Usage:
Mulholland Formation of Contra Costa Group (CA)
Geologic age:
late Tertiary (Miocene)
Type section, locality, area and/or origin of name:
Type section stated to be on northeast slopes of Mulholland Hill and on ridges immediately northeast thereof, in northeast limb of Mulholland syncline, Concord 15-min quadrangle, Contra Costa Co., western CA. Named from Mulholland Hill, just northeast of Moraga Valley and upper San Pablo Valley, [west of town of Rheem], Contra Costa Co., western CA (Creely and others, 1982, p. 18).
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).