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National Geologic Map Database

Geologic Unit: Morgan

Usage:

Morgan Formation (CO*,UT*,WY*)
Morgan Formation of Durst Group (CO,UT)


Subunits:

Hells Canyon Member (CO,UT).


Geologic age:

Pennsylvanian, Early*
Morrowan*
Pennsylvanian, Middle*
Atokan*
Desmoinesian*


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

Not designated. Origin of name not stated by author (Blackwelder, 1910).


AAPG geologic province:

Green River basin*
Uinta uplift*
Uinta basin
Wasatch uplift*
Piceance 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 ([ ]).