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National Geologic Map Database

Geologic Unit: Etchegoin

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).