Usage:
No current usage.
(Rocks of †Birdhead Sandstone Member of Cloverly Formation (MT,WY), or †Birdhead Sandstone Member of Thermopolis Shale (MT), reallocated to Fall River Sandstone. See Fall River.)
Geologic age:
Early Cretaceous
Type section, locality, area and/or origin of name:
Named from exposures in Birdhead Coulee, which cuts across the sandstone in T. 3 S., R. 27 E., Yellowstone Co., cental southern MT (Thom and others, 1935).
AAPG geologic province:
Powder River basin
Central Montana uplift
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 ([ ]).