MP-203 (Eocene of the United States)

Where: Wyoming (44.6° N, 108.8° W: paleocoordinates 49.5° N, 91.7° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Wa-3/4

• 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 46773: authorized by Will Clyde, entered by Will Clyde on 24.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Rodentia - Ischyromyidae
Paramys copei Loomis 1907 rodent
 Primates - Microsyopidae
"Haplomylus speirianus" = Microsyops speirianus
"Haplomylus speirianus" = Microsyops speirianus Cope 1880 primate
 Primates - Notharctidae
Cantius mckennai Gingerich and Simons 1977 primate
 Primates - Omomyidae
Tetonius matthewi Bown and Rose 1987 tarsier
originally entered as "Tetonius mathewi"
 Dermoptera -
Plagiomene multicuspis Matthew 1918 colugo
 Perissodactyla -
Homogalax protapirinus Wortman 1896 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium aemulor" = Arenahippus aemulor
"Hyracotherium aemulor" = Arenahippus aemulor Gingerich 1991 horse
 Theriamorpha - Phenacodontidae
Ectocion osbornianus Cope 1882 condylarth
Phenacodus trilobatus Cope 1881 condylarth
 Artiodactyla - Diacodexeidae
Diacodexis metsiacus Cope 1882 even-toed ungulate
 Creodonta - Hyaenodontidae
Arfia shoshoniensis Matthew and Granger 1915 creodont
 Theriamorpha - Viverravidae
Didymictis protenus Cope 1874 placental
 Theriamorpha -
Miacis exiguus Matthew and Granger 1915 placental
 Acreodi - Mesonychidae
Pachyaena sp. Cope 1874 condylarth
 Condylarthra - Hyopsodontidae
Hyopsodus loomisi McKenna 1960 condylarth
 Cimolesta - Coryphodontidae
Coryphodon eocaenus Owen 1846 pantodont
Reptilia
 Loricata -
"Crocodilia indet." = Crocodylia
"Crocodilia indet." = Crocodylia Owen 1842 crocodilian