Usage:
No current usage.
(†San Miguel Cherts (CA) replaced with Marin Sandstone and Sausalito Chert, both of Franciscan Group. See Marin and Susalito.)
Geologic age:
Jurassic(?)
Type section, locality, area and/or origin of name:
[Type locality?]: San Miguel Hills, San Francisco Co., CA.
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 ([ ]).