Elk Creek (90 m) (Eocene of the United States)

Also known as YPM 90a

Where: Big Horn County, Wyoming (44.5° N, 108.0° W: paleocoordinates 49.2° N, 90.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Willwood Formation, Wasatchian (55.8 - 50.3 Ma)

Environment/lithology: terrestrial

Primary reference: D. M. Schankler. 1980. Faunal Zonation of the Willwood Formation in the Central Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology 24:99-114 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 15505: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Theriamorpha - Leptictidae
Prodiacodon tauricinerei Jepsen 1930 eutherian
 Rodentia - Ischyromyidae
Paramys cf. copei Loomis 1907 rodent
Paramys cf. excavatus Loomis 1907 rodent
 Rodentia - Sciuravidae
cf. Knightomys minor Wood 1965 rodent
 Primates - Microsyopidae
"Haplomylus speirianus" = Microsyops speirianus
"Haplomylus speirianus" = Microsyops speirianus Cope 1880 primate
 Primates - Notharctidae
Cantius sp. Simons 1962 primate
 Primates - Paromomyidae
Phenacolemurinae indet. Simpson 1955 primate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri
"Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse
"H. sp. 1"
 Theriamorpha - Phenacodontidae
Ectocion osbornianus Cope 1882 condylarth
Phenacodus vortmani Cope 1880 condylarth
Phenacodus intermedius Granger 1915 condylarth
 Artiodactyla - Diacodexeidae
Diacodexis sp. Cope 1882 even-toed ungulate
 Creodonta - Oxyaenidae
Oxyaena gulo Matthew and Granger 1915 creodont
 Creodonta - Hyaenodontidae
Prototomus sp. Cope 1874 creodont
"1"
Arfia sp. Van Valen 1965 creodont
 Theriamorpha - Viverravidae
Didymictis leptomylus Cope 1880 placental
Viverravus sp. Marsh 1872 placental
"2"
 Theriamorpha -
Oodectes sp. Wortman 1901 placental
 Acreodi - Mesonychidae
Pachyaena ossifraga Cope 1874 condylarth
 Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
"loomisi/minor"
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
"2"
 Cimolesta - Esthonychidae
Esthonyx spatularius Cope 1880 tillodont