U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Cierbo

Usage:

Cierbo Sandstone of San Pablo Group (CA*)
Cierbo Formation of San Pablo Group (CA*)


Geologic age:

late Tertiary (late Miocene)*


Type section, locality, area and/or origin of name:

Type section: south side of Canada del Cierbo near Carquinez Straits, [Benicia 7.5-min quadrangle, Contra Costa Co.], Mount Diablo region, western CA (Clark, 1921).


AAPG geologic province:

Northern Coast Range province*
Sacramento 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 ([ ]).