Trail Branch 1 (Miocene to of the United States)

Also known as OMNH V1198

Where: Roger Mills County, Oklahoma (35.8° N, 99.7° W: paleocoordinates 36.1° N, 98.0° W)

• coordinate estimated from map

When: Ogallala Formation, Clarendonian to Clarendonian (12.5 - 2.6 Ma)

• "These investigators noted a locally complex set of basal Ogallala Formation fluvial and eolian depos- its with extensive Pleistocene and Holocene reworking by multiple can- yon cut-and-fill cycles, all atop the Permian Doxey Shale (J. P. Thurmond, in litt.). The Miocene vertebrate bones had been redeposited in a Pleis- tocene or Holocene bed."

•"Many of the localities yielding vertebrate fossils in west-central Oklahoma occur along the outcrop margin of the Ogallala Formation, where there seems to be extensive reworking of the Ogallala sediments. This and the paucity of age-diagnostic taxa make it difficult to assign most of the Roger Mills County localities to a land mammal age."

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by L. Lucas, J. P. Thurmond, and D. Wyckoff in 2000

Primary reference: N. J. Czaplewski. 2008. Miocene Vertebrates From Ogallala Formation Sites in Western Oklahoma. In S. G. Lucas (ed.), Neogene Mammals (New Mexico Museum of Natural History and Science Bulletin) 44:1-14 [J. Marcot/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 170186: authorized by Jonathan Marcot, entered by Jonathan Marcot on 16.06.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Perissodactyla - Equidae
Nannippus sp. Matthew 1926 hipparionine horse
OMNH 71035, 71036