GEOLEX

Summary of Citation: Conejo

Publication:
Taliaferro, N.L., 1924, Notes on the geology of Ventura County,
   California: American Association of Petroleum Geologists
   Bulletin, v. 8,, no. 6, p. 789-810

Usage in Publication:
Conejo volcanics

Modifications:	Geologic Province:	Dominant Lithology:
Named	Transverse Ranges province	Volcanics

Summary:
One of most important centers of Miocene volcanism in California lies in west end of Santa Monica Mountains, Ventura Co. This region often referred to as "Conejo Mountains". Name "Conejo volcanics" is here applied to all volcanic and intrusive rocks occurring in that region. These volcanic rocks and interbedded Miocene sedimentary deposits probably aggregate 15,000 ft in thickness.

Summary of Citation: Conejo

Publication:
Jenkins, O.P., 1949, Counties of California mineral resources
   and mineral production during 1947: California Division of
   Mines and Geology Bulletin, no. 142, 197 p.

Usage in Publication:
Conejo volcanics

Modifications:	Geologic Province:	Dominant Lithology:
	Transverse Ranges province

Summary:
Conejo volcanics is unique in that small oil field is located therein. Unit is composed of basalt flows and pyroclastics with minor basalt and andesite dikes. Overlies olivine basalt which in turn overlies Topanga formation.

Summary of Citation: Conejo

Publication:
Kennett, W.E., 1952, Channel Islands [columns], IN Redwine,
   L.E., chairperson, Cenozoic correlation section paralleling
   north and south margins, western Ventura basin, from Point
   Conception to Ventura and Channel Islands, California [No.
   5]; Sheet 2: American Association of Petroleum Geologists,
   Pacific Section, 1 sheet, Prepared by Geologic Names and
   Correlations Committee, and Subcommittee on the Cenozoic.

Usage in Publication:
Conejo volcanics

Modifications:	Geologic Province:	Dominant Lithology:
Areal limits	Ventura basin

Summary:
On San Miguel Island described as 2500 ft of orange-brown to dark brown, moderately soft, massive to poorly bedded, basaltic tuffs, silts, sands, and fine breccia, andesitic flows and agglomerate in upper part in Cuyler Harbor area. On Santa Rosa Island described as 2900 ft of basaltic pyroclastics as on San Miguel Island with occasional basalt dikes, silts and flows. Near top surface are thin zones of buff, siliceous and tuffaceous shales with fossiliferous sandstones containing foraminifers. "Lower part of this formation may be Saucesian and therefore these volcanics may represent a part of Rincon" (L.E. Redwine). Overlies Rincon formation. Disconformably underlies Monterey formation.

Summary of Citation: Conejo

Publication:
Blackerby, B.A., 1965, The Conejo Volcanics (Miocene) in the
   Malibu Lake area of the western Santa Monica Mountains, Los
   Angeles County, California: Dissertation Abstracts, v. 25,
   no. 12, pt. 1, p. 7199

Usage in Publication:
Conejo Volcanics

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Transverse Ranges province

Summary:
Mapping of Conejo Volcanics in Boney Mountains and Santa Monica Mountains may be facilitated by recognition of few characteristic members such as Boney member (of Sonnemann, 1956) and corresponding Malibu Junction member in Malibu Lake area.

Summary of Citation: Conejo

Publication:
Greene, H.G., 1976, Late Cenozoic geology of the Ventura basin,
   California, IN Howell, D.G., ed., Aspects of the geologic
   history of the California continental borderland: American
   Association of Petroleum Geologists, Pacific Section,
   Miscellaneous Publication, no. 24, California Borderland
   Symposium, Santa Cruz Island, CA, September 22-26, 1975, p.
   499-529, Prepared in cooperation with the U.S. Geological
   Survey and the University of California, Channel Islands
   Field Station.

Usage in Publication:
Conejo Volcanics*

Modifications:	Geologic Province:	Dominant Lithology:
Adopted Age modified	Ventura basin

Summary:
In Ventura basin offshore area, middle Miocene Conejo Volcanics form an acoustic marker. In middle Miocene(?) time erosional surface appears to have developed on surface of Conejo Volcanics in eastern Santa Barbara basin, especially along Anacapa ridge. It appears as an irregular surface unconformably in contact with overlying Monterey Shale. However, on Santa Cruz Island, where top surface of unit is exposed, it is an irregular nonconformable surface with no evidence of erosional truncation. In Oxnard Plain area overlies Topanga (Temblor?) Formation.

Summary of Citation: Conejo

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

Usage in Publication:
Conejo Volcanics*

Modifications:	Geologic Province:	Dominant Lithology:
Revised	Transverse Ranges province

Summary:
Assigned as middle of three formations to Topanga Group. In upper plate of Malibu fault, unit is divided into three tongues which are complexly interbedded with members of Calabasas Formation. Tongues are (ascending): Ramera Canyon, Soltice Canyon, and Malibu Bowl (all new). Conejo Volcanics rests accordantly on Topanga Formation and locally on Vaqueros Formation. Age is middle Miocene on basis of stratigraphic relations, radiometric age (Turner, 1970), and sparse fauna.