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National Geologic Map Database

Geologic Unit: Rico

Usage:

No current usage.
(Rocks of †Rico Formation (AZ*,CO*,NM*,UT*) reallocated to lower part of Cutler Group and Honaker Trail Formation of Hermosa Group. See Cutler and Honaker Trail.)


Geologic age:

Late Pennsylvanian to early Permian*


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

Named from exposures in Rico Mountains, [Dolores Co.], southwestern CO (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Paradox basin*
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 ([ ]).