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National Geologic Map Database

Geologic Unit: Los Pinos

Usage:

Los Pinos Formation (CO*,NM*)
Los Pinos Gravel (NM*)


Subunits:

(ascending): [†?]Biscara Member (NM), Esquibel Member (CO*,NM*), Jarita Basalt Member (NM), Cordito Member (CO*,NM*).


Geologic age:

Tertiary (Oligocene to Miocene)*


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

Named from exposures in canyon of Los Pinos Creek, near town of San Miguel, in extreme northern part of NM, about 10 or 12 mi southwest of Antonito, Conejos Co., central southern CO (Atwood and Mather, 1932; name credited to E.S. Larsen).


AAPG geologic province:

San Juan 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 ([ ]).