No current usage.
(†Otay Formation (CA) or †Otay Member of Rosarito Beach Formation (CA) replaced with Rosarito Beach Formation. See Rosarito Beach.)
Tertiary
Miocene
Type section: in natural amphitheater on northeast side of Chester Canyon opposite bentonite clay mine, southwestern San Diego Co., CA (Kuper and Gastil, 1977).
Peninsular 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 ([ ]).