Big Sand Draw/Carter Draw (Eocene of the United States)

Where: Fremont County, Wyoming (43.2° N, 108.2° W: paleocoordinates 48.0° N, 91.4° W)

• coordinate based on political unit

When: Lost Cabin Member (Wind River Formation), Wasatchian (55.8 - 50.3 Ma)

Environment/lithology: terrestrial

Primary reference: W. W. Korth and R. L. Evander. 1982. A New Species of Orohippus (Perissodactyla, Equidae) from the Early Eocene of Wyoming. Journal of Vertebrate Paleontology 2(2):167-171 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 15902: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• includes Thirty-one Cent Q., Pot Luck Q., Bunny Foot Q., and Halfway Draw Q.
date of 49.2 (= 50.5) Ma on Halfway Draw Tuff (Evernden et al. 1964: KA 1012) is 2 mi. WSW of Bunny Foot Q.; however, Mauger 1977 argues that the sample is degraded and the date is probably too young
Mammalia
 Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
 Primates - Omomyidae
Shoshonius cooperi Granger 1910 tarsier
 Primates - Microsyopidae
Microsyops cf. scottianus Cope 1881 primate
 Primates - Notharctidae
Notharctus venticolus Osborn 1902 primate
 Perissodactyla - Palaeotheriidae
Hyracotherium vasacciense Cope 1872 odd-toed ungulate
 Perissodactyla - Equidae
Orohippus proteros Korth and Evander 1982 horse
 Perissodactyla -
Heptodon sp. Cope 1882 odd-toed ungulate
Homogalax sp. Hay 1899 odd-toed ungulate
 Perissodactyla - Brontotheriidae
Lambdotherium popoagicum Cope 1880 brontothere
Eotitanops cf. borealis Cope 1880 brontothere
 Theriamorpha - Leptictidae
Palaeictops sp. Matthew 1899 eutherian
presumably OK but see Novacek 1977