GEOLOGIC MAP OF THE SANTA PAULA PEAK 7.5' QUADRANGLE ... · Santa Paula Ojai Oak View 150 Oxnard FY...
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U D U U D D U D U D D U U D 18 12 21 15 23 19 10 11 20 27 10 10 8 9 11 12 8 88 61 80 52 88 71 13 12 62 69 60 72 50 53 54 59 61 51 53 51 10 10 60 64 53 65 66 51 61 70 68 75 65 7 8 11 12 12 10 10 8 27 26 22 15 15 17 15 16 12 36 26 72 21 25 32 76 68 31 71 65 82 67 78 87 68 82 70 59 61 62 64 55 62 50 35 75 75 68 87 10 13 75 70 70 58 53 71 46 40 36 85 35 51 44 45 72 83 80 50 87 52 71 51 62 54 46 44 45 42 22 74 77 71 61 64 69 35 68 70 53 51 31 41 34 14 26 49 61 53 52 71 41 61 80 61 59 72 87 47 57 57 74 59 64 54 66 61 74 74 64 62 63 71 71 81 53 52 71 70 61 60 61 60 58 55 57 54 52 41 59 78 48 50 56 47 62 74 56 55 75 77 75 74 47 75 59 59 32 33 52 72 46 70 34 33 51 56 40 52 54 25 43 53 45 87 25 59 82 41 65 43 85 59 55 55 45 9 8 15 14 13 7 13 11 8 10 15 14 10 9 9 8 14 13 15 13 10 12 11 15 11 15 14 10 10 16 15 22 17 13 15 11 13 17 13 17 14 20 25 14 16 24 15 26 52 15 35 66 54 53 52 20 25 47 52 27 31 25 75 22 21 28 27 20 25 50 53 26 28 40 30 25 25 20 30 25 25 21 32 27 60 35 20 19 17 20 22 35 25 67 45 41 10 72 27 18 21 39 22 38 86 24 25 71 66 50 51 46 68 36 53 60 55 66 56 57 67 61 54 62 63 61 71 45 45 51 41 64 50 58 55 14 87 81 61 65 62 64 32 84 87 87 80 60 57 56 51 72 87 70 64 69 70 64 59 69 62 76 77 78 79 82 88 76 88 60 68 62 58 62 55 78 59 77 62 70 51 69 72 62 87 75 12 15 31 61 30 14 12 40 50 55 21 61 70 72 51 65 52 85 67 66 75 54 30 44 45 42 45 57 51 58 50 82 46 40 62 52 68 81 74 87 60 61 66 78 51 50 76 51 50 40 45 81 15 45 70 Qls Qls Tcw Qls? 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Tcd Tcd Tcd Tmu Tmu Tmu Tml 33 Point Hueneme 126 El Rio Camarillo Ventura Saticoy 1 101 150 Sulphur Springs Santa Paula Ojai Oak View 150 Oxnard FY 2004- 05 FY 2003- 04 FY 2002- 03 Mapping completed under STATEMAP White Ledge Peak Ventura Oxnard Mugu Point Pitas Point Saticoy Santa Paula Santa Paula Pk Camarillo Ojai 0 .5 1 2 Miles Kilometers 0 .5 1 2 Contour Interval 40 Feet Scale 1:24,000 0 1 2 3 Thousand Feet UTM GRID AND 1988 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET 1°10' 21 MILS 14° 249 MILS GN MN The bedrock geology of this map is largely modified from Dibblee (1990). California Department of Conservation, Division of Mines and Geology, 1986, Official Map of Earthquake Fault Zones, Santa Paula Peak Quadrangle, scale 1:24,000. Dibblee, T.W., Jr., 1990, Geologic map of the Santa Paula Peak Quadrangle, Ventura County, California: Dibblee Geological Foundation Map DF-26, scale 1:24,000. 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. 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 Range, 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 geologic map, scale 1:24,000. Keller, E.A., Rockwell, T.K., Clark, M.N., Dembroff, G.R. 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. 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 Santa Paula Peak 7.5' Quadrangle, Ventura County, California: U.S. Geological Survey Open-File Report 76-212, scale 1:24,000. 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., Arnet, R., and Ellis, S., eds., Geomorphology and soils: London, England, George Allen and Unwin, p. 309-327. Tan, S.S., 1998. Slope failure and erosion assessment of the fire areas at Fillmore (April 1996) and Piru (August 1997), Ventura County, California: California Division of Mines and Geology, Open File Report 98-32, map scale 1:24,000. Wilson, R.J. and Irvine, P.J., 2003, Earthquake-induced landslides in the Santa Paula Peak 7.5 minute quadrangle, Ventura County, California: California Geological Survey, Seismic Hazard Zone Report 075, section 2, p. 19-51. 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, 2000, Preliminary digital Quaternary geologic map of the Santa Paula Peak 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 Tectonic 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. 88, no. B1, 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.J., 1994, Late Cenozoic tectonics of the east Ventura Basin, Transverse Ranges, California: American Association of Petroleum Geologists Bulletin, v. 78, p. 1040-1074. References Copyright © 2005 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." This geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program, Statemap Award no. 04HQAG0074 STATE OF CALIFORNIA - ARNOLD SCHWARZENEGGER, GOVERNOR THE RESOURCES AGENCY - MICHAEL CHRISMAN, SECRETARY FOR RESOURCES DEPARTMENT OF CONSERVATION - BRIDGETT LUTHER THOMPSON, DIRECTOR CALIFORNIA GEOLOGICAL SURVEY JOHN G. PARRISH, PhD., STATE GEOLOGIST 119 o 00'00" 34 o 22'30" 119 o 00'00" 34 o 30'00" 119 o 07'30" 34 o 22'30" 119 o 07'30" 34 o 30'00" Prepared in cooperation with the U.S. Geological Survey, Southern California Areal Mapping Project GEOLOGIC MAP OF THE SANTA PAULA PEAK 7.5' QUADRANGLE VENTURA COUNTY, CALIFORNIA: A DIGITAL DATABASE VERSION 1.0 By Siang S. Tan 1 and Pamela J. Irvine 1 Digital Database by: Carlos I. Gutierrez 2 2005 1. California Geological Survey, 655 Hope Street #700, Los Angeles, CA 90017 2. California Geological Survey, 801 K Street, MS-32, Sacramento, CA 95814 Topographic base from the U.S. Geological Survey Polyconic Projection, North American Datum 1927 Symbol Explanation Strike and dip of bedding. 25 25 Contact between map units - Generally approximately located or inferred; dotted where concealed. ? Landslide - Arrows indicate principal direction of movement, queried where existence is questionable (some geologic features are drawn within questionable landslides); hachured where headscarp is mappable. Axis of anticline - Approximately located; dotted where concealed. Axis of syncline - Approximately located; dotted where concealed. Strike and dip of overturned bedding. 25 25 Axis of overturned syncline - Approximately located; dotted where concealed. Axis of overturned anticline - Approximately located; dotted where concealed. Fault - Approximately located or 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 Qs Saugus Formation (early to middle Pleistocene) - Semi-indurated sandy conglomerates with sandstone and shale interbeds. Contains abundant cobble-boulder sized clasts. Locally susceptible to landsliding. Qlp Las Posas Formation (early Pleistocene) - Semi-indurated sandstone and siltstone with lenses of pebble-cobble conglomerate. Santa Barbara Claystone Formation (Early Pleistocene) - Poorly bedded soft claystone/mudstone with local sandstone and conglomerate lenses; highly susceptible to landsliding. Also known as the Mudpit Claystone. Qsb Unit Explanation Qw 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. Qhf Qls Landslide deposits (Holocene to late Pleistocene) - Includes numerous active landslides; composed of weathered, broken up rocks; extremely susceptible to renewed landsliding, including their headscarp areas. Tp 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. Qpa Alluvial fan deposits (late to middle Pleistocene) - Semi-consolodated, poorly sorted boulder, gravel, sand, silt, and clay; often form elevated, slightly tilted, terraces on hill slope areas. Subscript 1 indicates higher (older) level than subscript 2. Qpf Tsq Sisquoc Shale (Pliocene to Miocene) - Silty shale and claystone; generally susceptible to landsliding. Tmu Tml 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. Ts Sespe Formation (Oligocene) - composed of sandstone; locally pebbly siltstone and claystone; rocks are generally reddish in color. Tcw Coldwater Sandstone Formation (late Eocene) - Composed of hard arkosic sandstone with siltstone and shale interbeds. Tcd Cozy Dell Formation (late Eocene) - Consists of micaceous shale with arkosic sandstone interbeds: generally susceptible to landsliding. Tma Tmash Matilija Sandstone Formation (middle to late Eocene) - composed of hard arkosic sandstone with micaceous shale interbeds. Tmash consists predominately of micaceous shale with thin sandstone interbeds. Tj Juncal Formation (early to middle Eocene) - consists of micaceous shale with arkosic sandstone interbeds; generally susceptible to landsliding. Qha Qpf1 Qpf2 Unit Correlation Holocene QUATERNARY CENOZOIC Qha Qw Tp Qsb Qlp Qs Qpf Tsq Tmu Tml Ts Tcw Tcd Tma Tj Qhf Pleistocene Pliocene Miocene Eocene Oligocene TERTIARY Qpa Qpf1 Qpf2 Qls Tmash
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Qls
Tp
Qls
Qls
QlsQls
Tp
Qls Qls
Qpf1
Qls
Qpa
QlsQls
Qls
Tp
Tp
Tp
Qpa
Qha Qpf2
Qsb
QlsQpf1Tp
Qpf2
QlsTp
Qls
Qpf1
Qsb
Qls
Qha
Qls
Qls
Qls
Tp
QfTp
Qsb
Qpf2
Qpa
Qpf2
Qpf1
Qf
QsQls
TpQls?
Tp
Qhfy
Qpf1Tp
Tp
Tp
Qsb
Tp
Qsb
Qha
QsbTpTp
QlsQpa
Qls
Qhf
Tj
Qls
Qls
Qls
Qls
Qls
Qha
Tj
Qls
Qls
Tma
Qls
Qw
Qls?
Qls
TjQls?
Qls
Qls
Tmash
Tj
Qls
Qw
Tcw
Qhf
Qw
Qw
Tcw
Tcd
Qpa
Tp
Qls?Qpa
Qls?Qhf
Qls?
Tp Qls?
Qls?Qha
Qpa
Qpa
Qpf
Qhf
Tp
Qls
Qls
Tmu
Qls
Qls
QwQw
Qls Qls
Qls
Qls
QhaQha
Qls?
Qls Qw
Qha
Qls
TpQls
Qls
Qls
Tp
Qls
Qls
Qls
Qls
QlsQls
Tp
TpTp
Qls?
Qls Qls
Qls
Qls
Qls Qls
Qls
Qls
Qls
Qls
Qls?Qls
QlsQls
Qls
QlsQls
Qls
TpQls?
Tp
Qls
Qls
Tp
Tp
Tp
Qls
Qls
Qls?
Qls
Qls?Qls
Qls
QlsQls
Qls
Qls
Qls
Qls
Qls
Qls
Qls
Qls
Qls Qls
Qls Qls
Qls QlsTp
Qls
Qls
Qls
Qls
Qls
Qls
Qls
Qls
Qls
QlsTpQha
Tp
QlsQls
QlsQls
Tp
Qls
Qls Qsb
Qls
Qls?
Qls? Qsb
Qls
Qha
Qls
QsbQls
Qls
Qls
Qls
Qls
Qls
QlsQls
Qsb
Qls
Qls
QsbQlsQls
Qls
Qls
Qsb
Qls?Qls
Qls
Qls
Qha
Qls
QsbQls
Qls
Qls
Qls
QsbQsb
Qls
Qls
Qls
Qls
Qsb
Qls
Qls Qls
Qls
Qls
Qls?
Qls?
Qls
Qls
Qls
Qha
Tp
Tp
Tp
Tp
Qls
Qls
Qsb
Qls
Qls
Qls
Qls
Qha
Qls Qls
Qls
Qls
Qls
Qls
Qls
Qls?
Qls
Qls
Qls?
Qls?
Qpa
QlsTpTp
Qha
Qpf2
Qls
Tsq
Qls
Tp
Qls
Qls
QlsQls
Qls?
Qls?
Tcw
Qls?
Qls?
Tmu
QlsQls?
Qls?
Qw
Qha
Tcd
Qls
Qls?
Qls?
Qha
Qls
Qls
Qls?
Qls Qls
Qls?
Qls?
Qls?
Qls?
Qls
Qls Tmash
Qls?
Qls
Qls
Qls?
Qls?
QlsTmash
Qls
Qls
Qls
QlsQls?Qls?
QlsQls Tmash
Qls?
Qls?
Qls?
Qls?
Qls?
Qls
Qls
Qls
Qls?
Tmash
Qw
Qls?
Tmash
Qls
Qls?
Qls?
Qls?
Qls?
Qls?
QlsQls?
QlsTma
Qls
Qls
Qls
Tcd
Qls?
QlsQls?
QlsQls
Qls
Qls Tsq
Qls Qls
Qls
Tp
Tma
Qpf1
Qpf2TpQls
Qls
QlsQls
Qls
Qls
QlsQls
Qls
Qls
TpQls
Qpf2
Qpf1
Qls
Qls
Qpf2Qw
Tp
Tp
Qls
Qls
Qls Qls
Qls
Tp
Tp
Tp
Qls Tp
Qls
Qls
Qls
Qsb
Qpf1
Qpf2
Qw
Qls Qls
QlsQls
Qls
Qpf2
Tp
Qls
Qls
Qpf2
Qls?
Qls
Qls?Qls?
Qpf2
Qpf2
Qhfy
Qw
Qoa
Qhf
Qpf2
Qpf2
Qpf2
Qw
Qf
Qpf1
Qpf1
Qsb
Qpf1
Qpf1
Qpf1Qs
Qlp
Qpf2
Qpf2
Qls
Qpf2
Qw
Qpf2
QlsQls
Qlp
Qls
Qls
Qsb
Qha
Qls Qw
Qpf2Qw
Qls?
Qls
TpQsb
Qpf2
Qw
Qf
Qf
Qsb
Qsb
Qls
TpQpf2 Tp
Qls
Qw
Qls
Qls
Qw
Qls
Qls
Qls
Tp
TpTma
Qls?
Qls?
Qpf2
Tma Qls?
Qls
Tma
Qls
Ts
Qls
Qls
Qls
Qls
Qpf1
QlsTp
Tcw
Tcd
Ts
Tma
Tmash
Tma
Tma
Tmash
Tma
Tma
Tma
Qpf
Tcd
Tcd
Tma
Qpa
Tp
Tp
Qha
Tp
Qsb
Qs
Qs
Qs
Qsb
Qf
Tma
QlsQw
Tmash
Tj
Tmash
Tcd
Tcd
Qpa
Tcd
Tcd Tma
Tcw
Tcw
Tcw
Tsq
Tsq
QlsQls
Qls
Qls
Tsq
Tsq
Qls
Qls?
Qsb
Qsb
Qsb
Qha
Qls
Qlp
Qls?
Qls?
Tmash
Tma
Tma
Tcw
Tma
Tmash
Tma
Qpa
Tmu
TpTp
Tp
Qw
Qlp
Qs
Qpf1
Qw
Qls
QhaQlp
Tp
Qls?Qls?
Qls?Qls?
Qls?
Qls?Qls?
Qls?
Qls?
Qls?
Qls?
Qls?
Qls?Qls?
Qls
Qls
Qls
Qls?
Qls?
Qls?
Qls?
Tp
Tsq
Qls?
Tcw
Tcw
Qls?
Qls?
Qpf
Qls
Qw
Tp
Qls?
Qls
Qls
Qls
Qsb
Qsb
Qls
Qls
Qpf2
Qls?
Qpf1
Qpf1
Qls?
Qls?
Qpf2
Qpf2
Qpf2
Qpf2
Qpf1
Qpf1
Tp
Qha
Qls
Tmu
Qls
Tcd
Qls
Tp
Qls
TmuTcwTmu
Tp
Qls?
Qha
TpQls?
Qs
Tp
Qw
Qls?
Tp
Tp
QlsQls
PINE
CANYON SYNCLINE
ECHO
CANYON
PAULA
SANTA
ANTICLINERIDGE
ANTICLINE
Tsq
FAULTSISAR
SAN
CAYETA NO
Qls FAULT
MOUNTAIN
SULPHUR
FAULT
TIMBER CANYON
FAULT
ORCUTT
FAULT
Qlp
Qpf1
FAULT
CULBERTSON.
Tcd
Tcd
Tcd
Tmu
Tmu
Tmu
Tml
33
Point Hueneme
126
El RioCamarillo
Ventura
Saticoy
1
101
150
Sulphur
Springs
Santa Paula
Ojai
Oak View
150
Oxnard
FY 2004- 05
FY 2003- 04
FY 2002- 03
Mapping completed under STATEMAP
White
Ledge Peak
Ventura
Oxnard
Mugu
Point
Pitas Point
Saticoy
Santa Paula
Santa
Paula Pk
Camarillo
Ojai
0 .5 1 2
Miles
Kilometers
0 .5 1 2
Contour Interval 40 Feet
Scale 1:24,000
0 1 2 3
Thousand FeetUTM GRID AND 1988 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET
1°10'21 MILS
14°249 MILS
GNMN
The bedrock geology of this map is largely modified from Dibblee (1990).
California Department of Conservation, Division of Mines and Geology, 1986, Official Map of Earthquake Fault Zones, Santa
Paula Peak Quadrangle, scale 1:24,000.
Dibblee, T.W., Jr., 1990, Geologic map of the Santa Paula Peak Quadrangle, Ventura County, California: Dibblee Geological
Foundation Map DF-26, scale 1:24,000.
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.
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 Range,
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 geologic map, scale
1:24,000.
Keller, E.A., Rockwell, T.K., Clark, M.N., Dembroff, G.R. 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.
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 Santa Paula Peak 7.5' Quadrangle, Ventura County,
California: U.S. Geological Survey Open-File Report 76-212, scale 1:24,000.
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., Arnet, R., and Ellis, S., eds., Geomorphology and soils:
London, England, George Allen and Unwin, p. 309-327.
Tan, S.S., 1998. Slope failure and erosion assessment of the fire areas at Fillmore (April 1996) and Piru (August 1997),
Ventura County, California: California Division of Mines and Geology, Open File Report 98-32, map scale 1:24,000.
Wilson, R.J. and Irvine, P.J., 2003, Earthquake-induced landslides in the Santa Paula Peak 7.5 minute quadrangle, Ventura
County, California: California Geological Survey, Seismic Hazard Zone Report 075, section 2, p. 19-51.
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, 2000, Preliminary digital Quaternary geologic map of the Santa Paula Peak 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 Tectonic 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. 88, no. B1, 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.J., 1994, Late Cenozoic tectonics of the east Ventura Basin, Transverse Ranges,
California: American Association of Petroleum Geologists Bulletin, v. 78, p. 1040-1074.
References
Copyright © 2005 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."
This geologic map was funded in part by the
USGS National Cooperative Geologic Mapping
Program, Statemap Award no. 04HQAG0074
STATE OF CALIFORNIA - ARNOLD SCHWARZENEGGER, GOVERNOR
THE RESOURCES AGENCY - MICHAEL CHRISMAN, SECRETARY FOR RESOURCES
DEPARTMENT OF CONSERVATION - BRIDGETT LUTHER THOMPSON, DIRECTOR
CALIFORNIA GEOLOGICAL SURVEY
JOHN G. PARRISH, PhD., STATE GEOLOGIST
119o00'00"
34o22'30"
119o00'00"
34o30'00"
119o07'30"
34o22'30"
119o07'30"
34o30'00"
Prepared in cooperation with the U.S. Geological Survey,
Southern California Areal Mapping Project
GEOLOGIC MAP OF THE
SANTA PAULA PEAK 7.5' QUADRANGLE
VENTURA COUNTY, CALIFORNIA: A DIGITAL DATABASE
VERSION 1.0
By
Siang S. Tan1 and Pamela J. Irvine1
Digital Database
by:
Carlos I. Gutierrez2
2005
1. California Geological Survey, 655 Hope Street #700, Los Angeles, CA 90017
2. California Geological Survey, 801 K Street, MS-32, Sacramento, CA 95814
Topographic base from
the U.S. Geological Survey
Polyconic Projection,
North American Datum 1927
Symbol Explanation
Strike and dip of bedding.2525
Contact between map units - Generally approximately located or inferred;
dotted where concealed.
?Landslide - Arrows indicate principal direction of movement, queried where
existence is questionable (some geologic features are drawn within
questionable landslides); hachured where headscarp is mappable.
Axis of anticline - Approximately located; dotted where concealed.
Axis of syncline - Approximately located; dotted where concealed.
Strike and dip of overturned bedding.2525
Axis of overturned syncline - Approximately located; dotted where concealed.
Axis of overturned anticline - Approximately located; dotted where concealed.
Fault - Approximately located or 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
Qs Saugus Formation (early to middle Pleistocene) - Semi-indurated sandy conglomerates
with sandstone and shale interbeds. Contains abundant cobble-boulder sized clasts.
Locally susceptible to landsliding.
Qlp Las Posas Formation (early Pleistocene) - Semi-indurated sandstone and siltstone with
lenses of pebble-cobble conglomerate.
Santa Barbara Claystone Formation (Early Pleistocene) - Poorly bedded soft
claystone/mudstone with local sandstone and conglomerate lenses; highly susceptible
to landsliding. Also known as the Mudpit Claystone.
Qsb
Unit Explanation
Qw 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.
Qhf
Qls Landslide deposits (Holocene to late Pleistocene) - Includes numerous active landslides;
composed of weathered, broken up rocks; extremely susceptible to renewed
landsliding, including their headscarp areas.
Tp 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.Qpa
Alluvial fan deposits (late to middle Pleistocene) - Semi-consolodated, poorly sorted
boulder, gravel, sand, silt, and clay; often form elevated, slightly tilted, terraces on hill
slope areas. Subscript 1 indicates higher (older) level than subscript 2.
Qpf
Tsq Sisquoc Shale (Pliocene to Miocene) - Silty shale and claystone; generally susceptible to
landsliding.
Tmu
Tml
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.
Ts Sespe Formation (Oligocene) - composed of sandstone; locally pebbly siltstone and
claystone; rocks are generally reddish in color.
Tcw Coldwater Sandstone Formation (late Eocene) - Composed of hard arkosic sandstone
with siltstone and shale interbeds.
Tcd Cozy Dell Formation (late Eocene) - Consists of micaceous shale with arkosic sandstone
interbeds: generally susceptible to landsliding.
Tma
Tmash
Matilija Sandstone Formation (middle to late Eocene) - composed of hard arkosic
sandstone with micaceous shale interbeds. Tmash consists predominately of
micaceous shale with thin sandstone interbeds.
Tj Juncal Formation (early to middle Eocene) - consists of micaceous shale with arkosic
sandstone interbeds; generally susceptible to landsliding.
Qha
Qpf1
Qpf2
Unit Correlation
Holocene
QUATERNARY
CENOZOIC
QhaQw
Tp
Qsb
Qlp
Qs
Qpf
Tsq
TmuTml
Ts
Tcw
Tcd
Tma
Tj
Qhf
Pleistocene
Pliocene
Miocene
Eocene
OligoceneTERTIARY
Qpa
Qpf1
Qpf2
Qls
Tmash
George J Saucedo
Preliminary Geologic Map available from: http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm
