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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, queried where uncertain.

U = upthrown block, D = downthrown block. Arrow and number indicate

direction and angle of dip of fault plane.

Strike and dip of sedimentary beds:

Inclined

Horizontal

25

Symbol Explanation

Landslide - arrows indicate principal direction of movement. Queriedwhere questionable, (Not all landslides shown, for additional landslide

information see Rice, S.R., 1973).

27?

MNGN

15o

267 MILS0o16'

5 MILS

UTM GRID AND 2002 MAGNETIC NORTHDECLINATION AT CENTER OF SHEET

0

0

0

1

1

1.5

.5 2

2

2Thousand Feet

Kilometers

Miles

Contour Interval: 40 feet

0 4mi4km Petaluma

Novato

American Canyon

29

37

12121

INTERSTATE

80

INTERSTATE

780

INTERSTATE

101

Petaluma

Petaluma River

Sears Point

Cuttings Wharf

Kn

Qht

af Artificial fill

afbm Artificial fill placed over bay mud

alf Artificial levee fill

Qhc Modern (<150 years) stream channel deposits in active natural stream

channels. Deposits are late Holocene to modern in age

and consist of loose alluvial sand, gravel, and silt.

Qhbm

Qhf Holocene alluvial fan deposits- Gravel, sand, silt, or clay

deposited by streams emanating from canyons onto

alluvial valley floors as debris flows, hyperconcentrated

mud flows, or braided stream flows. Sediment is

moderately to poorly sorted and moderately to poorly

bedded.

Qha Holocene alluvium, undivided- Alluvium deposited on fans,

terraces, or in basins. Gravel, sand, and silt that are poorly

to moderately sorted.

Qpf Latest Pleistocene (<~30,000) alluvial fan deposits. Similar to Holocene

fans (Qhf), but they are more dissected.

Qoa Early to late Pleistocene deposits, undivided. Includes alluvial

fan, stream terrace, basin, and channel deposits.

Topography often consists of gently rolling hills with little or

none of the original planar surface preserved.

Qc Colluvium. Unconsolidated and unsorted soil and weathered

rock fragments accumulated on or at the base of slopes.

Qls Landslides. Includes debris flow and block slump landslides.

Arrows show the direction of movement.

Tv Tertiary volcanic rocks. Andesite, dacite, and rhyolite, mostly

dikes, but some are flow remnants. These rocks are similar

to and are likely related to the Burdell Mountain Volcanics.

KJfs Franciscan Complex sandstone and shale- Thick bedded, arkosic sandstone and

interbedded shale. Arkose is composed of coarse, fairly

well sorted quartz and feldspar grains with minor fine-grained

matrix.

KJfm Franciscan Complex melange- tectonic mixture of masses of resistant rock

types including sandstone, altered mafic volcanic rock (greenstone),

chert, serpentinite, and exotic metamorphic rocks embedded in a

sheared, shaley matrix. Blocks within the melange large enough to

be shown on the map are: ss, sandstone and shale; ch, chert;

mv, metamorphosed basaltic rocks; gs, greenstone.

KJfsch Franciscan Complex schist, phyllite, and semischist- slightly to well foliated metasedimentary

and metavolcanic rocks.

Novato Conglomerate - Massive, well cemented coarse conglomerate

in the northeast corner of the quadrangle, composed of well rounded pebbles,

and cobbles, of chert, rhyolite, granite, and qurtzite in a coarse, sandy matrix (Part

of the Great Valley Sequence).

sp Serpentinized ultramafic rock

Holocene stream terrace deposits- Sediment deposited in

point bar and overbank settings. Inlcudes sand, gravel, silt,

and minor clay. Moderately to well sorted and bedded.

Unit Explanation

Holocene (<10,000 years) estuarine deposits (bay mud). Holocene sediments deposited in

a tidal marsh, estuary, delta, or lagoon. Sediments are silts, fine sands,

peats, and clays.

(See Knudsen and others, 2000, for more information on

Quaternary units).

Unit Correlation

}Quaternary

}

}

}

Tertiary

Cretaceous

Jurassic

}}

Holocene

Pleistocene

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STATE OF CALIFORNIA- GRAY DAVIS, GOVERNOR

THE RESOURCES AGENCY- MARY NICHOLS, SECRETARY FOR RESOURCES

DEPARTMENT OF CONSERVATION- DARRYL YOUNG, DIRECTOR

CALIFORNIA GEOLOGICAL SURVEY

JAMES F. DAVIS, STATE GEOLOGIST

Copyright © 2002 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."

GEOLOGIC MAP OF THE

NOVATO 7.5' QUADRANGLE

MARIN AND SONOMA COUNTIES, CALIFORNIA: A DIGITAL DATABASEVERSION 1.0

By

Salem R. Rice1, Theodore C. Smith1, Rudolph G. Strand1, David L. Wagner1,

Carolyn E. Randolph-Loar2, Robert C. Witter2 and Kevin B. Clahan1

Digital Database

by:

Jason D. Little1 and Victoria D. Walker

1

2002

1. California Geological Survey, 801 K St. MS 12-31, Sacramento, CA 95814

2. 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

References

Berkland, J.O., 1969, Geology of the Novato quadrangle, Marin County, California: M.S.

Thesis, San Jose State College, 146 p.

Blake, M.C., Jr., Graymer, R.W., and Jones, D.L., 2000, Geologic map and database of

parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma

counties, California : U.S. Geological Survey Miscellaneous Field Studies,

MF 2337, ver. 1.0, 29 p.

Knudsen, K.L., Sowers, J.M., Witter, R.C., Wentworth, C.M., and Helley, E.J., 2000,

Preliminary geologic maps of Quaternary deposits and liquefaction

susceptibility, nine county San Francisco Bay Region, California: A

digital database: U.S. Geological Survey Open-File Report 00-444, ver. 1

Rice, S.R., Smith, T.C., and Strand, R.G., 1976, Geology for planning: Central and

southeastern Marin County, California: California Division of Mines and

Geology Open-File Report 76-2, 114 p.

Rice, S.R., 1975, Geology for planning, Novato area, Marin County, California:

California Department of Conservation, Division of Mines and Geology,

Open-File Report 75-1, 57 p.

Rice, S.R., 1973, Geology and geologic hazards of the Novato area, Marin County,

California: California Division of Mines and Geology Preliminary Report 21,

47 p.