Usage:
Glenn Creek Shale Member of Jefferson Limestone (MT)
Geologic age:
Late Devonian
Type section, locality, area and/or origin of name:
Type locality: on south side of southwestern peak of White Ridge, [Slategoat Mountain 7.5-min quadrangle, Lewis and Clark Co., northwestern MT] (Deiss, 1933).
Named from Glenn Creek, [Saypo quadrangle, Lewis and Clark Co., northwestern MT], whose middle branch heads at eastern base of White Ridge. On Saypo topographic sheet [1903 ed.] the names Glenn Creek and Moose Creek have been interchanged (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 ([ ]).