SC-255 (Eocene of the United States)

Where: Park County, Wyoming (44.3° N, 109.0° W: paleocoordinates 49.2° N, 91.9° W)

• coordinate based on political unit

• small collection-level geographic resolution

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

Environment/lithology: terrestrial

Reposited in the UMMP

Primary reference: L. D. Ivy. 1990. Systematics of Late Paleocene and Early Eocene Rodentia (Mammalia) from the Clarks Fork Basin, Wyoming. Contributions from the Museum of Paleontology, University of Michigan 28(2):21-70 [J. Alroy/J. Alroy/P. Mannion]more details

PaleoDB collection 15805: authorized by John Alroy, entered by John Alroy on 27.09.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• meter level based on Bown and Rose 1987: 1520 m added to their figure, which is from the base of the Willwood
Mammalia
 Condylarthra - Hyopsodontidae
Hyopsodus sp.1 Leidy 1870 condylarth
 Macroscelidea - Apheliscidae
Haplomylus scottianus5 Gingerich 1994 elephant shrew
 Perissodactyla - Equidae
"Hyracotherium pernix" = Arenahippus pernix4
"Hyracotherium pernix" = Arenahippus pernix4 Marsh 1876 horse
 Perissodactyla -
Homogalax protapirinus4 Wortman 1896 odd-toed ungulate
 Theriamorpha - Viverravidae
Viverravus acutus7 Matthew and Granger 1915 placental
Viverravus politus7 Matthew and Granger 1915 placental
Didymictis protenus7 Cope 1874 placental
 Theriamorpha -
Vulpavus cf. australis3 Matthew and Granger 1915 placental
Vassacyon promicrodon3 Wortman and Matthew 1899 placental
Miacis exiguus3 Matthew and Granger 1915 placental
 Rodentia - Sciuravidae
Knightomys cremneus Ivy 1990 rodent
 Primates - Omomyidae
Tetonius sp.2 Matthew 1915 tarsier
"matthewi-ambiguus"
Pseudotetonius ambiguus2 Matthew 1915 tarsier
 Primates - Microsyopidae
Microsyops angustidens6 Matthew 1915 primate