Usage:
Sage Limestone Member of Snowy Range Formation of Gallatin Group (MT*,WY*)
Sage Member of Snowy Range Formation (MT)
Geologic age:
Late Cambrian*
Type section, locality, area and/or origin of name:
Type locality: on south slope of Castle Rock, at junction of the East Fork (of Mill Creek) with Mill Creek, [near center of] sec. 13, T. 6 S., R. 9 E., [approx. Lat. 45 deg. 19 min. 00 sec. N., Long. 110 deg. 33 min. 55 sec. W., Knowles Peak 7.5-min quadrangle, Gallatin National Forest], Park Co., MT. Named from Sage Creek which enters East Fork of Mill Creek 1.5 mi upstream from type locality (Lochman, 1950).
AAPG geologic province:
Bighorn basin
Central Montana uplift
Green River basin
Montana folded belt*
Wind River basin
Yellowstone province*
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 ([ ]).