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National Geologic Map Database

Geologic Unit: Vallecito

Usage:

Vallecito Conglomerate (CO*)


Geologic age:

Early to Mesoproterozoic*


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

Named from exposures on both sides of Vallecito Creek, for about 1 mi north of south boundary of Needle Mountains 15-min quadrangle, La Plata Co., southwestern CO (Cross and Howe, 1905).


AAPG geologic province:

Southern Rocky Mountain region*


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 ([ ]).