.1808.6360. ISSN 1946-0279.

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