Usage:
Big Elk Sandstone Member of Colorado Shale (MT*)
Big Elk Sandstone Member of Belle Fourche Formation (MT-local)
Big Elk Sandstone Member of Frontier Formation (MT-local)
Geologic age:
Early Cretaceous*
Type section, locality, area and/or origin of name:
Named from exposures in Big Elk dome in western part of Musselshell Valley, [Meagher and Sweetgrass Cos.], central southern MT (Bowen, 1918 [1922]).
AAPG geologic province:
Central Montana 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 ([ ]).