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National Geologic Map Database

Geologic Unit: Birdhead

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