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Mammals

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Partially based on Grande (1984). Aside from the few well-preserved mammals found in Fossil Lake, a majority of Green River mammals are based on isolated bones and teeth:[1]

Metatheria

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Genus Species Member Abundance Notes Image
Herpetotherium H. innominatum Lake Gosiute, Lake Uinta, & Douglas Creek An opossum-like basal metatherian. Originally placed in Peratherium.
H. huntii, a related species
H. knighti Lake Gosiute
H. marsupium Douglas Creek
Peradectes P. chesteri Douglas Creek
Armintodelphys A. dawsoni Douglas Creek

Artiodactyla

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Genus Species Member Abundance Notes Image
Antiacodon A. pygmaeus Douglas Creek

Cimolesta

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Genus Species Member Abundance Notes Image
Coryphodon C. sp. Douglas Creek
Palaeosinopa P. didelphoides Fossil Lake A pantolestid.
Trogosus T. sp Douglas Creek
Undescribed Undescribed Fossil Butte

Chiroptera

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

Eulipotyphla

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

Pan-Carnivora

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Genus Species Member Abundance Notes Image
"Miacis" "M." gracilis Lake Uinta A carnivoraform of uncertain affinities.
Sinopa S. minor Lake Uinta A sinopid hyaenodont.
S. rapax, a related species
Viverravus V. minutus Lake Uinta A viverravid.
Vulpavus V. profectus Lake Gosiute A miacid.

Pan-Perissodactyla

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Genus Species Member Abundance Notes Image
Helaletes H. nanus Douglas Creek
Hyopsodus H. minusculus Lake Gosiute & Lake Uinta A hyopsodontid.
H. paulus (=H. vicarius) Lake Uinta
H. wortmani Fossil Lake
Hyrachyus H. modestus Douglas Creek
Hyracotherium H. vasacciense Douglas Creek
Isectolophus I. sp. cf. l. latidens Douglas Creek
Lambdotherium L. popoagicum Fossil Lake A small-sized basal brontothere.
Protorohippus P. venticolus 2 skeletons. An equid.
Tapiromorpha indet. 1 skeleton A juvenile tapiromorph, the largest mammal specimen known from the formation. Initially identified as a Heptodon calciculus.[3]

Apatotheria

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Genus Species Member Abundance Notes Image
Apatemys 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

Rodentia

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Genus Species Member Abundance Notes Image
Paramys P. sp. Lake Uinta A ischyromyid rodent.
P. delicatus
Sciuravus S. eucristadens Lake Uinta A sciuravid rodent. Originally identified as Viverravus eucristadens.
S. sp.
Thisbemys T. sp. Lake Gosiute A ischyromyid rodent.
T. plicatus

Primatomorpha

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Genus Species Member Abundance Notes Image
Microsyops M. elegans Lake Gosiute A microsyopid stem-primate.
M. cardiorestes, a related species
Notharctus N. sp. Lake Gosiute A notharctid adapiform.
N. tenebrosus
Omomys O. carteri (=O. pucillus)[4] Lake Uinta An omomyid primate.
Smilodectes S. gracilis Lake Uinta A notharctid adapiform. Formerly placed in Notharctus matthewi.
Tetonius T. sp. Lake Uinta An omomyid primate.
T. homunculus
Uintasorex U. parvulus Lake Gosiute A microsyopid stem-primate.
Washakius W. insignis Lake Gosiute An omomyid primate.
  1. ^ Cite error: The named reference :3 was invoked but never defined (see the help page).
  2. ^ 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.
  3. ^ "Wyoming State Geological Survey - Tapiromorph Fossil". main.wsgs.wyo.gov. Retrieved 2024-09-04.
  4. ^ 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.