Usage:
Slim Sam Formation (MT*-recognized locally in Elkhorn Mountains area)
Geologic age:
Late Cretaceous*
Type section, locality, area and/or origin of name:
Named from exposures along east margin of Slim Sam basin, in sec. 22, T. 6 N., R. 1 W., Elkhorn Mountains, Broadwater Co., southwestern MT, about 1 mi east of map area (Klepper and others, 1957).
Reference section (Slim Sam restricted; starting at about 400 feet above base of Indian Creek section of Klepper and others, 1957, p. 30-31): in N/2 SW/4 and S/2 NW/4 sec. 6, T. 6 N., R. 1 E., Elkhorn Mountains, southwestern MT; [along Indian Creek, southeast of town of Hassel, approx. Lat. 46 deg. 18 min. 12 sec. N., Long. 111 deg. 39 min. 20 sec. W., Giant Hill 7.5-min quadrangle, Broadwater Co.] (Tysdal, 2000).
AAPG geologic 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 ([ ]).