Middle Oreodon Beds (1892 AMNH Collection) (Oligocene of the United States)

Where: Pennington and Scenic County, South Dakota (43.9° N, 102.5° W: paleocoordinates 45.0° N, 94.3° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: upper Scenic Member (Brule Formation), Orellan (33.9 - 33.3 Ma)

Environment/lithology: terrestrial

Reposited in the AMNH

Primary reference: H. F. Osborn and J. L. Wortman. 1894. Fossil mammals of the Lower Miocene White River beds. Collection of 1892. Bulletin of the American Museum of Natural History 6(7):199-228 [J. Alroy/J. Alroy/M. Carrano]more details

PaleoDB collection 17142: authorized by John Alroy, entered by John Alroy on 18.10.1995, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• based on Osborn 1937, this is mostly from Indian Creek, Corral Draw, and Quinn Draw
Mammalia
 Perissodactyla - Hyracodontidae
Hyracodon sp. Leidy 1856 odd-toed ungulate
 Perissodactyla - Rhinocerotidae
Subhyracodon occidentalis1 Leidy 1850 rhinoceros
 Perissodactyla - Tapiridae
Colodon occidentalis1 Leidy 1868 tapir
 Perissodactyla - Equidae
Miohippus obliquidens n. sp.2 Osborn 1904 anchitheriine horse
one of the original "Mesohippus bairdi" specimens (not clear if M. bairdi is present at this level at all); see also Prothero and Shubin 1989
 Ungulata - Tayassuidae
Perchoerus nanus3 Marsh 1894 peccary
"Oreodon beds," Big Badlands, SD
 Ungulata - Entelodontidae
Archaeotherium mortoni1 Leidy 1850 even-toed ungulate