Steele Butte Breaks (Eocene of the United States)

Also known as BS-1

Where: Sublette County, Wyoming (42.7° N, 110.1° W: paleocoordinates 47.7° N, 93.5° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Alkali Creek Tongue Member (Wasatch Formation), Wasatchian (55.8 - 50.3 Ma)

• originally "Arkosic Facies" of the "New Fork Tongue Member"

Environment/lithology: terrestrial

Primary reference: R. M. West. 1973. Geology and mammalian paleontology of the New Fork-Big Sandy area, Sublette County, Wyoming. Fieldiana: Geology 29 [J. Alroy/J. Alroy]more details

PaleoDB collection 15839: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Primates - Microsyopidae
Microsyops cf. scottianus2 Cope 1881 primate
 Primates - Notharctidae
Cantius cf. nunienus1 Cope 1881 primate
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
 Rodentia - Paramyidae
Paramyidae indet.1 Miller and Gidley 1918 rodent
 Placentalia -
Perissodactyla indet.1 Owen 1848 odd-toed ungulate
 Perissodactyla - Brontotheriidae
Lambdotherium popoagicum Cope 1880 brontothere
 Perissodactyla - Hyrachyidae
Hyrachyus modestus Leidy 1870 odd-toed ungulate
 Perissodactyla -
Heptodon posticus Cope 1882 odd-toed ungulate
Heptodon calciculus Cope 1880 odd-toed ungulate
 Perissodactyla - Palaeotheriidae
Hyracotherium vasacciense Cope 1872 odd-toed ungulate
 Creodonta - Oxyaenidae
Oxyaena lupina3 Cope 1874 creodont
Oxyaena forcipata Cope 1874 creodont
not discussed by Gunnell 1998a
 Ferae - Viverravidae
Didymictis altidens Cope 1880 placental
 Taeniodonta - Stylinodontidae
Stylinodon sp.5 Marsh 1874 taeniodont
 Trogontia - Esthonychidae
cf. Trogosus sp.6 Leidy 1871 tillodont
 Ungulata - Hyopsodontidae
Hyopsodus sp.1 Leidy 1870 condylarth
Hyopsodus wortmani Osborn 1902 condylarth
 Ungulata - Uintatheriidae
Bathyopsis fissidens Cope 1881 uintathere
 Ungulata - Diacodexeidae
Diacodexis secans4 Cope 1881 even-toed ungulate
 Ungulata - Phenacodontidae
Meniscotherium chamense Cope 1874 condylarth
Phenacodus vortmani Cope 1880 condylarth
confirmed by Thewissen 1990
 Hyaenodonta - Hyaenodontidae
? Prototomus sp. Cope 1874 eutherian
Tritemnodon sp. Matthew 1906 eutherian