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Kg Ks Kf Kv Tmk Tpth Ky KJgv Qhf Kfo KJgv Tmk Qls Tmk Qls Tpth Qa Qhf Qls Kfo Qls Qls Tmk Qls Tnv Qpf Qls Tpu Kuss Tpb Qha Tpth Tsh Tn Qls Tpth Qls Qt Tnvu Kfo Qhf Qa Tnvm Kuss Tsh Qls Qls Qls Kfo Qhly Qht Tsh Qls Tn Qls Qls KJss Qha Qls Qht Qhf Tsh Qls Qa Tsh Qha Tpth Qls Qhf Tnvu Kuss Qhf Tnvu Kuss Qls Qls Qls Qha Tnvu Tnvl Tmk Tpb Qls Qa Qhc Qls Qha Tsh Qls Qls Qls Qls Tpus KJgv Qt Qls Qls Qls Qls Qha Qht Qls Qls Qls Qhf Qhf Qha Kfo Qt Qls Qls Qls Qls Qls Qls Qls Kuss Kv Qls Tpus Tsh Qf Qls Qt Qha Qls Qhf Tnvl Qls Qls Qls Qls Qls Qht Qt Qls Qls Qls Qls Tpth Tnvu Qls Qls Kv Qls Qt Qls Tpb Qls KJgv Qls Tsh Qls Qls Qls Qls Qha Qha Tpb Qls Qt Qls Qls Qls Qls Qhc Qhc Ksh Qhc Ksh Tnvm Tnvl Ksh Kuss Tsh Tnvm Qpf Ksh Tnvl Tnvu Tnvm Tnvl Qls Tsh Qhc Qhf Qha Qhc Tnvm Tpu Qhc Qha Tpu Qls Qha Tpu Qls Qha Qls Qhc Qls Qhc Qt Qls Kuss Tnvl Qls Tptt Qhc Tnv Qls Qls Qls Tnvu Tnvl Qhf Tpb Qls Qhc Qha Qls Qls Tnvm Tpus Tnvl Qls Qls Tnvl Ksh Ksh Tnvl Ksh Qls Qls Qls Tnvl Qls Qls Qls Tmk Tnvm Qls Kv Qls Qls Qha Qls Ksh Qls Qls Qtv Tmk Qhc Qls Qls Tpu Qls Qls Qls Qls Qls Qls Tpu Qha Ksh Qhf Qhf Tsh Tpu Qhc Kuss Tsh Kv Kv Ky Ky Ky Ky Ks Ks Ks Kf Kf Kg Kg Kuss Kfo 4 8 9 6 5 6 8 9 8 4 4 8 5 6 6 21 37 26 10 46 34 12 56 64 24 23 48 56 49 41 38 42 12 24 10 30 11 47 32 44 44 25 44 60 27 22 30 43 44 21 27 18 46 46 60 46 30 36 32 16 36 35 32 17 28 23 17 43 28 23 49 46 40 58 50 46 32 15 48 53 35 10 50 44 46 12 24 37 55 14 30 45 40 35 47 21 15 30 30 20 43 15 52 10 40 55 15 48 55 66 50 48 28 35 53 25 12 40 25 45 55 30 19 25 23 65 10 67 40 45 38 30 34 59 52 68 42 22 43 26 26 37 36 40 Tpu Tpu Qa 5 Kilometers 5 Miles 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 12 116 80 80 680 San Pablo Bay 780 37 128 Sonoma Novato Mt. George Napa Petaluma Petaluma River Cuttings Wharf Glen Ellen Cotati Two Rock Sears Point Yountville Rutherford Fairfield South Cordelia Capell Valley Fairfield North 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 Geology Bulletin 181, p. 53-86. Merriam, C.W., and Turner, F.E., 1937, The Capay middle Eocene of northern California: University of California Publications in Geological 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: University of 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 across the northern Sierra Nevada and Diamond Mountains, California, in Page, W.D., leader, Quaternary geology along the boundary between 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, Solano County, 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: California State 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: California Division 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: Geological Society 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 Quaternary deposits and liquefaction susceptibility in the central San Francisco Bay Region, California: U.S. Geological Survey Open-File Report 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 where approximately located. MAP SYMBOLS QUATERNARY Pliocene Holocene Pleistocene Miocene TERTIARY CENOZOIC Qhly Qls Qht Qha Qf Qa MESOZOIC CRETACEOUS JURASSIC Qhf Tn Qhc Qtv Qt Paleocene Tmk Tsh Eocene Tpu Tpus KJgv KJss Tpb Ksh Kfo Kg Kf Ks Ky Kv Kuss Tnvm Tnv 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 surfaces that 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; consists of 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 where deposits might be of late Pleistocene or Holocene age; composed of unconsolidated, poorly sorted, clayey sand 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 Cement Hill 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 geochemical similarities, indicating that it is the distal remnant of extensive flood basalts that extended from the Sierra Nevada 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 nannofossils of 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 contains white ash tuff and tuff-breccia. Putah Tuff member (Pliocene) - Water-laid tuff and tuffaceous sandstone near the base of the Tehama Formation. 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 foraminifera of Paleocene age (Graymer r , 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 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." 122°00' 38°22'30" 38°22'30" 122°07'30" 122°07'30" 38°30' 122°00' 38°30' GEOLOGIC MAP OF THE MT. VACA 7.5' QUADRANGLE SOLANO, NAPA, AND YOLO COUNTIES, CALIFORNIA: A DIGITAL DATABASE VERSION 1.0 By Mark O. Wiegers 1 , Janet M. Sowers 2 , and Robert C. Witter 2 Digital Database by: Carlos I. Gutierrez 1 2007 CALIFORNIA GEOLOGICAL SURVEY JOHN G. PARRISH, Ph.D., STATE GEOLOGIST STATE OF CALIFORNIA -ARNOLD SCHWARZENEGGER, GOVERNOR THE 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 Cooperative Geologic Mapping Program, STATEMAP Award no. 06HQAG0036 Topographic base from U.S. Geological Survey Mt. Vaca 7.5-minute Quadrangle, 1968 UTM projection, Zone 10, North American Datum 1927 1. California Geological Survey 2. William Lettis & Associates, Inc., Walnut Creek, CA UTM GRID AND 1968 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET 0°35' 10 MILS GN MN 17 1 /2° 311 MILS 0 1 1 .5 .5 2 2 2 Thousand Feet Kilometers Miles Contour Interval 20 Feet Dotted 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
