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Geologic Unit: Piuma
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  • Usage in publication:
    • Piuma Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Mudstone
  • AAPG geologic province:
    • Transverse Ranges province
Publication:

Yerkes, R.F., and Campbell, R.H., 1979, Stratigraphic nomenclature of the central Santa Monica Mountains, Los Angeles County, California, IN Contributions to stratigraphy, 1979: U.S. Geological Survey Bulletin, 1457-E, p. E1-E30.


Summary:

Named as member in uppermost part of Sespe Formation. Type locality designated as exposures in Piuma Road and at head of Carbon Canyon, NE/4 sec.21 T1S R17W, Santa Monica Mountains, east-central Malibu Beach quad, Los Angeles Co, CA. Consists of gray, grayish-red and olive-gray sandstone and sandstone-mudstone sequence. Is 342 m thick. Conformably overlies undivided Sespe Formation; intertongues with undivided Vaqueros Formation; conformably underlies Saddle Peak Member (new) (Topanga Canyon Formation). Is early Miocene age.

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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