Usage:
Franciscan Complex (CA*)
Franciscan Formation (CA)
Subunits:
COMPLEX STATUS (alphabetical) --all in CA: Calera Limestone*, Laytonville Limestone.
FORMATION STATUS (alphabetical) --all in CA: Corral Hollow Shale Member, Del Puerto Keratophyre Member, Lotta Creek Tuff Member.
Geologic age:
Late Jurassic to Miocene*
Type section, locality, area and/or origin of name:
Named from extensive exposures at San Francisco, San Francisco Co., western CA (Lawson, 1895; US geologic names lexicon, USGS Bull. 896).
AAPG geologic province:
California Coast Ranges province*
Northern Coast Range province
San Joaquin basin
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 ([ ]).