Usage:
Pinnacles Volcanics (CA*)
Pinnacles Formation (CA)
Geologic age:
Tertiary
Miocene, early*
Type section, locality, area and/or origin of name:
Type section: exposures along High Peaks Trail west of Chalone Peak campground in Pinnacles National Monument, from SW/4 SE/4 sec. 35 to SW/4 SE/4 sec. 34 T. 16 S., R. 7 E., North Chalone Peak 7.5-min quadrangle, San Benito Co., CA (Matthews, 1973, PhD thesis).
AAPG geologic province:
California Coast Ranges 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 ([ ]).