- Usage in publication:
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- Williams Sand Member
- Modifications:
-
- Named
- Dominant lithology:
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- Sand
- AAPG geologic province:
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- San Joaquin basin
Summary:
Named as member in lower part of Antelope Formation. Outcrops in secs.28,33,34,35 T32S R23E, M.D., Midway Sunset field, southwest edge of San Joaquin Valley, southern CA. Is a locally confined body of lensing sand beds. Is quartzose, fine grained to pebbly conglomeratic but mainly fine to coarse with local occasional beds of quartz and shale pebbles. Well cores in area of Midway Syncline find the unit to be silty to fine grained. Is older than Republic Sands (new) of Antelope Formation. Age given as late Miocene.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
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 ([ ]).