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Map showing publication footprint
  • Usage in publication:
    • San Miguel cherts†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • California Coast Ranges province
Publication:

Lawson, A.C., 1914, San Francisco folio, California, Tamalpais, San Francisco, Concord, San Mateo, and Hayward quadrangles: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-193, 24 p., scale 1:62,500


Summary:

[Named as formation in Franciscan group by Lawson (1902 in abstract, GSA Bull. v.13 p.544-545) evidently for San Miguel Hills in San Francisco Co, CA. Rocks of San Miguel Hills, which appear to be type locality, are mapped as Ingleside chert, Marin sandstone, and Sausalito chert (all new and of Franciscan group), thus in effect abandoning name "San Miguel"].

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 ([ ]).

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