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National Geologic Map Database

Geologic Unit: Steele

Usage:

Steele Shale (MT*,WY*)
Steele Member of Cody Shale (WY*)


Subunits:

FORMATION STATUS (alphabetical): Ardmore Bentonite Bed (MT*,WY*), Cow Creek Sandstone Member (WY*), Shannon Sandstone Member (MT*,WY*), Sussex Sandstone Member (MT*,WY*).
MEMBER STATUS (alphabetical): Shannon Sandstone Bed (WY*), Sussex Sandstone Bed (WY*).


Geologic age:

Late Cretaceous (Campanian)*


Type section, locality, area and/or origin of name:

Type locality: Fort Steele, on the North Platte River, Carbon Co., WY.


AAPG geologic province:

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