Usage:
Huichica Formation (CA*)
Geologic age:
Pleistocene
Pliocene*
Type section, locality, area and/or origin of name:
Named from Huichica Creek at head of San Pablo Bay in northern part of Mare Island quadrangle, Napa Co., northwestern CA. Exposed around margins of Napa and Sonoma Valleys (Weaver, 1949).
AAPG geologic province:
Northern Coast Range 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 ([ ]).