7 3 4 67 83 74 60 54 58 35 30 68 35 44 53 35 59 34 46 29 28 62 57 54 64 34 34 48 29 29 48 27 32 49 22 77 55 40 34 40 45 60 68 58 40 62 40 43 45 60 40 37 40 70 70 45 25 40 75 60 31 60 55 65 44 63 87 20 66 36 56 42 43 35 57 50 56 50 36 37 40 45 42 35 41 38 44 57 50 47 55 36 23 20 17 21 57 50 25 20 36 28 28 24 47 70 24 39 22 31 19 18 40 26 82 30 32 48 40 26 25 37 35 58 60 32 35 55 27 25 35 32 45 40 40 30 75 35 37 35 40 30 30 38 50 40 25 25 51 38 32 27 10 26 41 31 30 25 70 60 40 40 44 71 60 84 40 36 44 30 40 48 44 43 55 37 30 35 30 23 27 20 27 45 35 55 46 60 23 45 47 47 40 40 45 50 51 50 61 30 36 40 47 46 59 65 55 35 60 30 36 37 65 55 43 35 43 55 48 51 28 38 36 54 70 30 41 30 63 55 28 25 38 43 35 45 37 30 59 27 KJgv Qf Kv Kg Ks Ks KJgv Qhl Qhf Kf Qhf Qpf Kg Ky Kg Qhf Ks Kg Qhf Qpf Qhf KJgv Kg Qpf Qha Kg Qhff Qhf Kf Qpf KJgv Qa KJgv Qa Qhf Ks Qhf Qa Qpf KJgv Qhf Qhff Ks Qhf Qhf Qa Qa KJss Qhf Qls Td Qhf Qa Qha KJgv KJgv KJgv Qhff Tpth Qhl Qa Qhc Qpf Qa KJss Qa KJss KJgv KJss Teu KJgv Qhl Kfo Qha Kfo Kf KJss Qhff Kg Qhf KJss Kg Qpf Kush Kf Qhl Qhl Kf af Qpf Tmz Qhf Qhl Qhc KJss Tsvm Qls Qa Qhb Qhc af Qls Qls Qtv Qha Qhc Qls Ky Qhl Qha Qhc af af Qls Qtv Qls Qls Qls Kv Kush Qha Qoa Qpf Qls Qhff Qls Qls Qha Kg Qls KJgv af Qhb KJgv Qls Qa Tpus Qhc Td Qls af Kf Kush Qls Qhl Qha Qls Qoa af Qls Qls Ks af Qhf af Qls Qha Qhb Kfo Qa Qls Qt Qhc Qls Kfo Qhf Qls Qpf Ks Qhf Qpf Qa af Qtv Qtv Qtv Qhf Qhf Tpth Qha Qha Qhf KJgv Qa Qa Qhf af Tpu KJgv Tsvm Kg Qhl Qha af Kg Ks Qa Qhl Kush KJgv af Qhc Qhc Qhc Kush KJss Qhf Qhc Kg Qhc Qhf Qtv Qha Qhf Qhf Qha KJgv Qhf Qhl Qhl Qpf af Kg Ks Ks Ky Kv Kv Ky Kg KJgv KJgv KJgv KJgv Qhc Tpu Tpus Qhly 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." 122°00'00" 38°15'00" 38°15'00" 122°07'30" 122°07'30" 38°22'30" 122°00'00" 38°22'30" GEOLOGIC MAP OF THE FAIRFIELD NORTH 7.5' QUADRANGLE SOLANO AND NAPA 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 3 2006 CALIFORNIA GEOLOGICAL SURVEY JOHN G. PARRISH, PhD., STATE GEOLOGIST STATE OF CALIFORNIA - ARNOLD SCHWARZENEGGER, GOVERNOR THE RESOURCES AGENCY - MICHAEL CHRISMAN, SECRETARY FOR RESOURCES DEPARTMENT OF CONSERVATION - BRIDGETT LUTHER, DIRECTOR 1. California Geological Survey, 135 Ridgway Avenue, Santa Rosa, CA 95401 2. William Lettis & Associates, Inc., 1777 Botello Drive, Suite 262, Walnut Creek, CA 94596 3. California Geological Survey 801 K Street, MS 12-31, Sacramento, CA 95814 This geologic map was funded in part by the U.S. Geological Survey National Cooperative Geologic Mapping Program, STATEMAP Award no. 05HQAG0080 Topographic base from U.S. Geological Survey Fairfield North 7.5-minute Quadrangle, 1980 UTM projection, North American Datum 1927 Strike and dip of bedding. 25 Landslide - Arrows indicate principal direction of movement. Symbol Explanation Contact between map units - Solid where accurately located, dashed where approximately located, dotted where concealed. Fault - Solid where accurately located, dashed where approximately located, dotted where concealed. Axis of syncline - Solid where accurately located, dotted where concealed. Anticline - Solid where accurately located, dashed where approximately located; dotted where concealed. 25 Strike and dip of overturned bedding Strike and dip of vertical bedding Fox, K.F. Jr., 1983, Tectonic setting of late Miocene, Pliocene and Pleistocene rocks in part of the Coast Range North of San Francisco, California: U.S. Geological Survey Professional Paper 1239, 92 p. Hart, E.H., 1978, Limestone, dolomite, and shell resources of the Coast Ranges Province, California: California Division of Mines and Geology Bulletin 197, 103 p. 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. 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. 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 UTM GRID AND 1980 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET 0°35' 10 MILS GN MN 16 1 /2° 293 MILS 0 0 0 1 1 1 .5 .5 2 2 2 Thousand Feet Kilometers Miles Contour Interval 20 Feet Dotted Lines Represent 5 Foot Contours National Geodetic Vertical Datum of 1929 Scale 1:24,000 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 QUATERNARY Pliocene Holocene Pleistocene Miocene TERTIARY CENOZOIC Unit Correlation Qha Qhly Qoa Qls Qt Qht Qha Qf Qa Qof MESOZOIC CRETACEOUS JURASSIC Qpf Qhf Tsvm af Qhc Qhff Qhl Qtv Paleocene Td Teu Eocene Tpu Tmz Tpus KJgv KJss Kush Kfo Kg Kf Ks Ky Kv Landslide deposits (Holocene and Pleistocene) - Includes debris flows and block slides. Qls Alluvium, undivided (latest Pleistocene to Holocene) - Flat, relatively undissected fan, terrace, and basin deposits. Qa Qoa Alluvial deposits, undivided (early to late Pleistocene) - Alluvial fan, stream terrace, basin, and channel deposits. Topography is gently rolling with little or no original alluvial surfaces preserved; moderately to deeply dissected. 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. Unit Explanation (See Witter and others (2006), for more information on Quaternary units). Qf Alluvial fan deposits (latest Pleistocene <~30,000 years to Holocene) - Sand, gravel, silt and clay mapped on gently sloping, fan-shaped, relatively undissected alluvial surfaces. Qht Stream terrace deposits (Holocene <10,000 years) - Stream terraces deposited as point bar and overbank deposits along Lichau Creek; composed of moderately to well-sorted and bedded sand, gravel, silt, and minor clay. Qof Alluvial fan deposits (early to late Pleistocene) - Alluvial fan sediment composed of weakly cemented conglomerate and sandstone. Clasts are volcanic, subrounded, and range up to 8 inches in diameter. Topography is moderately rolling with little or no original alluvial surfaces preserved; deeply dissected. Tsvm Sonoma Volcanics, mafic flows and breccias (Miocene) - Basalt, basaltic andesite and andesite flows and breccias, interbedded with volcanic agglomerate and tuff. Qhl Fan levee deposits (Holocene) - Fan sediments deposited as long, low ridges oriented down fan. The deposits contain coarser material than the adjoining areas. af Artificial fill (Holocene, historic) - May be engineered and/or non-engineered. Qpf Alluvial fan deposits (late Pleistocene) - Late Pleistocene age is indicated by greater dissection than is present on Holocene fans; composed of moderately to poorly sorted and bedded gravel, sand, silt, and clay. Qt Stream terrace deposits (late 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 Qhff Qhb Alluvial fan levee deposits (Holocene < 1,000 years) - Sand and silt overbank deposits along channel margins of young alluvial fans. Alluvial fan deposits, fine facies (Holocene) - Predominantly clay and silt with interbedded coarser alluvium deposited on distal portions of alluvial fans and valley floors. Basin deposits (Holocene) - Fine-grained clay-rich alluvium with horizontal stratification. May contain peat and interbedded coarser alluvium. Qtv Travertine (Holocene and Pleistocene) - Surficial deposits of fine- to coarse-grained travertine, microcrystalline onyx and related calcareous materials deposited by saline springs associated with faults. Spring waters are rich in 18 O indicating a deep basinal rather than a meteoric source (Criss, written communication, 1998). Travertine deposits are underlain by brecciated sandstone and conglomerate cemented by travertine. Travertine in the Fairfield North quadrangle was mined for cement at Cement Hill and for decorative material at both Cement Hill and Tolenas Springs (Hart, 1978). Teu Tpu Tpus Tmz Kush Td Domengine Sandstone (Eocene) - White quartz-rich sandstone with interbedded sandstone and shale. Unnamed mudstone, sandstone, siltstone (Eocene) - Foram-bearing mudstone, sandstone and siltstone. Contains Early Eocene nannofossils (Ristau, unpublished data, 2006). Unnamed sandstone and shale (Paleocene) - Sandstone, siltstone and foram-bearing mudstone and shale. In the Cement Hill area, this unit contains Paleocene nannofossils and a glauconite-rich basal zone in contact with Upper Cretaceous rocks (Ristau, unpublished data, 2006). Basal sandstone member - Mica- and quartz-rich sandstone, cross-bedded in places. Present in the Vaca Valley area. Martinez Formation (Paleocene) - In the Cement Hill area, this unit contains a shell-rich sandstone bed with Paleocene Turritella fossils (Ristau, unpublished data, 2006)(Powell, written communication, 2002). Unnamed sandstone and shale (Late Cretaceous) - Sandstone, siliceous shale and mudstone. 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 Fairfield quadrangle at Monticello Dam, this unit includes a basal submarine slump deposit consisting of megabreccia with angular blocks of sandstone and siltstone in 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 Preliminary Geologic Map available from: http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm Revised: 09/27/2006