Usage:
Piedras Altas Formation (CA*)
Geologic age:
Tertiary(?)*
Type section, locality, area and/or origin of name:
Principal reference section: in Piedras Altas Hills (Lat. 35 deg. 52 min. N., Long. 121 deg. 12 min. 30 sec. W.), Burnett Peak quadrangle, Monterey Co., CA (Seiders, 1989).
Reference locality: outcrops in nearby Palisades on north bank of Nacimiento River, in sec. 29, T. 24 S., R. 8 E., Bryson quadrangle, San Luis Obispo Co., CA (Seiders, 1989).
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 ([ ]).