West of Horse Creek (Eocene of the United States)

Also known as Keefer Collection 2

Where: Fremont County, Wyoming (43.2° N, 108.2° W: paleocoordinates 48.0° N, 91.4° W)

• coordinate based on political unit

When: basal Member (Lower Variegated Sequence Formation), Wasatchian (55.8 - 50.3 Ma)

Environment/lithology: terrestrial

Primary reference: W. R. Keefer. 1957. Geology of the Du Noir area, Fremont County, Wyoming. United States Geological Survey Professional Paper 294-E:155-221 [J. Alroy/J. Alroy/J. Ju]more details

PaleoDB collection 16075: authorized by John Alroy, entered by John Alroy on 30.04.1994

Creative Commons license: CC BY (attribution)

Taxonomic list

• N 1/2 sec 29 T 42N R 107W
Show authors, comments, and common names
Mammalia
 Cimolesta - Esthonychidae
Esthonyx sp.
Esthonyx sp. Cope 1874 tillodont
 Theriamorpha - Phenacodontidae
Ectocion sp., Phenacodus sp.
Ectocion sp. Cope 1882 condylarth
Phenacodus sp. Cope 1873 condylarth
 Perissodactyla - Brontotheriidae
Lambdotherium sp.
Lambdotherium sp. Cope 1880 brontothere
 Perissodactyla - Palaeotheriidae
Hyracotherium cf. vasacciense
Hyracotherium cf. vasacciense Cope 1872 odd-toed ungulate
 Artiodactyla - Dichobunidae
Dichobunidae indet.
Dichobunidae indet. Gill 1872 even-toed ungulate
"Diacodexis"