Elk Creek (630 m) (Eocene of the United States)

Also known as YPM 9, 10, 22, 188, 187

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. University of Michigan Papers on Paleontology 24 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 15560: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• tuff at 634 m dated at 52.8 +/- 0.3 Ma (Ar-Ar) by Wing et al. 1991
YPM 187 and 188 are in Washakie County, the others are in Big Horn County
Mammalia
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
"2"
 Primates - Microsyopidae
Microsyopidae indet.1 Osborn and Wortman 1892 primate
 Primates - Omomyidae
Absarokius abbotti2 Loomis 1906 tarsier
Y-187
 Primates - Notharctidae
Cantius abditus1 Gingerich and Simons 1977 primate
 Primates - Paromomyidae
Phenacolemurinae indet. Simpson 1955 primate
"Phenacolemur sp. 2"
 Rodentia - Ischyromyidae
Paramys cf. excavatus Loomis 1907 rodent
Paramys cf. copei Loomis 1907 rodent
 Perissodactyla -
Heptodon calciculus Cope 1880 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri
"Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse
"H. sp. 1"
 Ferae - Viverravidae
Didymictis sp. Cope 1875 placental
"curtidens/lysitensis"
 Ferae -
Uintacyon asodes Gazin 1952 placental
 Carnivora -
Vulpavus australis Matthew and Granger 1915 carnivoran
Vulpavus canavus Cope 1881 carnivoran
 Tillodontia - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
 Ungulata - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
"latidens/miticulus"
Hyopsodus sp. Leidy 1870 condylarth
"loomisi/minor"
Hyopsodus powellianus Cope 1884 condylarth
 Ungulata - Diacodexeidae
"Bunophorus" macropternus Cope 1882 even-toed ungulate
Diacodexis sp.1 Cope 1882 even-toed ungulate
 Hyaenodonta - Hyaenodontidae
Prototomus sp. Cope 1874 eutherian
"1"
Tritemnodon strenuus1 Cope 1875 eutherian
 Hyaenodonta -
Didelphodus absarokae Cope 1881 eutherian