Usage:
Shedhorn Sandstone (ID*,MT*,WY*)
Geologic age:
Middle Permian (Guadalupian)*
Type section, locality, area and/or origin of name:
Type section: in cliffs on north side of Indian Creek, in SW/4 sec. 20, T. 8 S., R. 2 E., Madison Co., MT (McKelvey and others, 1959).
AAPG geologic province:
Yellowstone province*
Montana folded belt*
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 ([ ]).