U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Coopers Lake

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).