Cedar Pass (Leptauchenia Clays): Whitneyan, South Dakota

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Avetheropoda - Bathornithidae
Paracrax gigantea n. sp. Cracraft 1968
Cracraft 1968
"from Leptauchenia beds, Poleslide member... 2 miles north of east of Cedar Pass... collected in 1940 by M. F. Skinner, R. L. Mefferd, and associates"
Mammalia - Rodentia - Cricetidae
Cricetidae indet. Fischer von Waldheim 1817
Mammalia - Rodentia - Aplodontidae
Prosciurus sp. (Matthew 1903)
    = Aplodontidae indet. Brandt 1855
Alroy 2002
Aplodontidae indet. Brandt 1855
Mammalia - Rodentia
Proheteromys sp. Wood 1932
240 specimens
    = Geomyoidea indet. Bonaparte 1845
Alroy 2002
Mammalia - Rodentia - Eomyidae
Adjidaumo sp. Hay 1899
9 specimens
Mammalia - Rodentia - Castoridae
Agnotocastor sp. Stirton 1935
42 specimens
Palaeocastor nebrascensis (Leidy 1856)
Xu 1996
"Basal Leptauchenia beds, 15-20 feet below the First White Layer, Interior"
Mammalia - Rodentia - Zapodidae
Zapodidae indet. Coues 1875
Mammalia - Lagomorpha - Leporidae
Palaeolagus sp. Leidy 1856
767 specimens
Mammalia - Lipotyphla - Erinaceidae
Erinaceidae indet. Fischer von Waldheim 1817
Proterix sp. Matthew 1903
15 specimens
Mammalia - Lipotyphla - Geolabididae
Geolabis sp. Cope 1884
5 specimens
    = Centetodon sp. Marsh 1872
Alroy 2002
Mammalia - Perissodactyla - Hyracodontidae
Hyracodon sp. Leidy 1856
Tedford et al. 1996
Mammalia - Perissodactyla - Equidae
Miohippus obliquidens (Osborn 1904)
Tedford et al. 1996
Mammalia - Soricidae
Soricidae indet. Fischer 1814
Mammalia - Proscalopidae
Proscalops sp. Matthew 1901
33 specimens
Mammalia - Carnivora - Canidae
Osbornodon sesnoni (Macdonald 1967)
Wang 1994
N of Cedar Pass, base of Leptauchenia beds, Jackson Co.
Hesperocyon pavidus (Stock 1933)
23 specimens
    = Archaeocyon pavidus Stock 1933
Wang 1994
0.25 mi W of Cedar Pass, basal Leptauchenia beds; said by Wang et al. 1999 to be from the basal Poleslide; may include "H. sp." ( although his is an F:AM specimen
Mammalia - Ungulata - Merycoidodontidae
Hadroleptauchenia primitiva Schultz and Falkenbach 1968
    = Leptauchenia major Leidy 1856
Schultz and Falkenbach 1968
"1/2 mi. E. of Cedar Pass"; "Pseudocyclopidius frankforteri" from "W. of"; "1/4-1 mi. E. of"; "near"; and "1 1/2 mi. NE. of" Cedar Pass; all "Brule Zone D"
Leptauchenia decora Leidy 1856
Schultz and Falkenbach 1968
Brule Zone D, both E and W of Cedar Pass
Paramerycoidodon major Leidy 1853
    = Merycoidodon major Leidy 1853
Schultz and Falkenbach 1968
recombined as Merycoidodon (Otarohyus) major
"1 1/2-2 1/2 mi. NE."; "1/4-1 mi. E."; "1/4-2 mi. W." of Cedar Pass; "400 yds. E. of Road" Cedar Pass; "M. lambi" type, 2 mi W of Cedar Pass, 25' above base of Leptauchenia beds; "1/4-1 mi. E."; "1 mi. NE."; and "1/4 mi W" of Cedar Pass; "M. lynchi" from "1/4 mi. W. of Cedar Pass"; "P. wanlessi" from 1/5-1 mi. E."; "1/4-1 1/4 mi. W."; "1/2-2/12 mi. NE." of Cedar Pass; "N. of Interior"; "Otionohyus alexi" from "E. side"; "1 mi. E."; "1 1/2 mi. NE."; "1/4 mi. W." of Cedar Pass; "2 1/2 mi. N. of Interior"; all from Brule Zone D, some presumably from below Wilson's sample
Mammalia - Ungulata - Tayassuidae
Tayassuidae indet. Palmer 1897
"peccary": Tedford et al. 1996
Mammalia - Ungulata - Leptomerycidae
Leptomeryx sp. Leidy 1853
    = Leptomerycidae indet. Zittel 1893
Alroy 2002
Mammalia - Didelphimorphia - Didelphidae
Peratherium sp. Aymard 1850
    = Didelphidae indet. Gray 1821
Alroy 2002
see common names

Country:United States State/province:South Dakota County:Jackson
Coordinates: 43.5° North, 101.9° West (view map)
Paleocoordinates:44.4° North, 94.3° West
Basis of coordinate:based on political unit
Period:Paleogene Epoch:Oligocene
Stage:Rupelian 10 m.y. bin:Cenozoic 4
Key time interval:Whitneyan
Age range of interval:33.30000 - 30.80000 m.y. ago
* legacy (obsolete) database fields
Member:upper Poleslide
Local section:BgBad Local bed:8
Local order:bottom to top
Stratigraphy comments: Leptauchenia Clays
Lithology and environment
Environment:terrestrial indet.
Modes of preservation:body
Collection methods and comments
Collection size:894 specimens
Taxonomic list comments:NISP 1134, but this includes only "small mammals"
Morris Skinner collections from Cedar Pass mentioned by Tedford et al. 1996 are clearly from this facies
Database number:17317
Authorizer:J. Alroy Enterer:J. Alroy
Research group:vertebrate
Created:1995-03-26 00:00:00 Last modified:2002-06-03 03:27:42
Access level:the public Released:1995-03-26 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

3707. R. W. Wilson. 1985. The Dentition of the Paleocene "Insectivore" Genus Acmeodon Matthew and Granger (?Palaeoryctidae, Mammalia). Journal of Paleontology 59(3):713-720 [J. Alroy/J. Alroy/J. Ju]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Uhen]
28306 J. Cracraft. 1968. A review of the Bathornithidae (Aves, Gruiformes), with remarks on the relationships of the suborder Cariamae. American Museum Novitates 2326:1-46 [J. Alroy/J. Alroy]
3069 C. B. Schultz and C. H. Falkenbach. 1968. The Phylogeny of the Oreodonts. Part 1: Merycoidodontinae, Eporeodontinae, and Leptaucheniinae, Three Subfamilies Of Oreodonts, With an Appendix to the Revision Of The Merycoidodontidae, and Part 2. Summary and Conclusions Concerning the Merycoidodontidae. Bulletin of the American Museum of Natural History 139:1-498 [J. Alroy/J. Alroy/J. Marcot]
3386 R. H. Tedford et al. 1996. [J. Alroy/J. Alroy]
6226 X. Wang. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 221:1-207 [J. Alroy/J. Alroy/J. Alroy]
3779 X. Xu. 1996. Castoridae. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 412-432 [J. Alroy/J. Alroy/J. Marcot]