Usage:
Molas Formation (AZ*,CO*,NM*,UT*)
Subunits:
Coalbank Hill Member (CO*).
Geologic age:
Early to Middle Pennsylvanian (Atokan to Morrowan)*
Type section, locality, area and/or origin of name:
Named from Molas Lake, in San Juan Mountains on Durango-Silverton Highway, Needle Mountains quadrangle, [San Juan Co.], southwestern CO (Cross and Howe, 1905).
Typical section measured on north side of Canyon Creek below Box Canyon, Ouray Co., CO (Burbank, 1930).
AAPG geologic province:
Black Mesa basin*
Eagle basin*
Paradox basin*
Piceance basin*
Plateau sedimentary province*
San Juan basin*
San Juan Mountains province*
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 ([ ]).