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National Geologic Map Database

Geologic Unit: Rat Creek

Usage:

Rat Creek Tuff (CO*)


Geologic age:

early Tertiary (late Oligocene; Chattian)*


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

Named from development on Rat Creek, [in T. 42 N., R. 1 W., San Luis Peak 7.5-min quadrangle, Mineral Co.], Creede district, southwestern CO (Emmons and Larsen, 1923).


AAPG geologic province:

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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).