- Usage in publication:
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- Adobe Flat Shale Member
- Modifications:
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- Original reference
- Dominant lithology:
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- Shale
- Sandstone
- AAPG geologic province:
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- San Joaquin basin
Summary:
Adobe Flat Shale Member, in lower part of Panoche Formation. Name given to hard, dark-gray to black silty shales occurring in down faulted syncline west of Del Puerto piercement, [Mount Boardman 15-min quadrangle, Stanislaus County, central California]. Shales grade upward with increasing sandstone interbeds into typical Panoche sandstone-shale lithology. Shales within 300 feet stratigraphically of base of member contain INOCERAMUS LABIATUS of early Late Cretaceous (early Turonian) age. These shales rest on Knoxville(?) shales containing AUCELLA PIOCHII of Late Jurassic (middle to upper Portlandian) age.
[Type locality not designated.] Well exposed west of Wilcox Ridge, in sec. 23, T. 7 S., R. 6 E., and NE/4 sec. 3, T. 6 S., R. 6 E., [Mount Boardman 15-min quadrangle, Stanislaus Co., central CA]. Mapped around Adobe Flat in Stanislaus Co., central CA.
Source: US geologic names lexicon (USGS Bull. 1350, p. 7); supplemental information from 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 ([ ]).