Usage:
No current usage?
(†Warm Creek Shale of Colorado Group (MT) considered abandoned? Uncertain if used by MT Geol. Survey. Not used by the USGS. Rocks of †Warm Creek Shale reallocated to Belle Fourche Shale, Greenhorn Limestone, Carlile Shale, Niobrara Formation, and Telegraph Creek Formation. See Belle Fourche, Greenhorn, Carlile, Niobrara, and Telegraph.)
Geologic age:
Late Cretaceous
Type section, locality, area and/or origin of name:
Named from exposures along Big Warm and Little Warm Creeks, Little Rocky Mountain region, north-central MT (Collier and Cathcart, 1922).
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 ([ ]).