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Map showing publication footprint
  • Usage in publication:
    • Griffith Canyon Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Basalt
    • Andesite
    • Breccia
  • AAPG geologic province:
    • Santa Maria basin
Publication:

Nolf, Bruce, and Nolf, Penny, 1969, Santa Cruz Island Volcanics, IN Weaver, D.W., Doerner, D.P., and Nolf, Bruce, eds., Geology of the northern Channel Islands, southern California borderland: American Association of Petroleum Geologists, Pacific Section, Field Trip Guidebook, [no. 12], p. 91-94, (incl. geologic map, scale 1:63,360)


Summary:

[Named] for small canyon at head of Canada Del Portezuelo. [Type area] extends approximately 13 mi along strike on north side of Santa Cruz Island fault, Santa Cruz Island, CA. Is oldest member of Santa Cruz Island Volcanics (new). [Authors say Santa Cruz Island Volcanics informally divided into members.] Composed of greenish-gray to brown basalt, andesitic flows, and breccia. Is about 1200 ft in surface outcrop and as much as 2500 ft thick in subsurface as inferred from log of Richfield No.1 Well on west end of Santa Cruz Island. Conformably overlies San Onofre Breccia; conformably underlies Stanton Ranch Member (new) (Santa Cruz Island Volcanics). Text states that no precise age is available for lower part of Santa Cruz Island Volcanics or time span of volcanic rocks, "but entire pile was presumably emplaced within Saucesian Stage of upper Oligocene and lower Miocene," p.94. Age on map shown as Miocene.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Griffith Canyon Member*
  • Modifications:
    • Adopted
  • AAPG geologic province:
    • Santa Maria basin
Publication:

Crowe, B.M., McLean, Hugh, Howell, D.G., and Higgins, R.E., 1976, Petrography and major-element chemistry of the Santa Cruz Island Volcanics, IN Howell, D.G., ed., Aspects of the geologic history of the California continental borderland: American Association of Petroleum Geologists, Pacific Section, Miscellaneous Publication, California Borderland Symposium, Santa Cruz Island, CA, September 22-26, 1975, no. 24, p. 196-215., Prepared in cooperation with USGS and Univ. California, Channel Islands Field Station


Summary:

Santa Cruz Island Volcanics (Nolf and Nolf, 1969) and its members (ascending); Griffith Canyon, Stanton Ranch, Devils Peak, and Prisoners Harbor are adopted. No ages have been determined from lower part of Santa Cruz Island Volcanics; however volcanic rocks are underlain by probable Saucesian-age San Onofre Breccia (Weaver and Myers, 1969). Shown on generalized geologic sketch map of north-central Santa Cruz Island as of Tertiary 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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