SC-54 (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: K. D. Rose. 1981. The Clarkforkian Land-Mammal Age and Mammalian Faunal Composition Across the Paleocene-Eocene Boundary. University of Michigan Papers on Paleontology 26:1-197 [J. Alroy/J. Alroy/P. Mannion]more details

PaleoDB collection 15756: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• meter level given by Gunnell and Gingerich 1991
Mammalia
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
 Primates - Microsyopidae
Arctodontomys wilsoni6 Szalay 1969 primate
 Primates - Omomyidae
Teilhardina sp.2 Simpson 1940 tarsier
T. crassidens-americana intergrade
 Primates - Adapidae
Adapidae indet.1 Trouessart 1879 primate
 Primates - Paromomyidae
Phenacolemurinae indet.1 Simpson 1955 primate
Ignacius graybullianus Bown and Rose 1976 primate
 Rodentia - Ischyromyidae
Paramys sp. Leidy 1871 rodent
 Perissodactyla -
Cardiolophus radinskyi3 Gingerich 1991 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri3
"Hyracotherium grangeri" = Sifrhippus grangeri3 Gingerich 1989 horse
 Creodonta - Oxyaenidae
Palaeonictis occidentalis7 Osborn 1892 creodont
Dipsalidictis transiens7 Matthew and Granger 1915 creodont
 Ferae - Viverravidae
Didymictis protenus Cope 1874 placental
confirmed by Polly 1997
Didymictis leptomylus9 Cope 1880 placental
Viverravus acutus Matthew and Granger 1915 placental
confirmed by Polly 1997
 Ferae -
Uintacyon cf. massetericus Cope 1882 placental
 Carnivora - Miacidae
Miacis sp.1 Cope 1872 carnivoran
 Macroscelidea - Apheliscidae
Haplomylus speirianus Cope 1880 elephant shrew
Apheliscus chydaeus4 Gingerich 1994 elephant shrew
 Tillodontia - Esthonychidae
Esthonyx spatularius Cope 1880 tillodont
 Tribosphenida - Arctocyonidae
Thryptacodon antiquus Matthew and Granger 1915 condylarth
 Ungulata - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
 Ungulata - Diacodexeidae
Diacodexis sp.1 Cope 1882 even-toed ungulate
 Ungulata - Phenacodontidae
Ectocion osbornianus Cope 1882 condylarth
described by Thewissen 1990
Phenacodus sp.1 Cope 1873 condylarth
 Insectivora - Apatemyidae
Apatemyidae indet.1 Matthew 1909 insectivoran
 Acreodi - Mesonychidae
Pachyaena sp. Cope 1874 condylarth
 Hyaenodonta -
Prolimnocyon haematus n. sp.5 Gingerich and Deutsch 1989 eutherian
 Hyaenodonta - Hyaenodontidae
Prototomus martis5 Gingerich and Deutsch 1989 eutherian
Arfia shoshoniensis5 Matthew and Granger 1915 eutherian
 Hyaenodonta -
Didelphodus absarokae Cope 1881 eutherian
 Multituberculata -
Neoliotomus ultimus8 Granger and Simpson 1928 multituberculate