Qhc
Qha Qoa
Qha
Qa
Qha
Qoa
Qhbm
QfQhbm
Qhbm
Qoa
Qhbm
af
QhfQhbm Qhf
Qhbm
Qhbm
Qhbm
Qpf
Qpf
Qoa
Qhbm
Qhbm
Qhbm
Qhbm
Qf
Qhbm
Qhbm
Qhbm
Qhbm
afbm
Qhbm
Qhf
Qhbm
Qhbm
Qpf
QhbmQhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qa
Qf
Qhbm
af
Qf
QhaQha
Qf
afbmQhbm
afbm
Qhbm
Qhbm
Qhbm
alf
alf
Qhc
af
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
QhbmQhbm
Qhbm
alf
Qhbm
Qhbm
Qhbm
Qhbm
alf
afbm
alf
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
Qhbm
alf
Qhbm
Qhbm
Qhbm
Qf
afQhbmQhbm
Qhbm
Qhbm
alf
Qhbm
Qhbm
alf
Qhbm
Qhbm
Qhbm
Qhbm
Qoa
Qhbmaf
afbmaf
Qoa
Qhbm
Qhbm
Qhbm
Qhbm
Qoa
Qa
Qa
Qa
Qa
Qhbm
Qhbm
alf
Qa
QoaQhbm
af
Qhbm
Qa
Qpfaf
Qf
Qhf
QhcQf
Qhf
Qhc
Qha
Qhf
Qha
afbm
QhfQhbm
afbm
Qpf
Qoa
af
af
alf
alf
afbm
Qhbm
Qhbm
Qhbm
Qhbm
afbm
alf
Qoa
Qhbm
Qhbm
afbm
Qhbm
alfQhbm
Qhbm
Qha
afQhbm
Qhbm
afbmQhbm
Qhbm
Qhbm
Qhbm
Qhbm
afbm
afbm
afbm
Qhbm
afbm
Qhbm
alfafbm
Qfafbm
Qhbm
afbm
QhbmQhbm
Qhf
Qhf
afbm
Qhf
afbm
Qhf
Qhbm
Qhbm Qhbm
Qhbm
Qhc
af
Qhbm
alf
Qhbm
Qhbm
af
Td
Tsv
Tsv
Tsp
Tsp
Tsp
Kgv
Kgv
Qls
Qls
Tsv
Qls
Qls
Th
Th
Th
Th
Th
Th
Th
Th
Th
Th
Th
Qhbm
alf
alf
Qhbm
Qhbm
Qhbm
Qhbm
alf
Qoa
alf
Qhbm
Qhf
af
Qhf
Qha
Qhbm
Qhf
Qf
Qha
alf
Qhbm
Qls
Qls
Qls
Qls
Qls
Qls
Qls
Qls
QlsTc
Tc
20
30
35
5540
45
af Artificial fill
afbm Artificial fill on bay mud (Qhbm).
alf Artificial levee fill
Qhbm Holocene estuarine deposits (bay mud). Holocene sediments deposited in a tidal
marsh, estuary, delta, or lagoon. Sediments are silts, fine sands, peats, and clays.
Qhc Modern stream channel deposits. Channel bed and bank deposits of the major
present- day creeks and streams. Deposits are late Holocene to modern in age
and consist of loose fluvial sand, gravel, and silt.
Qhf Holocene fan deposits. Holocene alluvial fan sediments, deposited by streams
emanating from the mountains as debris flows, hyperconcentrated mudflows, or
braided stream flows. Sediments include sand, gravel, silt and clay, that are
moderately to poorly sorted, and moderately to poorly bedded
Qha Holocene alluvium, undifferentiated. Alluvium of Holocene age, deposited in fan,
terrace, or basin environments. The unit is mapped where separate types of
deposits could not be delineated either due to complex interfingering of
depositional environments or the limited size of the area.
Qf Late Pleistocene to Holocene fan deposits. Gently sloping, fan-shaped, relatively
undissected alluvial surfaces where late Pleistocene or Holocene age was
uncertain or where the deposits of different age interfinger such that they could not
be delineated at the map scale. Sediments include sand, gravel, silt, and clay, that
are moderately to poorly sorted, and moderately to poorly bedded.
Qa Late Pleistocene to Holocene alluvium, undifferentiated. Alluvium deposited in small
valleys where separate fan, basin, and terrace units could not be delineated at the
map scale, and where Holocene or Pleistocene age was uncertain. The unit
includes flat, relatively undissected fan, terrace, and basin deposits, and small
active stream channels.
Qpf Late Pleistocene fan deposits. Gently sloping, fan-shaped alluvial surfaces where late
Pleistocene age is indicated by slight dissection and/or the development of alfisols.
Qoa Early to middle Pleistocene fan or terrace deposits. Moderately to deeply dissected
alluvial deposits capped by alfisols, ultisols, or soils containing a silica or calcic
hardpan.
Qls Landslide deposits. Holocene and Pleistocene landslides.
Th Huichica Formation (Pliocene). Fluvial gravel, sand, silt, and clay. Sediments are
derived mostly from the Sonoma Volcanics. A tuff interbed yields a K/Ar date of 4.09
+ 0.19 [Andre Sarna, written communication, 1981, reported in Kelly (1982)].
Tsv Sonoma Volcanics, undivided (Pliocene). Basalt to rhyolite flows, agglomerates, and
tuffs.
Td Domingene Formation (Eocene). Light gray to light brown quartz sandstone,
commonly crossbedded with minor shale and conglomerate; locally contains
serpentinite sandstone and conglomerate with gabbro clasts.
Tc Capay Shale (Eocene). Grayish-brown sandy shale.
Kgv Great Valley Sequence (Cretaceous). Sandstone, siltstone, shale, and minor
conglomerate.
Unit Explanation
(See Knudsen and others, 2000, for more information on
Quaternary units).
1 0 10.5
Miles
1 0 10.5
Kilometers
0 1,500 3,000750
Feet
0 .5 1 2
0 .5 1 2
0 1 2Thousand Feet
MNGN
15o
267 MILS0o16'
5 MILS
UTM GRID AND 2002 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET
0 4mi4km Petaluma
Novato
American Canyon
29
37
12121
INTERSTATE
80
INTERSTATE
780
INTERSTATE
580
Petaluma
Petaluma River
Sears Point
Cuttings Warf
STATE OF CALIFORNIA- GRAY DAVIS, GOVERNORTHE RESOURCES AGENCY- MARY NICHOLS, SECRETARY FOR RESOURCES
DEPARTMENT OF CONSERVATION- DARRYL YOUNG, DIRECTORCALIFORNIA GEOLOGICAL SURVEYJAMES F. DAVIS, STATE GEOLOGIST
Copyright © 2002 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."
GEOLOGIC MAP OF THE
CUTTINGS WHARF 7.5' QUADRANGLE
NAPA AND SOLANO COUNTIES, CALIFORNIA: A DIGITAL DATABASEVERSION 1.0
By
Stephen Bezore1, Carolyn E. Randolph-Loar2, and Robert C. Witter2
Digital Database
by
Jason D. Little1 and Victoria D. Walker1
2002
1. California Geological Survey, 801 K st. MS 12-31, Sacramento, CA 958142. William Lettis & Associates, Inc., 1777 Botello Drive, Suite 262 Walnut Creek, CA 94596
This geologic map was funded in part by the
USGS National Cooperative Geologic Mapping
Program, Statemap Award no. 01HQAG0092
Topographic base from
the U.S. Geological Survey
Polyconic Projection
Contour Interval: 40 feet
Dotted Contours: 10 feet
Contact between map units - solid where accurately located, dashed whereapproximately located; short dash where inferred; dotted where concealed.
Fault - solid where accurately located, dashed where approximately located;short dash where inferred; dotted where concealed. U = upthrown block,D = downthrown block. Arrow and number indicate direction and angleof dip of fault plane.
Landslide - arrows indicate principal direction of movement. Queriedwhere questionable.
Strike and dip of sedimentary beds:
Inclined
Horizontal
25
27
Symbol Explanation
References
Bryant, W.A., 1982, West Napa and SodaCreek Faults: California Department of
Conservation Division of Mines and Geology Fault Evaluation Report
FER-129, 8 p, scale 1:24,000.
Manson, M. W., 1988, Landslide hazards in the Cordelia-Vallejo area, Solano
and Napa counties, California: California Department of Conservation,
Division of Mines and Geology Open-File Report 88-22, scale 1:24,000.
Knudsen, K.L., Sowers, J.M., Witter, R.C., Wentworth, C.M., and Helley, E.J., 2000,
Preliminary geologic maps of the Quaternary deposits and liquefaction
susceptibity, nine-county San Francisco Bay Region, California : A digital
database: U.S. Geological Survey Open-File Report 00-44, ver. 1.0, scale
1:52,500.
Sims, J. D., Fox, K. F., Bartow, J. A., and Helley, E.A., 1973, Preliminary geologic
map of Solano County and parts of Napa, Contra Costa, Marin, and Yolo
counties, California: U.S. Geological Survey Miscellaneous Field Studies
MF-484, scale 1:62,500.
Weaver C. E., 1949, Geology and mineral deposits of an area north of San
Francisco Bay, California: California Division of Mines Bulletin 149, 135
p., scale 1:62,500.
Wills, C. J., and Majmundar, H. H., 2000, Lanslide hazard map of southwestern
Napa County, California: California Department of Conservation, Division
of Mines and Geology Open-File Report 99-06, scale 1:24,000.
}
}
Quaternary
Tertiary
Cretaceous
}}
Holocene
Pleistocene
}Miocene }}
}Eocene
QhbmQhc QhfQha
Qf QaQlsQpf
Qoa
Th
PlioceneTsv
Tsp
Td
Tc
Kgv
Unit Correlation
af afbm alf