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National Geologic Map Database

Geologic Unit: Piedra

Usage:

No current usage.
(†Piedra Rhyolite (CO) replaced with Carpenter Ridge Tuff. See Carpenter Ridge.)


Geologic age:

early Tertiary (late Oligocene; Chattian)


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

Named from exposures in Piedra Peak, San Cristobal quadrangle, southwestern CO (Emmons and Larsen, 1923).


AAPG geologic province:

Piceance basin
San Juan Mountains province
San Luis 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 ([ ]).