Usage:
Coopers Lake Limestone Member of Jefferson Formation (MT)
Geologic age:
Late Devonian
Type section, locality, area and/or origin of name:
Type locality: on southeastern slope of southwestern peak of White Ridge, in SW/4 sec. 16, T. 22 N., R. 11 W., Lewis and Clark Co., northwestern MT. Named from fact that it forms a large part of Jefferson limestone over northeastern part of Coopers Lake quadrangle, especially in Powell Co., northwestern MT (Deiss, 1933).
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 ([ ]).