Tensleep Sandstone (WY*)
Medicine Lodge Creek and Hyatt Ranch "members"
Pennsylvanian, Middle*
Desmoinesian*
Pennsylvanian, Late*
Missourian*
Virgilian*
Permian, Early*
Wolfcampian*
Not designated. Name derived from extensive exposures in walls of lower canyon of Tensleep Creek, Big Horn Co., WY (Darton, 1904).
Wind River basin*
Green River basin*
Powder River basin*
Bighorn basin*
Yellowstone province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).