MP-260 (Eocene of the United States)

Where: Wyoming (44.7° N, 108.7° W: paleocoordinates 49.5° N, 91.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Wa-1

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; lithified siliciclastic sediments

Size classes: macrofossils, mesofossils

Reposited in the UMMP

Collection methods: surface (float), surface (in situ),

Primary reference: W. C. Clyde. 1997. Stratigraphy and mammalian paleontology of the McCullough Peaks, northern Bighorn Basin, Wyoming: Implications for biochronology, basin development, and community reorganization across the Paleocene-Eocene boundary. PhD Thesis, University of Michigan [W. Clyde/W. Clyde/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 46823: authorized by Will Clyde, entered by Will Clyde on 24.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Placentalia -
Rodentia indet. Bowdich 1821 rodent
 Primates - Microsyopidae
"Haplomylus speirianus" = Microsyops speirianus
"Haplomylus speirianus" = Microsyops speirianus Cope 1880 primate
 Primates - Notharctidae
Cantius ralstoni Matthew 1915 primate
 Primates - Paromomyidae
Ignacius graybullianus Bown and Rose 1976 primate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri
"Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse
 Theriamorpha - Phenacodontidae
Ectocion osbornianus Cope 1882 condylarth
 Procreodi - Arctocyonidae
Thryptacodon antiquus Matthew and Granger 1915 condylarth
 Creodonta - Hyaenodontidae
Arfia zele Gingerich and Deutsch 1989 creodont
 Condylarthra - Hyopsodontidae
Hyopsodus loomisi McKenna 1960 condylarth
 Cimolesta - Esthonychidae
Esthonyx spatularius Cope 1880 tillodont