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  • Usage in publication:
    • "Grizzly Creek Member"
  • Modifications:
    • First used
  • Dominant lithology:
    • Mudstone
    • Arkose
  • 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:

[Named as upper member of Crack Canyon Formation by Lawton (1956, PhD thesis) in Morgan-Wilbur area in Lake, Yolo, and Colusa Cos, CA]. Composed of mudstone with minor arkose. Composite columnar section of northern Great Valley sequence shows unit overlies "Blue Ridge Member" of "Crack Canyon Formation" and underlies "Leesville Member" of "Little Valley Formation" of Lawton (1956). Age given as 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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