Usage:
No current usage?
(†Sage Hen Limestone Member of Colorado Shale (MT) considered obsolete? Uncertain if used by the MT Geol. Survey. Not used by the USGS.)
Geologic age:
Late Cretaceous
Type section, locality, area and/or origin of name:
Named from exposures in Sage Hen Creek, [in secs. 9 and 16, T. 14 N., R. 30 E., Garfield Co.], Little Rocky Mountain region, central northern MT (Lupton and Lee, 1921).
AAPG geologic province:
Williston basin
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 ([ ]).