- Usage in publication:
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- Escobar sandstone
- Modifications:
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- Original reference
- AAPG geologic province:
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- Sacramento basin
Summary:
Pg. 19 (chart), 44-48, pls. 4A, 4B, 4C. Escobar sandstone. Proposed for massive thick-bedded grayish and yellowish-brown medium-grained sandstones with subordinate amounts of interstratified brown silty shales which overlie Muir sandstone (new) and underlie Alhambra formation (new). Thickness at type section approximately 1,200 feet. Age is upper Eocene.
Type section: in west limb of Pacheco syncline in cut along Industrial Highway, east of Alhambra Valley, and in cuts along Santa Fe RR, Contra Costa Co., northwestern CA. Forms crest of ridge in west limb from Martinez southward nearly to town of Walnut Creek. Also exposed in east limb of syncline.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1280).
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 ([ ]).