Usage:
Red Bluff Formation (MT*)
Geologic age:
Eocene*
Oligocene*
Type section, locality, area and/or origin of name:
Type locality [composite; no complete section exposed]: (1) lower diamictite member is along boundary between SE/4 sec. 14 and NE/4 sec. 23, T. 3 S., R. 1 W.; (2) upper member is along unnamed creek in W/2 sec. 13, T. 3 N., R. 1 W., Madison Co., MT. Named from town of Red Bluff, Madison Co., MT, where unit is best exposed (Kellogg, 1994; name credited to Andretta and Alsup, 1960).
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 ([ ]).