Usage:
Del Puerto Formation (CA)
Del Puerto Keratophyre Member of Franciscan Formation (CA)
Geologic age:
Jurassic, Late
Type section, locality, area and/or origin of name:
Not stated. Well exposed along Del Puerto Creek, in SE/4 sec. 4, T. 6 S., R. 6 E., Mount Boardman 15-min quadrangle, Stanislaus Co., west-central CA (Maddock, 1964).
AAPG geologic province:
San Joaquin basin
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 ([ ]).