Elk Creek (650 m) (Eocene of the United States)

Also known as YPM 1, 2, 17, 161, USGS D-1566

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 15564: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• not clear if B & R 87 level for USGS D-1566 is in terms of the Schankler-Wing or Bown sections
Mammalia
 Cimolesta - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
"2"
 Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
"latidens/miticulus"
Hyopsodus sp. Leidy 1870 condylarth
"loomisi/minor"
Hyopsodus powellianus Cope 1884 condylarth
 Theriamorpha - Viverravidae
Viverravus sp. Marsh 1872 placental
"V. acutus/gracilis"
Didymictis sp. Cope 1875 placental
"curtidens/lysitensis"
 Theriamorpha -
Uintacyon asodes Gazin 1952 placental
 Theriamorpha - Phenacodontidae
Phenacodus vortmani Cope 1880 condylarth
 Perissodactyla - Equidae
"Hyracotherium pernix" = Arenahippus pernix
"Hyracotherium pernix" = Arenahippus pernix Marsh 1876 horse
"H. sp. 3"
 Perissodactyla -
Heptodon sp. Cope 1882 odd-toed ungulate
"1"
Heptodon posticus Cope 1882 odd-toed ungulate
Heptodon calciculus Cope 1880 odd-toed ungulate
 Artiodactyla - Diacodexeidae
"Bunophorus" macropternus Cope 1882 even-toed ungulate
Diacodexis sp.1 Cope 1882 even-toed ungulate
 Rodentia - Ischyromyidae
Paramys cf. copei Loomis 1907 rodent
Paramys cf. excavatus Loomis 1907 rodent
 Rodentia - Sciuravidae
cf. Knightomys minor1 Wood 1965 rodent
 Primates - Omomyidae
Absarokius metoecus2 Bown and Rose 1987 tarsier
Y-1
Absarokius abbotti Loomis 1906 tarsier
OK, B & R 87: Y-1, 2, 161, USGS D-1566
 Primates - Microsyopidae
Microsyopidae indet.1 Osborn and Wortman 1892 primate
 Primates - Notharctidae
Cantius sp.1 Simons 1962 primate