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National Geologic Map Database

Geologic Unit: Sage

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