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National Geologic Map Database

Geologic Unit: Cochetopa Park

Usage:

Cochetopa Park Tuff (CO*)


Geologic age:

Tertiary*
Oligocene*


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

Named from Cochetopa Park, Saguache Co., CO (Steven and others, 1974).
["Reference sections"]: (1) typical densely welded tuff forms minor mesa cap just north of county road, about 2,000 ft west of McDonough Ranch headquarters on west side of Cochetopa Park; (2) soft ash-flow tuffs in eastern part of Cochetopa Park caldera best exposed in stream banks, roadcuts, and quarry walls along Archuleta Creek from its confluence with Cochetopa Creek upstream for 3 to 4 mi; (3) stream-sediment facies exposed largely in roadcuts along county road between McDonough Ranch and Cochetopa Creek (Steven and others, 1974).


AAPG geologic province:

San Luis basin*
San Juan Mountains province*
Piceance 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).