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National Geologic Map Database

Geologic Unit: Blanco Basin

Usage:

Blanco Basin Formation (CO*)


Geologic age:

early Tertiary (early Eocene)*


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

Named from exposures about Blanco Basin, [in T. 34 and 35 N., R. 1 and 2 E.], central part of Summitville quadrangle, [Archuleta Co.], southwestern CO (Cross and Larsen, 1935).


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 ([ ]).