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  • Usage in publication:
    • "Blue Ridge Member"
  • Modifications:
    • First used
  • Dominant lithology:
    • Arkose
    • Conglomerate
  • AAPG geologic province:
    • Sacramento basin
Publication:

Page, B.M., 1966, Geology of the Coast Ranges of California, IN Bailey, E.H., ed., Geology of northern California: California Division of Mines and Geology Bulletin, no. 190, p. 255-276.


Summary:

[Name proposed for the lower member of Crack Canyon Formation by Lawton (1956, PhD thesis) in Morgan-Wilbur area of Lake, Yolo, and Colusa Counties, CA]. Is composed of arkose and several conglomerate lenses. Composite columnar section of northern Great Valley sequence shows unit overlies "Knoxville Formation" and underlies "Grizzly Creek Member" of "Crack Canyon Formation" of Lawton (1956). Age is Early Cretaceous (Valanginian).

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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