Middle Oreodon Beds (1892 AMNH Collection): Orellan, South Dakota

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Perissodactyla - Hyracodontidae
Hyracodon sp. Leidy 1856
Mammalia - Perissodactyla - Rhinocerotidae
Aceratherium occidentale (Leidy 1850)
    = Subhyracodon occidentalis Leidy 1850
Alroy 2002
Mammalia - Perissodactyla - Tapiridae
Mesohippus longipes n. sp. Osborn and Wortman 1894
    = Colodon occidentalis Leidy 1868
Alroy 2002
discussed in text but omitted from table
Mammalia - Perissodactyla - Equidae
Miohippus obliquidens n. sp. (Osborn 1904)
Osborn 1904
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
Mammalia - Ungulata - Tayassuidae
Perchoerus nanus (Marsh 1894)
Prothero 2009
"Oreodon beds," Big Badlands, SD
Mammalia - Ungulata - Entelodontidae
Elotherium mortoni (Leidy 1850)
    = Archaeotherium mortoni Leidy 1850
Alroy 2002
may include "Elotherium imperator"
see common names

Country:United States State/province:South Dakota County:Pennington and Scenic
Coordinates: 43.9° North, 102.5° West (view map)
Paleocoordinates:45.0° North, 94.3° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Period:Paleogene Epoch:Oligocene
Stage:Rupelian 10 m.y. bin:Cenozoic 4
Key time interval:Orellan
Age range of interval:33.90000 - 33.30000 m.y. ago
* legacy (obsolete) database fields
Formation:Brule Member:upper Scenic
Local section:BgBad Local bed:5
Local order:bottom to top
Lithology and environment
Environment:terrestrial indet.
Modes of preservation:body
Collection methods and comments
Museum repositories:AMNH
Taxonomic list comments:based on Osborn 1937, this is mostly from Indian Creek, Corral Draw, and Quinn Draw
Database number:17142
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Research group:vertebrate
Created:1995-10-18 00:00:00 Last modified:2002-06-03 03:27:41
Access level:the public Released:1995-10-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

2711. 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]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Uhen]
2699 H. F. Osborn. 1904. New Oligocene horses. Bulletin of the American Museum of Natural History 20(13):167-179 [J. Alroy/J. Alroy/T. Liebrecht]
57282 D. R. Prothero. 2009. The Early Evolution of the North American Peccaries (Artiodactyla: Tayassuidae). Papers on Geology, Vertebrate Paleontology, and Biostratigraphy in Honor of Michael O. Woodburne (Museum of Northern Arizona Bulletin 65) 509-541 [J. Marcot/J. Marcot]