geologic map of the mt. vaca 7.5' quadrangle … · qt tnv u o qhf qa t m kuss tsh s ql s qls...
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Kg
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6650 48 28
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34 59
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2243
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3640
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5Kilometers
5Miles
Napa
Mapping completed under STATEMAP
FY 2001-02
FY 2002-03
FY 2003-04
FY 2004-05
FY 2005-06
CGS CD 2002-07*
FY 1997-98
12 121
12116
80
80680
San PabloBay
780
37
128
Sonoma
Novato
Mt. George
Napa
Petaluma
PetalumaRiver
CuttingsW
harf
Glen Ellen
Cotati
Two Rock
Sears Point
Yountville
Rutherford
FairfieldSouth
Cordelia
Capell Valley
FairfieldNorth
Kenwood
FY 2006-07
Mt. Vaca
*GIS data for the Cordelia and Fairfield South 7.5’ quadrangles available on CD - CGS CD 2002-07.
Almgren, A.A., Filewicz, M.V. and Heitman, H.L., 1988, Lower Tertiary foraminiferal and calcareous nannofossil zonation of California: an overview: Pacific Section, Society of Economic Paleontologists and Mineralogists, v. 58, p.83-105.
Durrell, Cordell, 1959, The Lovejoy Formation of northern California: University of California Publications in Geological Sciences,v. 34, no. 4, p. 193-219.
Graymer, R.W., Jones, D.L., and Brabb, E.E., 2002, Geologic map and map database of northeastern San Francisco Bay Region, Most of Solano County and parts of Napa, Marin, Contra Costa, San Joaquin, Sacramento, Yolo, and Sonoma counties: U.S. Geological Survey Miscellaneous Field Studies Map MF-2403, scale 1:62,500.
Lachenbruch, M.C., 1962, Geology of the west side of the Sacramento Valley: California Division of Mines and GeologyBulletin 181, p. 53-86.
Merriam, C.W., and Turner, F.E., 1937, The Capay middle Eocene of northern California: University of California Publications inGeological Sciences, vol. 24, no. 6, p. 91-113.
Miller, W.L., 1966, Petrology of the Putah Tuff Member of the Tehama Formation, Yolo and Solano counties, California: Universityof California, Davis, M.S. thesis, 85 p.
Page, W.D., Sawyer, T.L., and Renne, P.R., 1995, Tectonic deformation of the Lovejoy Basalt, a late Cenozoic strain gage acrossthe northern Sierra Nevada and Diamond Mountains, California, in Page, W.D., leader, Quaternary geology along the boundarybetween the Modoc Plateau, southern Cascades and northern Sierra Nevada: Friends of the Pleistocene Pacific Cell Field Trip.
Prothero, D.R., and Brabb, E.E., 2001, Magnetic stratigraphy of the lower middle Eocene (type Ulatisian) Vacaville Shale, SolanoCounty, California: Pacific Section, Society of Economic Paleontologists and Mineralogists, v. 91, p. 56-64.
Siegel, David, 1988, Stratigraphy of the Putnam Peak Basalt and correlation to the Lovejoy Formation, California: CaliforniaState University, Hayward, M.S. thesis, 119 p.
Sims, J.D., Fox, K.F., Bartow, J.A., and Helley, E.J., 1973, Preliminary geologic map of Solano and parts of Napa, Contra Costa, Marin, and Yolo counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-484, scale 1:62,500.
Wagner, D.L., Saucedo, G.J., and Grose, T.L.T., 2000, Tertiary volcanic rocks of the Blairsden area, northern Sierra Nevada,California, in Brooks, E.R., and Dida, L.T., Field guide to the geology and tectonics of the northern Sierra Nevada: CaliforniaDivision of Mines and Geology Special Publication 122, p. 155-172.
Weaver, C.E., 1949, Geology of the Coast Range immediately north of the San Francisco Bay Region, California: GeologicalSociety of America Memoir 35, 242 p., plates 6, 10, scale 1:62,500.
Witter, R.C., Knudsen, K.L., Sowers, J.M., Wentworth, C.M., Koehler, R.D., and Randolph, C.E., 2006, Maps of Quaternarydeposits and liquefaction susceptibility in the central San Francisco Bay Region, California: U.S. Geological Survey Open-FileReport 2006-1037.
References:
Strike and dip of bedding.25
Landslide - Arrows indicate principal direction of movement.
Fault - Solid where accurately located, dashed where approximately located,dotted where concealed.
Contact between map units - Solid where accurately located, dashed whereapproximately located.
MAP SYMBOLS
QUATERNARY
Pliocene
Holocene
Pleistocene
Miocene
TERTIARY
CENOZOIC
Qhly
Qls
Qht QhaQf Qa
MESOZOIC
CRETACEOUS
JURASSIC
Qhf
Tn
QhcQtv
Qt
Paleocene
Tmk
Tsh
Eocene
Tpu
Tpus
KJgv
KJss
Tpb
Ksh
Kfo
Kg
Kf
Ks
Ky
Kv
Kuss
TnvmTnv
Tnvu
Tnvl
Tpth Tptt
CORRELATION OF MAP UNITS
Landslide deposits (Holocene and Pleistocene) - Includes debris flows and block slides.Qls
Alluvium, undivided (latest Pleistocene to Holocene) - Alluvial deposits on flat, relatively undissected surfacesthat cannot be delineated as individual fans, terraces or basins.
Qa
Qha Alluvium, undivided (Holocene) - Alluvium deposited on fans, terraces, or in basins; composed of sand, gravel, silt, and clay that are poorly sorted.
Qhc Modern stream channel deposits (Holocene <150 years) - Deposits in active, natural stream channels; consistsof loose alluvial sand, gravel, and silt.
Qhf Alluvial fan deposits (Holocene) - Alluvial fan sediment deposited by streams emanating from mountain drainages onto alluvial valleys; composed of moderately to poorly sorted sand, gravel, silt and clay.
(See Witter and others (2006), for more information on Quaternary units).
Qf Alluvial fan deposits (latest Pleistocene to Holocene) - Alluvial fan sediment on gently-sloping, fan-shaped,relatively undissected alluvial surfaces; composed of moderately to poorly sorted sand, gravel, silt, and clay.
Qht Stream terrace deposits (Holocene) - Stream terraces deposited as point bar and overbank deposits; composed of moderately to well-sorted and bedded sand, gravel, silt, and minor clay.
Qt Stream terrace deposits (latest Pleistocene to Holocene) - Deposited in point bar and overbank settings wheredeposits might be of late Pleistocene or Holocene age; composed of unconsolidated, poorly sorted, clayeysand and sandy clay with gravel.
Qhly Alluvial fan levee deposits (Holocene < 1,000 years) - Sand and silt overbank deposits along channel margins of young alluvial fans.
Qtv Travertine (Holocene) - Youthful, vuggy travertine deposits and related calcareous material forming coatings and crusts in two small stream channels at the top of Gates Canyon. These deposits are similar to larger travertine deposits associated with cold saline springs emanating from Upper Cretaceous rocks at CementHill and Tolenas Springs in the Fairfield North quadrangle.
Tn Neroly sandstone (late Miocene) - Bluish-gray, fine- to medium-grained lithic sandstone, tuffaceous sandstone, and light-gray, white-weathering tuffaceous shale.
Tpb Putnam Peak Basalt (Miocene) - Olivine-bearing basalt flow. Columnar jointing weakly developed locally.Correlated with the Lovejoy Basalt of the Sierra Nevada (Durrell, 1959; Siegel, 1988) based on geochemicalsimilarities, indicating that it is the distal remnant of extensive flood basalts that extended from the SierraNevada to the Coast Ranges. Recent Ar/Ar analysis has yielded an age of about 16 Ma (Page and others,1995; Wagner and others, 2000).
Tsh
Tmk Markley Sandstone (Eocene) - Brown, micaceous arkosic sandstone. Also contains sandy shale, carbonaceous shales and lenses of conglomerate. Locally exhibits cross bedding, soft-sediment deformation and subaqueous debris flow deposits containing mudstone boulders up to 3 feet in diameter. Quartz grains commonly coated with iron oxide.
Shale (Eocene) - Brown to dark-gray mudstone containing fossil foraminifera, micaceous shale, and sandy shale.Unit contains glauconitic horizons. Previously mapped as the Capay Formation (Weaver, 1949) and the Vacaville Shale (Merriam and Turner, 1937). This unit contains foraminifera and calcareous nannofossilsof middle and early Eocene age (Almgren and others, 1988; Prothero and Brabb, 2001; Ristau, unpublished data, 2007).
Tpth
Tptt
Tehama Formation (Pliocene) - Volcaniclastic pebble- to cobble-conglomerate, tuffaceous sandstone, siltstone, and claystone of continental origin. Gravels dominated by well-rounded clasts of andesite. Unit containswhite ash tuff and tuff-breccia.
Putah Tuff member (Pliocene) - Water-laid tuff and tuffaceous sandstone near the base of the TehamaFormation. This unit has yielded a radiometric age of 3.3 ± 0.1 Ma (Miller, 1966)
Tnv
Tnvu
Nortonville Shale Member of the Kreyenhagen Formation (Eocene) - Light-gray to brownish-gray, thinly- laminated shaly siltstone and concretionary shale, brown mudstone, micaceous lithic sandstone and arkose commonly containing fossil foraminifera. Shales and mudstones are locally glauconitic. In the Vacaville area, a persistant sandstone lens separates the unit into three mappable members.
Upper member - Brown mudstone and clay shale, locally carbonaceous.
Tnvm Middle member - Argillaceous feldspathic arkose.
Tnvl Lower member - Mudstone and silty shale containing fossil foraminifera, locally rich in glauconite.
Tpu
Tpus
Kuss
Shale and sandstone (Paleocene) - Brown to brownish-gray shale and sandy mudstone with brown friable thin beds of glauconite-bearing biotite wacke and quartz muscovite sandstone. This unit contains foraminiferaof Paleocene age (Graymerr , and others, 2002).
Basal sandstone member - White, clean mica- and quartz-rich sandstone, cross-bedded in places.
Sandstone (Late Cretaceous) - Brown to brownish-gray, fine- to medium-grained sandstone.
Ksh Shale (Late Cretaceous) - Brown to gray siliceous shale, contains radiolarians and foraminifera of Late Cretaceous age (Ristau, unpublished data, 2007).
Kfo
Kg
Kf
Ks
Ky
Kv
Forbes Formation (Late Cretaceous) - Thick beds of fine- to coarse-grained sandstone with shell fragments grading upward into interbedded siltstone and shale.
Guinda Formation (Late Cretaceous) - Thick-bedded to massive sandstone grading upward into siltstone and shale.
Funks Formation (Late Cretaceous) - Siltstone and mudstone with thin beds of sandstone.
Sites Formation (Late Cretaceous) - Thick-bedded, laminated fine- to medium-grained sandstone with moderately thick beds of siltstone.
Yolo Formation (Late Cretaceous) - Moderately thick-bedded, fine- to coarse-grained sandstone, mudstone and micaceous siltstone.
Venado Formation ( Late Cretaceous) - Massive to thick-bedded, shale-chip bearing sandstone with minor siltstone. North of the Mount Vaca quadrangle at Monticello Dam, this unit includes a basal submarine slump deposit consisting of megabreccia with angular blocks of sandstone and siltstone in a conglomeratic mudstone matrix.
KJgv Sandstone and shale (Early Cretaceous and Late Jurassic) - Mostly thin-bedded sandstone with interbedded siltstone, shale, and mudstone. Contains discontinuous beds of conglomerate.
KJss Ridge-forming sandstone beds.
Great Valley Sequence
DESCRIPTION OF MAP UNITS
Copyright © 2007 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."
122°00'38°22'30" 38°22'30"
122°07'30"
122°07'30"38°30'
122°00'38°30'
GEOLOGIC MAP OF THEMT. VACA 7.5' QUADRANGLE
SOLANO, NAPA, AND YOLO COUNTIES, CALIFORNIA:A DIGITAL DATABASE
VERSION 1.0By
Mark O. Wiegers1, Janet M. Sowers2, and Robert C. Witter2
Digital Databaseby:
Carlos I. Gutierrez1
2007
CALIFORNIA GEOLOGICAL SURVEYJOHN G. PARRISH, Ph.D., STATE GEOLOGIST
STATE OF CALIFORNIA - ARNOLD SCHWARZENEGGER, GOVERNORTHE RESOURCES AGENCY - MIKE CHRISMAN, SECRETARY FOR RESOURCES
DEPARTMENT OF CONSERVATION - BRIDGETT LUTHER, DIRECTOR
This geologic map was funded in part by the U.S. Geological Survey National CooperativeGeologic Mapping Program, STATEMAPAward no. 06HQAG0036
Topographic base from U.S. Geological SurveyMt. Vaca 7.5-minute Quadrangle, 1968UTM projection, Zone 10, North American Datum 1927
1. California Geological Survey2. William Lettis & Associates, Inc., Walnut Creek, CA
UTM GRID AND 1968 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET
0°35'10 MILS
GNMN
171/2°311 MILS
0 1
1.5
.5 2
2
2Thousand Feet
Kilometers
Miles
Contour Interval 20 FeetDotted Lines Represent 10 Foot Contours
Datum is mean sea level
Scale 1:24,000
0
0
1
Preliminary Geologic Map available from:http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm
Revised: 09/28/2007
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