Usage:
Etchegoin Formation (CA*)
Subunits:
(alphabetical) --all in CA*: Carman Sandstone Member, Tupman Shale Member.
Geologic age:
Tertiary
Miocene, late*
Pliocene*
Type section, locality, area and/or origin of name:
Type section: exposures in vicinity of Etchegoin Ranch, 20 mi northwest of Coalinga, in NW/4 sec. 1, T. 19 S., R. 15 E., Fresno Co., CA. Named from Etchegoin Ranch (Anderson, 1905. See also Arnold and Anderson, 1910; Dibblee, 1973).
Reference section: exposures north of Reef Ridge, between Big Tar and Garza Creeks, Garza Peak quadrangle, 3 to 5 mi southeast of Avenal, southern CA (Dibblee, 1973).
AAPG geologic 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 ([ ]).