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National Geologic Map Database

Geologic Unit: Parkman

Usage:

Parkman Sandstone Member of Mesaverde Formation (MT*,WY*)
Parkman Sandstone Member of Claggett Formation of Montana Group (MT*)
Parkman Sandstone Member of Judith River Formation of Montana Group (MT*)
Parkman Sandstone of Montana Group (MT*)
Parkman Sandstone Member of Judith River Formation (WY*)
Parkman Sandstone (WY)


Subunits:

FORMATION STATUS (alphabetical): Dead Horse Creek Member (WY), Ferguson Member (WY), Teapot Member (WY).


Geologic age:

Late Cretaceous (Campanian)*


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

Named from exposures near Parkman, Sheridan Co., WY (Darton, 1906).


AAPG geologic province:

Wind River basin*
Powder River basin*
Denver 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 ([ ]).