Usage:
Slim Buttes Formation (SD)
Geologic age:
early Tertiary (late Eocene; Duchesnean NALMA)
Type section, locality, area and/or origin of name:
Type section: Slim Buttes, Harding Co., SD.
Standard section: [along Rock Spring Trail], Slim Buttes, in NW/4 SE/4 sec. 11, T. 16 N., R. 8 E., Sheep Mountain 7.5-min quadrangle, Harding Co., Custer National Forest, northwestern SD (Malhotra and Tegland, 1960).
AAPG geologic province:
Williston basin
Sioux uplift
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 ([ ]).