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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).