UNSM Sx-22 (Above NPAZ) ( of the United States)

Also known as Round Top, in part

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.3° N, 98.0° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Brown Siltstone Beds Formation, Arikareean (29.5 - 18.5 Ma)

Environment/lithology: terrestrial

Reposited in the UNSM

Primary reference: 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]more details

PaleoDB collection 17718: authorized by John Alroy, entered by John Alroy on 05.08.1996

Creative Commons license: CC BY (attribution)

Taxonomic list

• just above NPAZ based on occurrence of "parasimus": see Tedford et al. 1985
"White River Fauna III" of Tedford et al. 1985, in part
Mammalia
 Artiodactyla - Merycoidodontidae
Sespia nitida, "Leptauchenia parasimus" = Leptauchenia decora
Sespia nitida Leidy 1869 oreodont
exact locality not certain, but strongly implied to be Sx-22
"Leptauchenia parasimus" = Leptauchenia decora Leidy 1856 oreodont
"upper Gering"