Usage:
Markley Sandstone (CA*)
Markley Formation (CA*)
Subunits:
FORMATION STATUS (alphabetical) --all in CA: Jameson Shale Member*, Kellogg Shale Member, Sidney Flat Shale Member*.
Geologic age:
Eocene, late*
Type section, locality, area and/or origin of name:
Named from exposures in vicinity of Markley Canyon, Mount Diablo region, [Contra Costa Co., Mount Diablo 15-min quadrangle], San Francisco Bay region, western CA (Clark, 1919).
AAPG geologic province:
Sacramento basin*
Santa Cruz 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 ([ ]).