Usage:
Grizzly Peak Tuff (CO*)
Geologic age:
early Tertiary (early Oligocene)*
Type section, locality, area and/or origin of name:
Named from development on and around Grizzly Peak, Chaffee Co., central CO (Howell, 1919); these exposures designated the type area by Fridrich and others (1991).
[Grizzly Peak (13, 970 ft elevation) along Continental Divide, north of Garfield Peak and Red Mountain, Lat. 39 deg. 02 min. 33 sec. N., Long. 106 deg. 35 min. 51 sec. W., in sec. 31, T. 11 S., R. 82 W., and sec. 6, T. 12 S., R. 82 W., Chaffee-Pitkin Co. line, Independence Pass 7.5-min quadrangle (1998 ed.), central CO.]
AAPG geologic province:
Eagle 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 ([ ]).