Usage:
Santa Margarita Sandstone (CA*)
Santa Margarita Formation (CA*)
Subunits:
(alphabetical) --all in CA [only Redrock Canyon Member adopted by USGS]: Huasna Member, Phoenix Member, Redrock Canyon Sandstone Member, Saucelito Member, Whiterock Bluff Shale Member.
Geologic age:
Tertiary
Miocene, middle*
Miocene, late*
Type section, locality, area and/or origin of name:
Type section: along Santa Margarita Creek, approximately 10 mi to north of Phoenix-Saucelito area [San Luis Obispo 15-min quadrangle, San Luis Obispo Co., CA] (Fairbanks, 1904; Hall, 1962).
AAPG geologic province:
California Coast Ranges province*
Mojave basin*
Transverse 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 ([ ]).