Usage:
Big Hole River gravel (informal) (MT)
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
Tertiary, late
Type section, locality, area and/or origin of name:
Named from exposures along the Big Hole River between Twin Bridges and Glen, Beaverhead Co., MT (Sears and others, 1989).
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 ([ ]).