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QUATERNARY

TERTIARY

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CORRELATION OF MAP UNITS

Ts

Qf

Qha Qht Qhf

Qoa

QpfQpa

Qpa Undivided alluvial deposits (Pleistocene) - Consists of consolidated silt, sand, clay, and gravel.

Qs Saugus Formation (Pleistocene) - Weakly consolidated sandstone, with locally abundant gravelly sand units, susceptible to landsliding.

Tp Undivided Pico Formation (Pliocene) - Composed of claystone, siltstone, and, sandstone, locally pebbly, generally susceptible to landsliding.

Ta Andesite sill (Yeats, 1964) - Composed of fractured volcanic breccia, andesite, silicified shale, sandstone and breccia.

Qlp Las Posas Formation (Pleistocene) - Weakly consolidated sandstone and siltstone, with some gravelly sand units, highly susceptible to landsliding.

Modelo Formation (Miocene) - Consists of siliceous and diatomaceous shale and some sandstone and limestone, generally susceptible to landsliding. Tmb= burnt rock of the Modelo Formation.

TmTmb

Vaqueros Sandstone (early Miocene) - Sandstone, locally calcareous.Tv

Ts Sespe Formation (Oligocene) - Sandstone, locally pebbly, with some siltstone and claystone.

Qpf Undivided fan deposits (Pleistocene) - Consists of consolidated clay sand, gravel, cobble and some boulder size material.

EXPLANATION OF MAP UNITS

Qw Wash deposits within major river channels (Holocene, historic) - Composed of unconsolidated silt, sand and gravel.

Alluvial deposits (Holocene) - Deposited as overbank material associated with unit Qw, recognized by scour and incised channeling features. Composed of unconsolidated, poorly sorted, clayey sand with some gravel. May include terrace deposits (Qht).

Qha

QhfyAlluvial fan deposits (latest Holocene) - Latest Holocene age is indicated by historical inundation or the presence of youthful braid bars and distributary channels, often deposits emanate from a point partway down the alluvial fan slope. Composed of moderately to poorly sorted and bedded gravel, sand, silt, and clay.

QhtStream terrace deposits (Holocene) - Deposited in point bar and overbank settings associated with the Santa Clara River. Composed of unconsolidated, poorly sorted, clayey sand and sandy clay with gravel.

Alluvial fan deposits (Holocene) - Includes active fan deposits, deposited by streams emanating from mountain canyons to the north onto the alluvial valley floor. Deposits originate as debrisflows, hyperconcentrated mudflows or braided stream flows. Composed of moderately to poorly sorted and moderately to poorly bedded sandy clay with some silt and gravel.

Qhf

QfAlluvial fan deposits (late Pleistocene to Holocene) - Deposited on gently sloping, relatively undissected alluvial surfaces where deposits might be of either late Pleistocene or Holocene age, composed of moderately to poorly sorted sand, gravel, silt , and clay.

Qsb Santa Barbara Formation (Pleistocene) - Claystone, locally contains Monterey Formation shalefragments, highly susceptible to landsliding.

Qls Landslide deposits (Holocene to Pleistocene) - Includes numerous active landslides. Composed of weathered broken up rocks and soil, extremely susceptible to renewed landsliding.

QoaAlluvial deposits (early to middle Pleistocene) - Moderately to deeply dissected undifferentiated alluvial deposits where topography often consists of gently rolling hills with little or none of the original planar surface preserved, or tilted surfaces along active range fronts. Composed of moderately to poorly sorted and bedded gravel, sand, silt, and clay.

The bedrock geology of the present map is largely modified from Irvine (1995) and Dibblee (1992).

Bailey, T.L., 1951, Geology of a portion of the Ventura Basin, Los Angeles and Ventura counties, California: unpublished map; scale: 1:48,000.

Bentor, Y.L., Kastner, M., Perlman, I., and Yellin, Y., 1981, Combustion metamorphism of bituminous sediments and the formation of melts of granite and sedimentary composition: Geochimica et Cosmochimica Acta 45 (11), p. 2229-2256.

Cavan, W.F., Jr., Pacal, R.M., and Quinn, J.P., 1991, A case study in landslide remediation: Ramona Drive, northwestern Camarillo Hills in Engineering geology along the Simi-Santa Rosa fault system and adjacent areas, Simi Valley to Camarillo, Ventura County, California: Association of Engineering Geologists - Southern California Section, 1991 Annual Field Trip Guidebook, Volume 2, p. 316-332.

Dibblee, T.W., Jr., 1992, Geologic map of the Santa Paula quadrangle, Ventura County, California: Dibblee Geological Foundation Map DF-41, scale 1:24,000.

Edwards, R.D., Tabey, D.F. and Kover, R.W., 1970, Soil survey of the Ventura area, California: U.S. Department of Agriculture, Soil Conservation Services, 151 p., scale 1:24,000.

Gorian and Associates, Inc., 1987, Geotechnical investigation and detailed slope stability evaluation, tentative Tract 4222, Camarillo Hills, Ventura County, California: unpublished consultant report and geotechnical map dated September 21, Work Order 1706-1-11.

Hitchcock, C.S., Helms, J.D., Lindvall, S.C., Randolph, C.E., Weaver, K.D., and Lettis, W.R., 2000, Liquefaction hazard mapping, Ventura County, California: Final Technical Report, U.S. Geological Survey, Award 99-HQ-GR-0117, 21p., 4 plates.

Howard, J.L., 1987, Paleoenvironment, provenance, and tectonic implications of the Sespe Formation, southern California: University of California, Santa Barbara, Ph.D. dissertation, 306 p.

Irvine, P.J., 1995, Landslide hazards in the Moorpark and Santa Paula quadrangles, Ventura County, California: California Division of Mines and Geology Open-File Report 95-07, Plate C, scale 1:24,000.

Jakes, M.C., 1979, Surface and subsurface geology of the Camarillo and Las Posas Hills area, California: Oregon State University, M.S. thesis, 105 p.

Lung, R., 1958, Geology of the South Mountain area, Ventura County, California: University of California, Los Angeles, M.A. thesis, 83 p.

Morton, D.M. 1976, Reconnaissance surficial geologic map of the Santa Paula, Santa Paula Peak, Saticoy and Ojai 7.5' quadrangles, Ventura County, California: U.S. Geological Survey Open-File Report 76-212. sheet no. 1, scale 1:24,000.

Pasta, D., 1958, Geology of the Las Posas-Camarillo Hills area, Ventura County, California: University of California, Los Angeles, M.S. thesis,

59 p.

REFERENCES

Prentice, C.D., and Blake, T.F., 1991, Landslide exploration, western end of South Mountain, Ventura County, California, in Engineering geology along the Simi-Santa Rosa fault system and adjacent areas, Simi Valley to Camarillo, Ventura County, California: Association of Engineering Geologists-Southern California Section, 1991 Annual Field Trip Guidebook, Volume 2, p. 303-315.

Pressler, E.D., 1929, The Fernando Group in the Las Posas-South Mountain District, Ventura County, California: University of California Publications, Bulletin of the Department of Geological Sciences, v.18, no. 13, pp. 325-345.

Rieser, R.B., 1976, Structural study of the Oak Ridge fault between South Mountain and Wiley Canyon, Ventura County, California: Ohio University, M.S. thesis.

Silva, M.A. and Irvine, P.J., 2002, Earthquake-induced landslide zones in the Santa Paula 7.5-minute quadrangle, Ventura County, California:

California Geological Survey, Seismic Hazard Zone Report 061, Section 2, p. 21-39.

Treiman, J.A., 1990, Fault evaluation report, Oak Ridge and related faults, vicinity of Fillmore and Santa Paula, Ventura County, California: California Division of Mines and Geology, Fault Evaluation Report FER-219, 10 p.

Treiman, J.A., 1997, Springville, Camarillo and related faults in the Camarillo and Santa Paula quadrangles, Ventura County, California: Division of Mines and Geology, Fault Evaluation Report FER-237, 32 p.

Turner, D.L. and Campbell, R.H., 1979, Age of the Conejo Volcanics, in Yerkes, R.F., and Campbell, R.H., Stratigraphic nomenclature on the central Santa Monica Mountains, Los Angeles County, California: U.S. Geological Survey Bulletin 1457-E, p. 17-22.

Weber, F.H., Jr., Cleveland, G.B., Kahle, J.E., Kiessling, E.W., Miller, R.V., Mills, M.F., and Morton, D.M., 1973, Geology and mineral resources study of southern Ventura County, California: California Division of Mines and Geology, Preliminary Report 14, 102 p.

Williams, R.E., 1977, Miocene volcanism in the central Conejo Hills, Ventura County, California: University of California, Santa Barbara, M.A. thesis, 117 p.

Winterer, E.L., and Durham, D.L., 1962, Geology of southeastern Ventura Basin, Los Angeles County, California: U.S. Geological Survey Professional Paper 334-H, p. 275-366.

Yeats, R.S., 1964, Andesite sill at South Mountain oil field, Ventura County, California: Geological Society of America Special Paper No. 76, Abstracts for 1963 Meeting in Berkeley.

Yeats, R.S., 1965, Pliocene seaknoll at South Mountain, Ventura Basin, California: American Association of Petroleum Geologists Bulletin, v. 49, no. 5, p. 526-546

Yeats, R.S., 1989, Oak Ridge Fault, Ventura Basin, California, slip rates and late Quaternary history: U.S. Geological Survey Open-File Report 89-343, 30 p., 6 plates.

Yeats, R.S., Huftile, G.J., and Grigsby, F.B., 1988, Oak Ridge fault, Ventura fold belt, and the Sisar decollement, Ventura basin, California: Geology, v. 16, p. 1112-1116.

CGSCGSSGSA M PSUC

MAP SYMBOLS

?

Erosional scarps of incised river terraces along the Santa Clara River.

Upper boundary of ancient large-scale landslide complex (Irvine, 1995).

Strike and dip of bedding.

Strike and dip of overturned bedding.

Landslide - Arrows indicate principal direction of movement, queried whereexistence is questionable (some geologic features are drawn within questionablelandslides); hachured where headscarp is mappable. Headscarp includes geologic features where mappable.

Fault - Approximately located or inferred, dotted where concealed,queried where location is uncertain.

Contact between map units - Generally approximately located or inferred,dotted where concealed.

?

25

25

Axis of anticline - Dashed where approximately located, dotted where concealed; arrow indicates direction of plunge.

Axis of syncline - Solid where accurately located, dotted where concealed.

Contact between similar map units of different relative age - Recognized by scour and incised channelling features. Generally approximately located.

0 .5 1 2Miles

Kilometers0 .5 1 2

Contour Interval 20 FeetDotted lines represent half-interval contours

0 1 2 3Thousand Feet

GNMN

1°18'23 MILS

15½°276 MILS

UTM GRID AND 1967 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET

33

Point Hueneme

126

El Rio Camarillo

Ventura

Saticoy

1

101

150

Sulphur Springs

Santa Paula

Ojai

Oak View

150

Oxnard

Mapping completed under STATEMAP

FY 2002- 03

FY 2003- 04

White

Ledge Peak

Ventura

Oxnard

Mugu

Point

Pitas Point

Saticoy

Santa Paula

Camarillo

Prepared in cooperation with the U.S. Geological Survey, Southern California Areal Mapping Project

STATE OF CALIFORNIA - ARNOLD SCHWARZENEGGER, GOVERNORTHE RESOURCES AGENCY - MICHAEL CHRISMAN, SECRETARY FOR RESOURCES

DEPARTMENT OF CONSERVATION - DARRYL YOUNG, DIRECTORCALIFORNIA GEOLOGICAL SURVEYMICHAEL S. REICHLE, ACTING STATE GEOLOGIST

Topographic base from the U.S. Geological Survey UTM Projection, zone 11,North American Datum 1927

Copyright © 2004 by the California Department of ConservationCalifornia Geological Survey. All rights reserved. No part ofthis publication may be reproduced without written consent of theCalifornia Geological Survey.

"The Department of Conservation makes no warranties as to thesuitability of this product for any given purpose."

119°07'30"

119°07'3034°22'30"

119°00'00" 34°15'00" 34°15'00"

119°00'00"34°22'30"

This geologic map was funded in part by the USGS National Cooperative Geologic MappingProgram, Statemap Award no. 03HQAG0085

1. California Geological Survey, 655 S. Hope St. #700, Los Angeles, CA 90017 2. California Geological Survey, 185 Berry St., Ste, 210, San Francisco, CA 941073. California Geological Survey, 801 K St., MS 12-32, Sacramento, CA 95814

GEOLOGIC MAP OF THE SANTA PAULA 7.5' QUADRANGLE

VENTURA COUNTY, CALIFORNIA: A DIGITAL DATABASE

VERSION 1.0By

Siang S. Tan1, Kevin B. Clahan2, and Pamela J. Irvine1

Digital Database by:Marina T. Mascorro and Carlos I. Gutierrez

2004

2 3