MP-257 (Eocene of the United States)

Where: Wyoming (44.4° N, 108.6° W: paleocoordinates 49.2° N, 91.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Wa-5

• 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 46820: authorized by Will Clyde, entered by Will Clyde on 24.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines -
Testudines indet. Batsch 1788 turtle
 Cimolesta - Coryphodontidae
Coryphodon armatus Cope 1872 pantodont
 Leptictida - Leptictidae
Palaeictops bicuspis Cope 1880 eutherian
 Primates - Microsyopidae
Niptomomys thelmae Gunnell and Gingerich 1981 primate
Microsyops angustidens Matthew 1915 primate
 Primates - Notharctidae
Cantius ? abditus Gingerich and Simons 1977 primate
 Primates - Paromomyidae
Phenacolemur sp. Matthew 1915 primate
 Glires -
 Perissodactyla -
Homogalax protapirinus Wortman 1896 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium pernix" = Arenahippus pernix
"Hyracotherium pernix" = Arenahippus pernix Marsh 1876 horse
 Creodonta - Oxyaenidae
Oxyaena forcipata Cope 1874 creodont
Oxyaena intermedia Denison 1938 creodont
 Ferae - Viverravidae
Didymictis protenus Cope 1874 placental
 Ferae - Epoicotheriidae
"Alocodontulum atopum" = Tubulodon atopum
"Alocodontulum atopum" = Tubulodon atopum Rose et al. 1978 placental
 Macroscelidea - Apheliscidae
Apheliscus insidiosus Cope 1874 elephant shrew
 Tillodontia - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
 Ungulata - Hyopsodontidae
Hyopsodus simplex Loomis 1905 condylarth
 Ungulata - Diacodexeidae
Bunophorus etsagicus Cope 1882 even-toed ungulate
Diacodexis metsiacus Cope 1882 even-toed ungulate
 Ungulata - Phenacodontidae
Phenacodus vortmani Cope 1880 condylarth
 Hyaenodonta -
Prolimnocyon atavus Matthew and Granger 1915 eutherian
Didelphodus absarokae Cope 1881 eutherian