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VILLA
NOVA F
AULT
ARROYO PARIDA - SANTA ANA FAULT
LA VISTA
FAULT
DEVIL’S GULCH F
AULT
OAK V
IEW F
AULTS
ARROYO PARIDA FAULT
SULPHUR MOUNTAIN FAULT
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CGSCGSSGS
A M PSUC
33
Point Hueneme
126
El RioCamarillo
Ventura
Saticoy
1
101 Santa Paula
Ojai
Oak View
150
Oxnard
FY 2003- 04
FY 2002- 03
Mapping completed under STATEMAP
White
Ledge Peak
Ventura
Oxnard
Mugu
Point
Pitas Point
Saticoy
Santa Paula
Camarillo
FY 2005- 06FY 2004- 05
Ojai
Santa
Paula Pk
Matilija
150
Sulphur
Springs
Miles
Kilometers
0 .5 1 2
0 .5 1 2
Contour Interval 40 FeetDotted Lines Represent Half-Interval Contours
Scale 1:24,000
0 1 2 3
Thousand FeetUTM GRID AND 1988 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET
1°18'23 MILS
14°249 MILS
GNMN
The bedrock geology is largely modified from Dibblee (1987).
Barnard, M., 1979, Geologic map of the Lake Casitas area in Geology of the Lake Casitas area, Ventura County,
California: Field trip guidebook, Coast Geological Society and Pacific Section, American Association of Petroleum
Geologists, 1979 Spring field trip, 57 p.
California Division of Mines and Geology, 1986, Earthquake Fault Zones, Matilija Quadrangle, Official Map of July 1,
1986, scale 1:24,000.
Clark, M.N., 1982, Tectonic geomorphology and neotectonics of the Ojai Valley and upper Ventura River: University of
California, Santa Barbara, M.S. thesis, 77 p., 5 plates, scale 1:24,000.
Dibblee, T.W., Jr., 1987. Geologic map of the Matilija Quadrangle, Ventura County, California: Dibblee Geological
Foundation Map DF-12, scale 1:24,000.
Earth Technology Corporation (ERTEC), 1981, Seismotectonic study for Casitas Dam and vicinity, Ventura County,
California: Report prepared by Ertec Western for U.S. Bureau of Reclamation, Contract No. 1-07-DV-0112, Ertec
Project No. 81-159, 96 p., 7 plates, scale 1:12,000.
Edwards, R.D., Rabey, 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.
Evans, J.R., Gray, C.H., Jr., Cleveland, G.B. and others, 1971, Analysis of mudslide risk in southern Ventura County,
California, in California Division of Mines and Geology, Open-File Report 72-23, Part 1, 83 p.; and Regional
Landslide Prediction, Part 2, 33 p.
Huftile, G.J., 1991a, Thin-skinned tectonics of the Upper Ojai Valley and Sulphur Mountain area, Ventura Basin,
California: American Association of Petroleum Geologists Bulletin, v. 75, no. 8, p. 1353-1373.
Huftile, G.J., 1991b, Displacement transfer between the Red Mountain and San Cayetano faults, in Active folding and
reverse faulting in the western Transverse Ranges, southern California: Field Trip Guidebook to accompany the
1991 Geological Society of America Annual Meeting, San Diego, California, October 20 to 24, 63 p.
Huftile, G.J. and Yeats, R.S., 1995, Convergence rates across a displacement transfer zone in the Western Transverse
Ranges, Ventura Basin, California: Journal of Geophysical Research, v. 100, no. B2, p. 2043-2067.
Huftile, G.J., 1988, Structural geology of the Upper Ojai Valley and Chaffee Canyon areas, Ventura County, California:
Oregon State University, M.S. thesis, 103 p.
Kahle, J.E., 1985, The San Cayetano Fault and related flexural-slip faults near Ojai and Santa Paula, Ventura County,
California: California Division of Mines and Geology, Fault Evaluation Report FER-174 and Supplement # 1 (1986).
Keller, E.A., Johnson, D.L., Clark, M.N. and Rockwell, T.K., 1982, Tectonic geomorphology and earthquake hazard
north flank, central Ventura Basin, California: U.S. Geological Survey Open-File Report 81-376, 178 p., plate 1,
scale 1:24,000.
Keller, E.A., Rockwell, T.K., Clark, M.N., Dembroft, G.E and Johnson, D.L., 1982, Tectonic geomorphology of the
Ventura, Ojai and Santa Paula areas, Western Transverse Ranges, California: Geological Society of America
Cordilleran Section, field guide.
Kerr, P.F. and Schenck, H.G., 1928, Significance of the Matilija overturn: Geological Society of America Bulletin, v. 39,
p. 1087-1101.
Morton, D.M., 1973, Reconnaissance photo-interpretation map of major landslides, southern Ventura County,
California: California Division of Mines and Geology Preliminary Report 14, plate 5, scale 1:48,000.
Morton, D.M., 1976, Reconnaissance surficial geologic map of the Ojai 7.5-minute quadrangle, Ventura County,
California: U.S. Geological Survey Open-File Report 76-212, scale 1:24,000.
Moser, F.G. and Frizzell, V.A., Jr., 1983, Geologic map of the Lion Canyon, Matilija, Ojai, Wheeler Springs and White
Ledge Peak quadrangles, California: U.S. Geological Survey, Open File Report 82-818A, scale 1:50,000.
Namson, J. and Davis, T., 1988, Structural transect of the western Transverse Ranges, California: Implications for
lithospheric kinematics and seismic risk evaluation: Geology, v. 16, p. 675-679.
Rockwell, T.K., 1988, Neotectonics of the San Cayetano Fault, Transverse Ranges, California: Geological Society of
America Bulletin, v. 100, p. 500-513.
Rockwell, T.K., 1983, Soil chronology, geology, and neotectonics of the north central Ventura basin, University of
California, Santa Barbara, Ph.D. thesis, 424 p., scale 1:24,000.
Rockwell, T.K., Johnson, D.L., Keller, E.A., and Dembroff, G.R., 1985, A late Pleistocene-Holocene soil
chronosequence in the central Ventura Basin, southern California, U.S.A., in Richards, K., Arnett, R., and Ellis, S.,
editors, Geomorphology and soils: London, England, George Allen and Unwin, p. 309-327.
Wilson, R.J., Jones, T.A., and Barrows, A.G., 2001, Earthquake-induced landslide zones in the Matilija 7.5-minute
quadrangle, Ventura County, California: California Geological Survey, Seismic Hazard Zone Report 064, Section 2,
p. 21-51.
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 of southern Ventura County, California: California Division of Mines and Geology Preliminary
Report 14, 102 p., plate 1, geologic map of southern Ventura County, California, scale 1:48,000.
Weber, F.H., Jr., Kiessling, E.W., Sprotte, E.C., Johnson, J.A., Sherburne, R.W. and Cleveland, G.B., 1975, Seismic
hazards study of Ventura County, California: California Division of Mines and Geology Open-File Report 76-05,
plates 5A and 5B, scale 1:48,000.
William Lettis and Associates, 2001, Preliminary digital Quaternary geologic map of the Matilija 7.5-minute quadrangle,
California, digitized at scale of 1:24,000.
Yeats, R.S., 1976, Neogene tectonics of the central Ventura basin, California: Society of Economic Paleontologists and
Mineralogists, Pacific Section, The Neogene Symposium, p. 19-32.
Yeats, R.S., 1983, Large-scale Quaternary detachments in Ventura Basin, Southern California: Journal of Geophysical
Research, v. 89, no. 62, p. 569-583.
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.
Yeats, R.S., Huftile, G.J. and Stitt, L.T., 1994, Late Cenozoic tectonics of the east Ventura basin, Transverse Ranges,
California: American Association of Petroleum Geologists Bulletin, v. 7, p. 1040-1074.
References
Copyright © 2006 by the California Department of Conservation
California Geological Survey. All rights reserved. No part of
this publication may be reproduced without written consent of the
California Geological Survey.
"The Department of Conservation makes no warranties as to the
suitability of this product for any given purpose."
STATE OF CALIFORNIA - ARNOLD SCHWARZENEGGER, GOVERNOR
THE RESOURCES AGENCY - MIKE CHRISMAN, SECRETARY FOR RESOURCES
DEPARTMENT OF CONSERVATION - BRIDGETT LUTHER, DIRECTOR
CALIFORNIA GEOLOGICAL SURVEY
JOHN G. PARRISH, Ph.D., STATE GEOLOGIST
119o15'00"
34o22'30"
119o15'00"
34o30'00"
119o22'30"
34o22'30"
119o22'30"
34o30'00"
Prepared in cooperation with the U.S. Geological Survey,
Southern California Areal Mapping Project GEOLOGIC MAP OF THE
MATILIJA 7.5' QUADRANGLE
VENTURA COUNTY, CALIFORNIA: A DIGITAL DATABASE
VERSION 1.0
By
Siang S. Tan1 and Terry A. Jones1
Digital Database
by
Carlos I. Gutierrez2
2006
1. California Geological Survey, 888 South Figueroa Street, Suite 475, Los Angeles, CA 90017
2. California Geological Survey, 801 K Street, MS 12-32, Sacramento, CA 95814
Topographic base from U.S. Geological Survey
Matilija 7.5-minute Quadrangle, 1988
UTM projection, North American Datum 1927
This geologic map was funded in part by the
U.S. Geological Survey National Cooperative
Geologic Mapping Program, STATEMAP
Award no. 05HQAG0080
Symbol Explanation
Strike and dip of bedding.2525
Contact between map units - Dashed where approximately located or inferred;
dotted where concealed.
?Landslide - Arrows indicate principal direction of movement, queried where
existence is questionable; hachured where headscarp is mappable; some
geologic features are drawn within headscarp.
Axis of syncline - Approximately located; dotted where concealed.
Strike and dip of overturned bedding.2525
Axis of overturned syncline - Approximately located; dotted where concealed.
Vertical bedding.
Axis of anticline - Approximately located; dotted where concealed. Arrow
indicates direction of plunge.
Fault - Solid where accurately located; long dash where approximately located;
short dash where inferred; dotted where concealed; queried where location is
uncertain. U = upthrown block, D = downthrown block. Arrow and number
indicate direction and angle of dip of fault plane.
27
?
D
U
Unit Explanation
Active wash deposits within major river channels (Holocene) - Composed of
unconsolidated silt, sand and gravel.
Alluvial and colluvial deposits, undivided (Holocene) - Located on the floors of
valleys; includes active stream deposits in hill slope areas; composed of
unconsolidated sandy clay with some gravel.
Alluvial fan deposits (Holocene) - Deposited by streams emanating from mountain
canyons onto alluvial valley floors; deposits originate as debris flows, hyper-
concentrated mudflows, or braided stream flows; composed of moderately to
poorly sorted, and moderately to poorly bedded, sandy clay with some gravel.
Landslide deposits (Holocene to late Pleistocene) - Includes numerous active
landslides, composed of weathered, broken up rocks; extremely susceptible to
renewed landsliding, including their head scarp areas.
Pico Formation, undivided (Pliocene) - Composed of claystone, siltstone, and
sandstone; locally pebbly; generally susceptible to landsliding.
Alluvial deposits, undivided (late Pleistocene) - Consists of semi-consolidated silt,
sand, clay, and gravel.
Alluvial fan deposits (late to middle Pleistocene) - Semi-consolidated poorly sorted
gravel, boulder, sand, silt and clay; often form elevated, slightly tilted, terraces on
hill slope areas.
Sisquoc Shale (Pliocene-Miocene) - Silty shale and claystone; generally susceptible
to landsliding. Locally contains siliceous shale similar to the Monterey Formation.
Monterey Formation (middle and late Miocene) - Consists of siliceous and
diatomaceous shale and some sandstone and limestone; generally susceptible to
landsliding. Tml = lower section, containing punky thin-bedded shale; Tmu = upper
section, composed of platy brittle siliceous thin-bedded shale.
Rincon Shale (early Miocene) - Composed of shale and siltstone; generally
susceptible to landsliding.
Vaqueros Sandstone (early Miocene) - Consists of sandstone, locally calcareous.
Coldwater Sandstone (late Eocene) - Composed of hard arkosic sandstone with
siltstone and shale interbeds; locally reddish in color, similar to appearance of
Sespe Formation. Tcw-sh consists predominantly of shale.
Sespe Formation (Oligocene) - Composed of sandstone; locally pebbly, siltstone and
claystone; rocks are generally reddish in color.
Cozy Dell Shale (late Eocene) - Consists of micaceous shale with arkosic sandstone
interbeds; generally susceptible to landsliding.
Matilija Sandstone (middle to late Eocene) - Composed of hard arkosic sandstone
with micaceous shale interbeds.
Juncal Formation (early to middle Eocene) - Consists of micaceous shale with
arkosic sandstone interbeds; generally susceptible to landsliding.
Unnamed conglomerate (late Cretaceous) - Conglomerate with arkosic sandstone
and micaceous shale interbeds.
Qw
Qha
Qhf
Qls
Qpf
Qpa
Tp
Tsq
Tmu
Tml
Tr
Tv
Ts
Tma
Tcd
Tcw
Tcw-sh
Tj
Ku
Unit Correlation
Holocene
QUATERNARY
CENOZOIC
Qha
Tp
Tsq
TmuTml
Tr
Tv
Ts
Tma
Tcd
Tcw
Tj
Ku
Pleistocene
Pliocene
Miocene
Eocene
Oligocene
TERTIARY
CRETACEOUS MESOZOIC
Qpf
Qpa Qls
Tcw-sh
QhfQw
Revised: 11/06/2006
Preliminary Geologic Map available from:
http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm
