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