Elk Creek (520 m) (Eocene of the United States)

Also known as YPM 52, USGS D-1438 (516 m), 1304 (519 m)

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 15547: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• not clear if USGS lists are in Schankler-Wing or Bown sections
possibly relevant: Absarokius abbotti Bown and Rose 1987: USGS D-1304, 1438 Absarokius metoecus Bown and Rose 1987: USGS D-1438
Mammalia
 Primates - Notharctidae
Cantius abditus Gingerich and Simons 1977 primate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri
"Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse
"H. sp. 1"
 Theriamorpha - Phenacodontidae
Phenacodus vortmani Cope 1880 condylarth
 Artiodactyla - Diacodexeidae
Diacodexis sp. Cope 1882 even-toed ungulate
 Creodonta - Oxyaenidae
Oxyaena sp. Cope 1874 creodont
"intermedia/forcipata"
 Theriamorpha - Viverravidae
Didymictis sp. Cope 1875 placental
"curtidens/lysitensis"
 Theriamorpha -
Vulpavus australis Matthew and Granger 1915 placental
 Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
"loomisi/minor"
 Cimolesta - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont