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; Chattian)*
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 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 ([ ]).