Usage:
Jameson Shale Member of Markley Sandstone (CA*-recognized locally in Napa Co.)
Geologic age:
Eocene*
Type section, locality, area and/or origin of name:
Named from Jameson Canyon in Carquinez quadrangle, north of San Francisco Bay. Occupies a single area between Elkhorn Peak and Napa Junction, Napa Co., northwestern CA (Weaver, [1949]).
AAPG geologic province:
Northern Coast Range 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 ([ ]).