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National Geologic Map Database

Geologic Unit: Outlet Tunnel

Usage:

Outlet Tunnel unit (informal) in Carpenter Ridge Tuff (CO*-recognized locally in Creede district)

Informal. The rank or lithologic term should not be capitalized.


Geologic age:

early Tertiary (late Oligocene)*


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

Named from development at Outlet Tunnel [now Outlet Mine], Creede district, southwestern CO (Emmons and Larsen, 1923).
[Outlet Mine in center of N/2 sec. 18, T. 42 N., R. 1 E., San Luis Peak 7.5-min quadrangle, Mineral Co., Creede district, southwestern CO.]


AAPG geologic province:

San Juan Mountains province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).