Usage:
Hayfork Bally Meta-andesite (CA*)
Geologic age:
Jurassic, Middle*
Type section, locality, area and/or origin of name:
Exposures along main Forest Service road that crosses north slope of Hayfork Bally at altitude of 1200-1370 m, in secs. 27 and 28, T. 33 N., R. 12 E., and along branch of road that climbs north and west slopes of peak to lookout tower, Hayfork quadrangle, Trinity Co., CA (Irwin, 1977).
AAPG geologic province:
Klamath 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 ([ ]).