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  • Usage in publication:
    • Pilarcitos sandstone
  • Modifications:
    • Not used
  • 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:

[Probably named for Pilarcitos Lake or Pilarcitos Creek, San Mateo Co, CA. Name Pilarcitos sandstone first used by Lawson (1902) in abstract as formation (790 ft thick) older than Calera limestone in Franciscan. Franciscan rocks along Pilarcitos Creek and Pilarcitos Lake are mapped as Cahil sandstone of which Calera is member in San Francisco folio. Thus in effect name "Pilarcitos" is abandoned.] Age of Franciscan group is given as Jurassic(?).

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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