MP-283 (Eocene of the United States)

Where: Wyoming (44.7° N, 108.8° W: paleocoordinates 49.5° N, 91.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Wa-3

• 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 46844: authorized by Will Clyde, entered by Will Clyde on 24.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Squamata -
Mammalia
 Cimolesta - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
 Cimolesta - Coryphodontidae
Coryphodon eocaenus Owen 1846 pantodont
 Condylarthra - Hyopsodontidae
Hyopsodus loomisi McKenna 1960 condylarth
 Creodonta - Hyaenodontidae
Arfia shoshoniensis Matthew and Granger 1915 creodont
 Theriamorpha - Viverravidae
Didymictis leptomylus Cope 1880 placental
 Theriamorpha -
Miacis exiguus Matthew and Granger 1915 placental
 Perissodactyla - Equidae
"Hyracotherium aemulor" = Arenahippus aemulor
"Hyracotherium aemulor" = Arenahippus aemulor Gingerich 1991 horse
 Perissodactyla -
Cardiolophus radinskyi Gingerich 1991 odd-toed ungulate
 Artiodactyla - Diacodexeidae
Diacodexis metsiacus Cope 1882 even-toed ungulate
 Placentalia -
Rodentia indet. Bowdich 1821 rodent
 Primates - Microsyopidae
"Haplomylus speirianus" = Microsyops speirianus
"Haplomylus speirianus" = Microsyops speirianus Cope 1880 primate
 Primates - Notharctidae
Cantius mckennai Gingerich and Simons 1977 primate
Actinopteri
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar