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Geologic Unit: Alcalde
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  • Usage in publication:
    • Alcalde shale
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Sacramento basin
Publication:

Goudkoff, P.P., 1945, Stratigraphic relations of Upper Cretaceous in Great Valley, California: American Association of Petroleum Geologists Bulletin, v. 29, no. 7, p. 956-1007. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Pg. 962 (fig. 2), 991. Panoche group (or formation) is subdivided into 10 units. Alcalde shale is seventh in sequence (ascending). Underlies Joaquin Ridge sandstone (new); overlies Los Gatos sandstone. Name credited to J.Q. Anderson. Assigned to Cachenian stage (new). [Age is Late Cretaceous.]
[Type locality not stated. Occurs in Alcalde Hills, Coalinga-Ortigalito area, San Joaquin Valley, west-central CA.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 44).


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 ([ ]).

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