MP-186 (Eocene of the United States)

Where: Wyoming (44.6° N, 108.8° W: paleocoordinates 49.4° N, 91.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Wa-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 46760: 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
Paramys ? delicatus Leidy 1871 rodent
 Primates - Notharctidae
Cantius trigonodus Matthew 1915 primate
 Dermoptera -
Plagiomene multicuspis Matthew 1918 colugo
 Perissodactyla -
"Hyracotherium cristatum" = Systemodon tapirinus, Homogalax protapirinus
"Hyracotherium cristatum" = Systemodon tapirinus Cope 1875 odd-toed ungulate
Homogalax protapirinus Wortman 1896 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium pernix" = Arenahippus pernix
"Hyracotherium pernix" = Arenahippus pernix Marsh 1876 horse
 Theriamorpha - Phenacodontidae
Phenacodus trilobatus Cope 1881 condylarth
 Artiodactyla - Diacodexeidae
Diacodexis metsiacus Cope 1882 even-toed ungulate
 Creodonta - Hyaenodontidae
Prototomus robustus Matthew and Granger 1915 creodont
 Theriamorpha - Viverravidae
Didymictis protenus Cope 1874 placental
Viverravus rosei Polly 1997 placental
 Theriamorpha -
Vassacyon promicrodon Wortman and Matthew 1899 placental
"Miacis winkleri" = Gracilocyon winkleri Gingerich 1983 placental
 Theriamorpha - Metacheiromyidae
Palaeanodon ignavus Matthew 1918 placental
 Condylarthra - Hyopsodontidae
Hyopsodus latidens Denison 1937 condylarth
 Macroscelidea - Apheliscidae
Apheliscus insidiosus Cope 1874 elephant shrew
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
 Cimolesta - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
Reptilia
 Crocodylia - Alligatoridae
Allognathosuchus sp. Mook 1921 crocodilian