WW-78 (Eocene of the United States)

Where: Washakie County County, Wyoming (44.2° N, 107.9° W: paleocoordinates 48.7° N, 91.3° W)

• coordinate stated in text

When: Wa-0 mammal zone, Willwood Formation, Early/Lower Eocene (55.8 - 48.6 Ma)

• in yellow/gray above Red 1

Environment/lithology: "floodplain"lithified, paleosol/pedogenic, muddy

• in yellow/gray above Red 1

Primary reference: K. D. Rose, A. E. Chew, R. H. Dunn, M. J. Kraus, H. C. Fricke and S. P. Zack. 2012. Earliest Eocene mammalian fauna from the Paleocene-Eocene Thermal Maximum at Sand Creek Divide, southern Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology 36:1-122 [J. Bloch/J. Bloch]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 154258: authorized by Jonathan Bloch, entered by Jonathan Bloch on 06.02.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Cimolesta - Esthonychidae
Esthonyx sp. Cope 1874 tillodont
"These teeth appear to be too large to belong to E. spatularius and suggest the presence of a second species of Esthonyx during the PETM."
 Condylarthra - Hyopsodontidae
Hyopsodus loomisi McKenna 1960 condylarth
said to be "5m above WW-78"
 Theriamorpha - Metacheiromyidae
Palaeanodon nievelti Gingerich 1989 placental
(partial skeleton including dentary fragment, vertebrae, fragmentary humerus, radius, ulna, pelvis, femora, tibiae, calcaneus, metapodials, phalanges)
 Theriamorpha - Viverravidae
Didymictis leptomylus Cope 1880 placental
 Theriamorpha - Phenacodontidae
Ectocion parvus Granger 1915 condylarth
 Perissodactyla - Equidae
"Hyracotherium sandrae" = Sifrhippus sandrae
"Hyracotherium sandrae" = Sifrhippus sandrae Gingerich 1989 horse