GEOLOGIC MAP OF THE RUTHERFORD 7.5' QUADRANGLE … · sp af River t v f af mapped on gently...
Transcript of GEOLOGIC MAP OF THE RUTHERFORD 7.5' QUADRANGLE … · sp af River t v f af mapped on gently...
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St Johns Mtn Thrust
UTM GRID AND 1968 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET
0°21'6 MILS
18°320 MILS
GNMN
0
0
0
1
1
1.5
.5 2
2
2Thousand Feet
Kilometers
Miles
Contour Interval 20 Feet
Dotted Lines Represent 10 Foot Contours
Scale 1:24,000
Huffman, M.E., and Armstrong, C.F., 1980, Geology for planning in Sonoma County, California: California Division of MInes
and Geology Special Report 120, 31 p., plate 3A, scale 1:62,500.
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.
Fox, K.F. Jr., Fleck, R.J., Curtis, G.H., and Meyer, C.M., 1985, Potassium-Argon and fission track ages of the Sonoma Volcanics
in an area north of San Pablo Bay, California: U.S. Geological Survey MIscellaneous Field Studies Map MF-1753,
scale 1:250,000.
Knudsen, K.L., Sowers, J.M., Witter, R.C., Wentworth, C.M., Helley, E.J., 2000, Preliminary geologic maps of the Quaternary
deposits and liquefaction susceptibility, nine-county San Francisco Bay Region, California: A digital database: U.S.
Geological Survey Open-File Report 00-44, version 1.0, scale 1:52,500.
Mankinen, E.A., 1972, Paleomagnetism and Potassium-Argon Ages of the Sonoma Volcanics, California: Geological Society of
America Bulletin, v. 83, p. 2063-2072.
McLaughlin, R.J., Sarna-Wojcicki, A.M., Fleck, R.J., Langenheim, V., Jachens, R.C., and Deino, A., 2005, Framework Geology
and Structure of the Sonoma Volcanics and Associated Sedimentary Deposits of the Right-Stepped Rodgers Creek-
Maacama Fault System and Concealed Basins Beneath Santa Rosa Plain, in Late Neogene Transition from Transform to
Subduction Margin East of the San Andreas Fault in the Wine Country of the Northern San Francisco Bay Area, California:
Field Trip Guidebook to accompany the 2005 Geological Society of America Cordilleran Section Meeting, San Jose,
California, April 29 - May 1, 52 p.
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.
References
12121
37
780
128
12116
5Kilometers
5Miles
Mapping completed under
STATEMAP
FY 2001- 02
FY 2002- 03
FY 2003- 04
FY 2004- 05
Napa
Sonom
a
Novato
Mt. G
eorge
Napa
Petalum
a
Petalum
aRiver
Cuttings
Wharf
Glen E
llen
Cotati
Two R
ock
Sears P
oint
Yountville
Rutherford
GEOLOGIC MAP OF THE
RUTHERFORD 7.5' QUADRANGLE
SONOMA AND NAPA COUNTIES, CALIFORNIA: A DIGITAL DATABASE
VERSION 1.0
By
Kevin B. Clahan1, David L. Wagner2, Stephen P. Bezore2, Janet M.Sowers3, and Robert C. Witter3
Digital Database
By:
Carlos I. Gutierrez2
2005
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
Topographic base from
the U.S. Geological Survey
UTM Projection, zone 10,
North American Datum 1927
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
38°22'30"
122°30'00" 122°22'30"
38°22'30"
122°22'30"
38°30'00"
122°30'00"
38°30'00"
1. California Geological Survey, 185 Berry St., Suite 210, San Francisco, CA 94107
2. California Geological Survey, 801 K St. MS 12-31, Sacramento, CA 95814
3. William Lettis & Associates, Inc., 1777 Botello Drive, Suite 262 Walnut Creek, CA 94596
Symbol Explanation
Strike and dip of inclined bedding.25
Landslide - Arrows indicate principal direction of movement, queried where
existence is questionable; hachures indicate headscarp (source area).
Contact between map units - Solid where accurately located, dashed where
approximately located, queried where uncertain, dotted where concealed.
Fault - Solid where accurately located, dashed where approximately located,
dotted where concealed, queried where uncertain.
25 Strike and dip of inclined foliation.
?
Syncline - Dashed where approximately located.
Dike - Dashed where approximately located.
Thrust fault - barbs on upper plate; dashed where approximately located.
Unit Correlation
af alf Qhc
Qhl
Qpf
Qhty Qhay
Qht QhaQhfQf
Qls
sp
KJfsKJfmKJgv
Th
Tsp
unconformity
unconformityTsv
TsvaslTsvabsl
Tsvatsl
Tsvrb
Tsvb
Tsvbb
TsvtyTsvamTsvt
Tsvib
TsvaTsvpf
Tsvdg
Tsvr
QUATERNARY
Pliocene
Holocene
Pleistocene
Miocene
TERTIARY
CENOZOIC
MESOZOICCRETACEOUS
JURASSIC
Landslide deposits (Holocene and Pleistocene) - Includes debris flows and block slides.
Fan deposits (Pleistocene) - Sand, gravel, silt, and clay that is moderately to poorly sorted and bedded.
Mapped on alluvial fans where greater dissection indicates latest Pleistocene age.
San Pablo (Miocene) - Marine sedimentary mudstone and sandstone. Locally contains Neroly
Formation sandstone, light-colored to bluish-gray.
Serpentinite.
Alluvium, undivided (Holocene) - Alluvium deposited on fans, terraces, or in basins; composed of sand,
gravel, silt, and clay that are poorly sorted.
Stream terrace deposits (latest Holocene <1,000 years) - Stream terraces deposited as point bar and
overbank deposits along the Napa River and Conn Creek; composed of moderately sorted clayey
sand and sandy clay with gravel.
Alluvial deposits (latest Holocene <1,000 years) - Fluvial sediment deposited on the modern flood plains.
Modern stream channel deposits (Holocene <150 years) - Deposits in active, natural stream channels;
consists of loose alluvial sand, gravel, and silt.
Artificial fill (Holocene, historic) - May be engineered and/or non-engineered.
Artificial levee fill (Holocene, historic) - May be engineered and/or non-engineered.
Alluvial fan deposits (Holocene <10,000 years) - Alluvial fan sediment deposited by streams emanating
from mountain drainages onto alluvial valleys; composed of moderately to poorly sorted sand,
gravel, silt and clay.
Fan levee deposits (Holocene) - Fan sediments deposited as long, low ridges oriented down fan.
Unit Explanation
(See Knudsen and others (2000), for more information on Quaternary units).
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.
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.
Franciscan Complex melange (Early Cretaceous and Late Jurassic) - Tectonic mixture of masses of
resistant rock including sandstone, altered mafic volcanics (greenstone), chert, gabbro, and exotic
metamorphic rocks imbedded in a sheared shaley matrix.
Great Valley Sequence (Early Cretaceous and Late Jurassic) - Sandstone, pebble conglomerate,
siltstone, and shale.
Sonoma Volcanics (Pliocene to Miocene)
Tsv - Undifferentiated Sonoma volcanics consisting of mafic lava flows and tuffs, rhyolite to dacite
ash flow tuff, lava flows, intrusions, breccia; also includes tuffaceous sediment.
Tsvpf - Ash flow tuff and welded ash flow tuff, locally perlitic. Includes the 3.34-3.19 tuff of Petrified
Forest (Fox and others, 1985, McLaughlin and others, 2005).
Tsvb - Olivine basalt lava flows.
Tsva - Andesite lava flows of Mt. Veeder.
Tsvib - Basalt plugs and dikes.
Tsvdg - Dacite of Mt. George - Flows, domes and shallow intrusions of gray to tan porphyritic
dacite. The dacite is typically strongly flow banded. The upper surfaces of flows and
the margins of domes and intrusions are commonly perlitic. The base of the flows is a
black porphyritic pitchstone and pitchstone breccia. K-Ar ages for the dacite are
4.3±0.2 and 3.73±1.23 Ma (Mankinen, 1972; Fox and others, 1985).
Tsvrb - Rhyolite of Bismark Knob - Plagioclase phyric, bluish-gray rhyolite and/or dacite tuff. Often
has near-source breccia; some water-laid deposits.
Tsvbb - Basalt of Bismark Knob - Plagioclase, pyroxene, olivine phyric, flow basalt. Pyroxene
phenocrysts have distinctive yellow alteration.
Tsvam - Andesite of Mission Highlands - Gray, plagioclase phyric, andesite interbedded with tuff.
Locally has a platy foliation.
Tsvty - White pumiceous tuff; locally contains mudstone clasts from underlying Great Valley
Sequence. Contains an ashflow tuff similar to or equivalent to 4.83 Ma Lawlor tuff
(Andrei Sarna-Wojcicki and Elmira Wan, personal communication, 2005).
Tsvt - Light colored tuff, lithic rich in places. Locally includes tuffaceous, diatomaceous lacustrine
sediments.
Tsvr - Rhyolite lava flows and flow breccias, undifferentiated, light colored.
Tsvasl - Andesite flows of Stags Leap.
Tsvabsl - Andesite flow breccia of Stags Leap.
Tsvatsl - Andesite ash flow tuff and tuff breccia of Stags Leap.
KJfm
KJfs
sp
KJgv
Tsp
Qls
Th
Qha
Qhty
Qhc
af
alf
Qhf
Qhl
Qhay
Qpf
Qf
Qht
Tsvpf
Tsvdg
Tsvb
Tsvrb
Tsvbb
Tsvam
Tsvty
Tsvt
Tsvib
Tsvr
TsvaslTsvabsl
Tsvatsl
Franciscan graywacke (Jurassic-Cretaceous). Thick-bedded graywacke with minor interbedded
shale. The graywacke is moderately to intensely sheared but lacks tectonic blocks characteristic
of Franciscan melange.
Tsv
Tsva
Huichica Formation (Pliocene) - Gravel, sand, reworked tuff, and clay. A tuff interbed yields a K-Ar
date of 4.09±0.19 Ma (Fox and others, 1985).
Preliminary Geologic Map available from:
http://www.conservation.ca.gov/cgs/rghm/rgm/preliminary_geologic_maps.htm
Revised: 03/01/2006