1


U.S. DEPARTMENT OF THE INTERIOR
U.S. Geological  Survey 





Index to Detailed Maps of Landslides in the San Francisco Bay
Region, California


By Richard J. Pike1




Rapid public access to detailed map information on
landslides in the ten-county San Francisco Bay
region is facilitated by a table keyed to
7.5' topographic quadrangles




OPEN-FILE REPORT 97-745 D

1997





This report is preliminary and has not been reviewed for conformity with U.S. 
Geological Survey editorial standards or with the North American Stratigraphic 
Code.  Any use of trade, product, or firm names is for descriptive purposes only 
and does not imply endorsement by the U.S. Government.

This database, identified as "Index to Detailed Maps of Landslides in the San 
Francisco Bay Region, California," has been approved for release and publication 
by the Director of the USGS.  Although this database has been subjected to 
rigorous review and is substantially complete, the USGS reserves the right to 
revise the data pursuant to further analysis and review.  Furthermore, it is 
released on condition that neither the USGS nor the United States Government may 
be held liable for any damages resulting from its authorized or unauthorized 
use.

1Menlo park, ca  94025

Index to Detailed Maps of Landslides in the San Francisco
Bay Region, California

by
Richard J. Pike


Abstract:  A table keyed to 171 topographic quadrangles on a new 1:275,000-scale 
shaded-relief map speeds access to information on landslide locations in the 
ten-county San Francisco Bay region.  Detailed maps showing individual 
landslides in nearly any area of interest can be found quickly by knowing only 
the name of the appropriate 7.5' quadrangle.  The some-80 technical reports that 
contain these maps may be consulted in the U.S. Geological Survey's Menlo Park 
library collection.


Introduction

The ten counties that comprise the greater San Francisco Bay region1 occupy some 
7600 square miles, exclusive of water bodies, much of it in sloping ground.  
Most of the land that is not flat terrain is subject to landslides and other 
types of slope failure (Nilsen and others, 1979; Wieczorek and others, 1988).  
Landslides are much more common features of the Bay Region landscape than is 
generally realized.  Some 75,000 of themÑranging widely in age, size, and type 
and degree of activityÑhave been mapped within just the ten counties.  Depending 
on location, the number of landslides identified averages about ten per square 
mile and varies from zero to 40.

It is often necessary to find out whether a landslide exists at a particular Bay 
Area locale.  Homeowners, landscape architects, real estate developers, city 
planners, building officials, emergency-response personnel, civil engineers, 
utilities workers, and others all have occasion to know where the landslides 
are.  Because existing old and ancient landslides may be reactivated by severe 
winter storms (Nilsen and others, 1976), timely availability of information on 
landslide location can reduce losses of life and property to the region's 
expanding population (San Francisco Bay Landslide Mapping Team, 1997).


Access to Information

Current access to detailed data on landslide locations is poor.  Although this 
information has been generalized for the Bay region, the coarse-scale maps do 
not identify individual landslides (Nilsen and others, 1979; Wentworth and 
others, 1997).  Information on individual landslide occurrences is available, 
but not readily, and it does not yet exist in a form that can be retrieved 
quickly.  Rather, the data are scattered among dozens of paper maps included in 
the often hard-to-find technical reports by government geologists.  The 
published lists that include these maps and reports are no longer complete or 
current (Nilsen and others, 1979; Alger and Brabb, 1985; Taylor and Brabb, 
1986), some of the earlier reports are out-of-print, and few Bay Region 
libraries have them.

Detailed maps that show the location of individual landslides in the the San 
Francisco Bay region can be consulted by the public at the U.S. Geological 
Survey's Western Center library in Menlo Park.  These "landslide-inventory" 
maps, all at scales of l:62,500 scale (one inch = one mile) or better, have been 
prepared over the last 35 years by geologists of the Geological Survey, the 
California Division of Mines and Geology, and private consulting firms.  The 
USGS Library has on file nearly 80 different reports that contain these maps.  
The area covered by each report varies greatly, from a small irregularly-shaped 
fraction of one 7.5' USGS quadrangle to blocks of many quadrangles.  Landslides 
identified in more than half of the Bay Region's 171 quadrangles (or those parts 
of them within the ten-county area) are mapped at the relatively large scale of 
1:24,000 (one inch = 3/8 mile).

Although virtually the entire Bay Region is covered by detailed landslide maps2, 
it is not easy to find the map for a particular area of interest.  First, no 
single index map shows the exact areal coverage of all 78 landslide-inventory 
maps, many of which overlap.  (Such a highly complex index map would be 
difficult to read.)  Moreover, occasional users of the USGS Western Center 
library (and other libraries) will find that landslide reports and maps are not 
grouped together in one place.  Rather, they exist in different series of 
Federal and State publications, located in different parts of the library.  One 
must know which document is needed, its library call number, and then where to 
look for it.  The process can be time-consuming and frustrating.

This report enables visitors to the USGS Menlo Park library to quickly find the 
detailed landslide map they need.  Access to the proper documents is achieved 
through a table keyed to standard USGS 7.5' quadranglesÑa proxy for a true index 
map, plus the library location of each document.  It is not necessary to consult 
either the library's card catalog or its computer terminals.


Finding landslides in your area

The 75-plus geologic reports compiled here contain all the published landslide-
inventory maps for the San Francisco Bay region that I have been able to verify.  
Table 1 specifies which of those reports cover each of the the 171 quadrangles 
(or some fraction thereof) on the accompanying index map (Figure 1).  Besides 
quadrangle boundaries, this 1:275,000-scale mapÑmodified from a new shaded-
relief image (Graham and Pike, 1997)Ñcarries county boundaries and a major-road 
network to aid in locating a specific area of interest.  The list of landslide 
reports appended to Table 1 includes call numbers and shelf locations in USGS's 
Menlo Park library.  All but a handful of these reports currently are in this 
library; those few not shelved at the time of writing will be added as they 
become available.

A detailed landslide map for all but a few areas within the ten counties may be 
found by the following steps:

1.  Determine, if not already known, which 7.5' topographic quadrangle(s) 
cover(s) the area of interest.  Use the index map (Figure 1) or, for greater 
precision, the quadrangle maps themselves.  (7.5' quadrangles, the Nation's 
standard reference maps, show individual streets and roads.  All 171 quadrangles 
for the ten-county Bay Region are filed alphabetically in the California Center 
at the USGS Menlo Park library.  Ask a USGS librarian for assistance, if 
needed.)

2.  Go to Table 1 of this report and find the quadrangle name in the 
alphabetized list in column 1.  Column 3 on the same line has one or more unique 
ID codes; for example, "MF344".  The ID codes, mostly publication-series 
numbers, identify the documents that contain landslide maps for that quadrangle.  
A bibliography of these documents, arranged in order of alphabetized ID codes, 
follows Table 1.  

If more two or more ID codes are listed, then more than one map is available for 
that quadrangle or parts of it.  Be aware that landslide maps differ widely in 
the amount of area covered, the shape of that area, and the degree of detail.  
Check the document list for the date and scale of the maps indicated.  More 
recent reports commonly are more complete; most maps will be at 1:24,000 scale 
(more detail) or 1:62,500 scale (less detail).

3.  The USGS library call number and location of the document are given in 
boldface type after each reference in the list.  Library locations include 
stacks (shelves) numbered from 1 to 35, flat files (map drawers) numbered from 1 
to 13, and unnumbered stacks in the California Center.  Identical copies of 14 
maps are shelved in three different locations: stacks 4 and 35 and the 
California Center.

4.  Check the selected report to see that its map covers the area wanted.  
Small-area landslide maps commonly include less than 100% of a 7.5' quadrangle 
or that part of it lying within the ten-county region.  The reduced coverage by 
local-area maps is indicated in column 3 of Table 1 by such qualifying terms as 
"some," "minor," or "trace."

Certain large-area maps also include only parts of quadrangles.  For example, 
the map coded "MF344" has just a small part of the Big Basin quadrangle; the map 
coded "CCA75" would be needed to find landslides for most localities in that 
quadrangle.  If one map does not include the area of interest in a quadrangle, 
consult other maps indicated by ID codes until the desired coverage is obtained.


Cautions to users Ñ general

This map collection, although an excellent record of the Bay Region landslide 
hazard, has limitations.  The near-total coverage of the ten-county area does 
not mean near-100% identification of the landslides themselves.  Most of the 
maps were prepared by interpretation of aerial photographs rather than by field 
study.  They are preliminary or reconnaissance inventories, not exhaustive 
records of slope failures.  Inclusivity of landslides varies from map to map, 
depending on date of the airphotos; publication scale of the map; landslide 
size, type, age or degree of degradation; density of tree cover; and each 
geologist's experience and mapping philosophy.  The maps appended to Table 1 
probably underestimate the total number and extent of Bay Region landslides.

The landslide-inventory maps cited here should be regarded as guides to what 
actually may exist on the ground.  Indication of a landslide on a map in a 
particular locale does not guarantee the presence of an actual landslide.  
Similarly, the absence of a landslide on a map does not guarantee that a 
landslide does not exist on the ground.  The maps indicate what may be expected, 
but they do not take the place of an on-site survey or the professional judgment 
of a licensed engineering geologist or geotechnical engineer.  


Cautions to users Ñ debris flows

Most landslides on the inventory maps described in this report are of the types 
collectively referred to as "slides" and "earth flows"Ñwhich may move slowly 
during, and even weeks to months after, the Northern California rainy season 
(Wentworth and others, 1997).  The landslide maps referenced here include 
comparatively few of the type of slope failure known as a "debris flow."  
Commonly called "mudslides", debris flows are small, shallow mixtures of water 
and soil that mobilize suddenly during locally heavy rains, quickly sweeping 
down steep gullies and leaving thin deposits of material that do not markedly 
distort the ground surface.  Over time, debris flows may reoccur in the same 
location.

Debris flows are common in the Bay Area (Wieczorek and others, 1988), but they 
are identified on only some of the landslide-inventory maps listed hereÑthe more 
recent 1:24,000-scale open-file reports by the California Department of Mines 
and Geology.  Few debris flows are shown on maps prepared before the Region's 
most recent severe winter (1982) because their recognition features are quickly 
obscured by vegetation.  For example, locations of 18,000 debris flows generated 
by the January 1982 rains were mapped, but from airphotos taken immediately 
after the storm (Wieczorek and others, 1988).
Thus, it is not possible to compile a historic inventory of debris flows 
comparable to that of slides and earth flows.  However, the debris-flow hazard 
to a particular area may be evaluated indirectly by other means (Campbell and 
others, 1994; Mark and Ellen, 1995; Ellen and others, 1997).  Actual reduction 
of the risk resulting from this hazard may require real-time analysis and 
warning (Wilson, 1997; Wilson and Jayko, 1997).


The Digital Database

No paper maps accompany this document or the other five reports in the San 
Francisco Bay Region Landslide Folio.  Rather, the Folio is released as a 
digital database that can be obtained by either (1) connecting with a USGS Web 
page, (2) through anonymous ftp (file transfer protocol) over the Internet, or 
(3) sending a request, accompanied by a blank magnetic tape, to USGS.  Available 
in two data formats (ARC/INFO Export-compatible or PostScript), the map files 
described here can be plotted on the user's equipment or that of a commercial 
vendor.

The digital compilation was performed in ARC/INFO, a commercial Geographic 
Information System (Environmental Research Institute [ESRI], Redlands, 
California).  The database for the Landslide Index comprises a quadrangle-index 
map consisting of an ARC/INFO coverage for the ten-county region, a PostScript 
map-image file for the region, a PostScript version of this pamphlet, and a 
text-only version of the pamphlet.  See San Francisco Bay Landslide Mapping Team 
(1997) for information about filenames and how to obtain the data and plotfiles.

The data files are as follows:

	sfbr-qi.e00		-ARC/INFO Export file of quadrangle index map
	sfbr-qi.ps		-PostScript map-image plotfile of the index map
	sfbr-qi-dbsesc.ps	-PostScript version of this pamphlet
	sfbr-qi.dbdesc.txt	-ASCII text version of this pamphlet

The map database itself is rather simple, consisting of unattributed arcs 
(quadrangle grid lines) and polygons with associated quadrangle names; these are 
stored in Universal Transverse Mercator (UTM) projection (Table 1).  Digital 
tics, which define a 7.5-minute grid of latitude and longitude, correspond to 
corners of 7.5' quadrangles that fall within the map area.

Table 1 - Map Projection

PROJECTION		UTM
UNITS			meters
ZONE			   10
DATUM			NAD27
PARAMETERS		none


Content of the map database is described in terms of the arcs, polygons, and 
annotations comprising the map.  Descriptions of the database fields use the 
terms explained in Table 2.

Table 2 - Field Definition Terms

ITEM NAME	name of the database field (item)
WIDTH		maximum number of digits or characters stored
OUTPUT		output width
TYPE			B-binary integer, F-binary floating-point number,
				I-ASCII integer, C-ASCII character string
N.DEC		number of decimal places maintained for floating-
				point numbers


Arcs (lines) are recorded as strings of vectors and are described in the arc 
attribute table (AAT:  Table 3).  They define edges of the 7.5' quadrangles.  
The name of the table is SFBR-QI.AAT.


Table 3 - Content of the Arc Attribute Tables

ITEM NAME		WIDTH	OUTPUT	TYPE		N.DEC.

FNODE#		      4		      5		    B		     - -	
	starting node of 										
	arc (from node)

TNODE#		      4		      5		    B		     - -	
	ending node of 										
	arc (to node)

LPOLY#		      4		      5		    B		     - -	
	polygon to the 										
	left of the arc

RPOLY#		      4		      5		    B		     - -	
	polygon to the 										
	right of the arc

LENGTH		      4		    12		    F		      3	
	length of arc 
											in meters

SFBR-QI#		      4		      5		    B		     - -	
	unique internal
											control number

SFBR-QI-ID		      4		      5		    B		     - -	
	unique identifi-
											cation number


Polygons (areas) are described in the polygon attribute table (PAT:  Table 4).  
They define the areas of the 7.5' quadrangles.  The name of the table is SFBR-
QI.PAT.


Table 4 - Content of the Polygon Attribute Tables

ITEM NAME		WIDTH	OUTPUT	TYPE		N.DEC.

AREA		      4		    12		    F		     3	
	area of  polygon
											in square 
meters

PERIMETER		      4		    12		    F		     3	
	length of peri-
											meter in 
meters

SFBR-QI#		      4		      5		    B		     - -	
	unique internal
											control number

SFBR-QI-ID		      4		      5		    B		     - -	
	unique identifi-
											cation number

NAME		    35		    35		    C		     - -	
	unit label


The index-map database also contains annotation.  The quadrangle names have been 
placed to appear diagonally within each quadrangle polygon.




Acknowledgments:

Earl Brabb and Melanie Moreno contributed to this report.  Scott Graham, Carl 
Wentworth and Gregg Beukelman created the index map.



References

Alger, C.S., and Brabb, E.E., 1985, Bibliography of United States landslide maps 
and reports: U. S. Geol. Survey Open-file Report 85-585, 119 p.

Campbell, R.H., Bernknopf, R.L., and Soller, D.R., 1994, Mapping time-dependent 
changes in soil slip-debris flow probability: U.S. Geol. Survey Open-file Report 
94-699, 66 p., map scales 1:24,000 and 1:40,000.

Ellen, S.D., Mark, R.K., Wieczorek, G.F., Wentworth, C.M., Ramsey, D.W., and 
May, T.E., 1997, Map Showing Principal debris-flow source areas in the San 
Francisco Bay Region, California: U.S. Geological Survey, Open-file Report 97-
745 E, map scales 1:275,000 and 1:125,000.

Graham, S.E., and Pike, R.J., 1997, Shaded-relief map of the San Francisco Bay 
Region, California: U.S. Geological Survey, Open-file Report 97-745 B, map 
scales 1:275,000 and 1:125,000.

Mark, R.K., and Ellen, S.D., 1995, Statistical and simulation models for mapping 
debris-flow hazard, in Carrara, Alberto, and Guzzetti, Fausto, eds., 
Geographical Information Systems in Assessing Natural Hazards: Amsterdam, 
Kluwer, p. 93-106 and 345.

Nilsen, T.N., Taylor, F.A., and Dean, R.M., 1976, Natural conditions that 
control landsliding in the San Francisco Bay RegionÑan analysis based on data 
from the 1968-69 and 1972-73 rainy seasons: U.S. Geol. Survey Bulletin 1424, 35 
p., map scale 1:250,000.

Nilsen, T.N., Wright, R.H., Vlasic, T.C., and Spangle, W.E., 1979, Relative 
slope stability and land-use planning in the San Francisco Bay Region, 
California: U.S. Geol. Survey Prof. Paper 944, 96 p., map scale 1:125,000.

San Francisco Bay Landslide Mapping Team, 1997, Introduction to the San 
Francisco Bay Region, California, Landslide Folio: U.S. Geological Survey Open-
file Report 97-745 A.

Taylor, Fred, and Brabb, E.E., 1986, Map showing the status of landslide 
inventory and susceptibility mapping in California: U.S. Geol. Survey Open-file 
Report 86-100, 40 p., map scale 1:1,000,000.

Wentworth, C.M., Graham, S.E., Pike, R.J., Beukelman, G.S., Ramsey, D.W., and 
Barron, A.D., 1997, Summary distribution of slides and earth flows in the San 
Francisco Bay Region, California: U.S. Geological Survey, Open-file Report 97-
745 C, map scales 1:275,000 and 1:125,000.

Wieczorek, G.F., Harp, E.L., Mark, R.K., and Bhattacharyya, A.K., 1988, Debris 
flows and other landslides in San Mateo, Santa Cruz, Contra Costa, Alameda, 
Napa, Solano, Sonoma, Lake, and Yolo counties, and factors influencing debris-
flow distribution, in Ellen, S.D., and Wieczorek, G.F., eds., Landslides, Floods 
and Marine Effects of the Storm of January 3-5, 1982, in the San Francisco Bay 
Region, Califrnia: U.S. Geol. Survey Prof. Paper 1434, p. 133-162.

Wilson, R.C., 1997a, Operation of a landslide warning system during the 
California storm sequence of January and February 1993, in Larson, R.A., and 
Simpson, J.E., eds., Storm-induced Geologic Hazards: Case Histories from the 
1992-1993 Winter in Southern California and Arizona: Boulder, Colorado, Geol. 
Soc. America Reviews in Engineering Geology, v. XI, p. 61-70.

Wilson, R.C., and Jayko, A.S., 1997, Preliminary Maps Showing Rainfall 
Thresholds for Debris-Flow Activity, San Francisco Bay Region, California: U.S. 
Geological Survey, Open-file Report 97-745 F.


Table 1

Detailed landslide-inventory maps of the San Francisco Bay region,
by 7.5' topographic quadrangle and county



   Name
   of 7.5'		County			Landslide Map ID**
Quadrangle


Aetna Springs	Napa	OF76-074
Allendale	Solano	MF719, some OFR89-17
Altamont	Alameda	MF321, OF75-277, OFR91-02
Annapolis	Sonoma	SR120, minor PR16
Ano Nuevo	Santa Cruz	CCA75, OFR91-05, OFR84-06, trace MF344
Antioch North	Solano/Contra Costa	MF322, OF75-277
Antioch South	Contra Costa	MF310, OF75-277
Arched Rock	Sonoma	PR16, SR120
Asti	Sonoma	MF594, SR120, trace OF74-238, SR122, & SR142
Benicia	Solano/Contra Costa	MF595, OF75-277, much OFR86-17, minor OFR95-
12
Bethany	Contra Costa/Alameda	obsolete map name (see Clifton Court 
Forebay)
Big Basin	Santa Cruz/San Mateo	most CCA75, minor MF344, OFR91-05, some 
OFR84-06
Big Foot Mtn	Sonoma	MF594, SR120
Birds Landing	Solano	MF322
Bodega Head	Sonoma/Marin	PR20, SR120, trace OFR72-22
Bolinas	Marin	OF75-281, some OFR77-15
Bouldin Island	Contra Costa	MF322, OF75-277
Brentwood	Contra Costa	MF338, OF75-277
Briones Valley	Contra Costa	MF493, OF75-277, some OFR95-12
Brooks	Napa	MF719
Byron Hot Springs	Contra Costa/Alameda	MF338, OF75-277, OFR92-05
Calaveras Reservoir	Santa Clara/Alameda	MF339, OF75-277, much CCA74, 
some MF361 & NC95
Calistoga	Napa/Sonoma	OF76-074, SR120
Camp Meeker	Sonoma	SR120, much OFR81-12
Capell Valley	Napa	OF76-074, MF719
Castle Rock Ridge	Santa Cruz/Santa Clara	most CCA75, some OFR72-21, OFR91-05, 
trace MF643
Cazadero	Sonoma	OF76-074, SR120
Cedar Mtn	Alameda	MF321, OF75-277
Chiles Valley	Napa	OF76-074
Chittenden	Santa Clara	OFR91-05, some OFR80-11 & OFR94-02, trace PR18, & CCA75
Clayton	Contra Costa	MF310, OF75-277
Clifton Court Forebay	Contra Costa/Alameda	MF338, OF75-277
Cloverdale	Sonoma	MF594, SR120
Cordelia	Solano/Napa	MF595, OFR88-22
Cotati	Sonoma	OF76-074, SR120, some OFR72-25, trace OFR86-05
Courtland	Solano	MF719
Crevison Peak	Santa Clara	MF416, OF75-277
Cupertino	Santa Clara	some MF643 & PR17, minor OFR72-21 & CCA74, trace OFR91-
05 & CCA75
Cuttings Wharf	Napa/C. Costa/Sonoma	MF595, minor OFR88-22
Davenport	Santa Cruz	CCA75, OFR91-05, minor OFR84-06
Davis	Solano	MF719
Denverton	Solano	MF322
Detert Reservoir	Napa	OF76-074
Diablo	Contra Costa/Alameda	MF310, OF75-277, much OFR86-07, much OFR95-
15
Dixon	Solano	MF719
Double Point	Marin	OF75-281
Dozier	Solano	MF719
Drakes Bay	Marin	OF75-281, trace OFR77-15


  Quadrangle	     County		Landslide Map ID


Dublin	Alameda/Contra Costa	MF519, OF75-277, much OFR91-02 & OFR95-14, 
minor OFR86-07
Duncan Mills	Sonoma	SR120, some PR20, minor PR16
Elmira	Solano	MF719, much OFR89-17
Eylar Mtn	Santa Clara/Alameda	MF339, OF75-277
Fairfield North	Solano/Napa	OF76-074, MF719, OFR87-09, OFR89-17
Fairfield South	Solano	MF595, trace OFR88-22
Felton	Santa Cruz	CCA75, OFR91-05
Fort Ross	Sonoma	OF76-074, SR120, minor PR16
Franklin Point	San Mateo/Santa Cruz	much MF344, CCA75, & OFR84-06
Geyserville	Sonoma	OF85-711, SR120
Gilroy Hot Springs	Santa Clara	MF416, OF75-277, minor OFR78-11
Gilroy	Santa Clara	some MF416 & OF75-277, minor PR18, OFR78-11, & OFR78-12
Glen Ellen	Sonoma	OF76-074, SR120, some OFR72-25
Gualala	Sonoma	PR16, SR120
Gude Mountain	Sonoma	SR120
Guerneville	Sonoma	OF85-711, SR120
Guinda	Napa	MF677
Half Moon Bay	San Mateo	MF344
Hayward	Alameda	MF519, OF75-277, OFR95-14
Healdsburg	Sonoma	OF85-711, SR120, much ORF79-15; trace OFR77-13
Honker Bay	Contra Costa/Solano	MF322, OF75-277
Hunters Point	San Mateo/S.F.	MF344, OF65-18, MF311, and OF500
Inverness	Marin	OF75-281, minor OFR77-15, trace OFR84-22
Isabel Valley	Santa Clara	MF339, OF75-277
Isleton	Solano	MF322
Jericho Valley	Napa	MF677
Jersey Island	Contra Costa/Solano	MF322, OF75-277
Jimtown	Sonoma	OF85-711, SR120, minor OF74-238, SR122, & SR142, trace 
OFR79-15
Kenwood	Sonoma/Napa	OF76-074, SR120
Knoxville	Napa	MF677
La Costa Valley	Alameda	MF519, OF75-277, OFR9x-xx
La Honda	San Mateo	MF344, minor MF1422
Lake Berryessa	Napa	MF719
Las Trampas Ridge	Contra Costa/Alameda	MF493, OF75-277, OFR95-15
Laurel	Santa Cruz	CCA75, OF89-676, OFR91-05, minor OFR90-06, trace CCA74
Liberty Island	Solano	MF719
Lick Observatory	Santa Clara	MF339, OF75-277, much CCA74
Livermore	Alameda	MF519, OF75-277, OFR91-02
Loma Prieta	Santa Cruz/Santa Clara	CCA75, OF88-752, OFR91-05, trace CCA74 & 
OFR72-21
Lone Tree Creek	Alameda	MF321, OF75-277
Los Gatos	Santa Clara/Santa Cruz	OF91-593 & OFR91-05, much OFR72-21, some 
CCA74 & CCA75, trace MF643 & OFR90-6
Mare Island	Contra Costa/Solano	MF595, OF75-277, trace PR19
Mariposa Peak	Santa Clara	MF416, OF75-277
Mark West Springs	Sonoma/Napa	OF76-074, SR120, much OFR77-13, minor OFR72-25, 
trace OFR79-15
McGuire Ridge	Sonoma	SR120, minor PR16
Mendenhall Springs	Alameda	MF321, OF75-277
Merritt	Solano	MF719
Midway	Alameda	MF321, OF75-277
Milpitas	Santa Clara/Alameda	MF339, OF75-277, much CCA74
Mindego Hill*	S.Mateo/S.Clara/S.Cruz	MF344, OFR91-05, minor PR17 & CCA75, 
trace PV
Mississippi Creek	Santa Clara	MF416, OF75-277, some CDPR
Montara Mtn	San Mateo	I-2390, MF344
Monticello Dam	Solano/Napa	MF719
Morgan Hill	Santa Clara	most MF416, OF75-277 & CCA74, minor PR18, trace OFR78-12
Moss Landing	Santa Cruz	CCA75, OFR91-05
Mount St Helena	Sonoma/Napa	OF76-074, SR120, some CCA76


  Quadrangle	     County		Landslide Map ID


Mountain View	Santa Clara/Alameda	minor CCA74 & PR17, trace MF344
Mt Boardman	Santa Clara/Alameda	MF339, OF75-277
Mt Day	Santa Clara/Alameda	MF339, OF75-277, trace CCA74
Mt George	Napa/Solano	OF76-074, MF719
Mt Madonna*	Santa Clara/Santa Cruz	some PR18, minor CCA75 & MF416
Mt Sizer	Santa Clara	MF416, OF75-277, some OFR78-12 & CDPR, minor CCA74
Mt Stakes	Santa Clara	MF339, OF75-277
Mt Vaca	Solano	OF76-074, MF719, much OFR89-17
Mustang Peak	Santa Clara	MF416, OF75-277
Napa	Napa	OF76-074, OFR95-16
Newark	Alameda	MF519, OF75-277, OFR9x-xx
Niles	Alameda	MF519, OF75-277, OFR9x-xx
Novato	Marin	OF75-281, much PR21, some OFR72-22, minor OFR76-02, trace 
OFR84-22
Oakland East	Alameda/Contra Costa	MF493, OF75-277
Oakland West	Alameda	MF493, OF75-277
Pacheco Pass	Santa Clara	MF416, OF75-277
Pacheco Peak	Santa Clara	MF416, OF75-277
Palo Alto	San Mateo/Santa Clara	I-2371, MF344, minor W & PV, trace PR17
Petaluma	Marin/Sonoma	OF75-281, much OFR86-05, trace PR21
Petaluma Point	Marin	MF595, OFR76-02, PR21
Petaluma River	Sonoma/Marin	OF75-281, some PR21, minor OFR86-05
Pigeon Point	San Mateo	MF344
Plantation	Sonoma	PR16, SR120
Point Bonita	Marin	most MF574, some OFR72-22, much OFR76-02, some OFR84-22, 
trace PP782
Point Reyes NE	Marin/Sonoma	most OF75-281, much MF1406& PP1434, trace 
OFR77-15
Port Chicago	Contra Costa/Solano	obsolete map name (see Vine Hill)
Redwood Point	San Mateo/Alameda	MF344, minor MF519 & OF75-277
Richmond	Contra Costa/Alameda	MF493, OF75-277, much PR19
Rio Vista	Solano	MF322
Rutherford	Napa/Sonoma	OF76-074, SR120
San Felipe	Santa Clara	MF416, OF75-277, OFR93-01, some OFR78-11
San Francisco North	S.F./Marin	most PP782 & I-272, minor MF574, minor 
OFR84-22
San Francisco South	S.F./San Mateo	most MF344, some OF65-18, MF311, & 
OF500
San Geronimo	Marin	OF75-281, minor OFR76-02, trace PR21
San Gregorio	San Mateo	MF344
San Jose East	Santa Clara	MF339, OF75-277, CCA74
San Jose West	Santa Clara	MF339, much CCA74
San Leandro	Alameda	MF519, OF75-277
San Mateo	San Mateo	I-2390, MF344
San Quentin	Marin/Contra Costa	OF75-281, MF-493, OF75-277, OFR76-02, OFR84-
22, PR19 (some of each)
San Rafael	Marin	OF75-281, much OFR76-02, much OFR84-22
Santa Cruz	Santa Cruz	CCA75, OFR91-05
Santa Rosa	Sonoma	OF76-074, SR120, some OFR88-5
Santa Teresa Hills*	Santa Clara	CCA74, trace MF416, OF75-277 & OFR72-21
Saxon	Solano	MF719
Sears Point	Sonoma	MF595
Sebastopol	Sonoma	SR120
Skaggs Springs	Sonoma	obsolete map name (see Warm Springs Dam)
Sonoma	Sonoma/Napa	OF76-074, SR120
Soquel	Santa Cruz	CCA75, OFR91-05
St Helena	Napa	OF76-074
Stewarts Point	Sonoma	SR120, some PR16
Tassajara	Contra Costa/Alameda	MF310, OF75-277, OFR92-05
The Geysers	Sonoma	MF594, SR120, OF74-238, SR122, SR142
Three Sisters	Santa Clara	MF416, OF75-277
Tomales	Marin	most OF75-281, much MF1406 & PP1434
Tombs Creek	Sonoma	OF76-074, SR120


  Quadrangle	     County		Landslide Map ID


Two Rock*	Sonoma/Marin	most SR120
Valley Ford*	Marin/Sonoma	some SR120, minor OFR81-12, minor OFR72-22
Vine Hill	Contra Costa/Solano	MF595, OF75-277, minor OFR86-17, trace 
OFR95-12
Walnut Creek	Contra Costa	MF493, OF75-277, most OFR95-12, 1/4 MS16
Walter Springs	Napa	OF76-074
Warm Springs Dam	Sonoma	OF76-074, SR120
Watsonville East	Santa Cruz/Santa Clara	CCA75, OFR91-05
Watsonville West	Santa Cruz	CCA75, OFR91-05
Whispering Pines	Sonoma	OF74-238, SR122, SR142, SR120
Winters	Solano	MF719
Woodside	San Mateo	MF344, minor W
Woodward Island	Contra Costa	MF338, OF75-277
Yountville	Napa	OF76-074


 * detailed landslide maps are not available for entire quadrangle

** types of reports represented by ID codes:

U.S. Geological Survey (USGS) series
   I   = Miscellaneous Investigation Map
 MF = Miscellaneous Field Study
  OF = Open-file Report
  PP = Professional Paper

California Division of Mines & Geology (CDMG) series
  MS = Map Sheet
OFR = Open-file Report
  PR = Preliminary Report
  SR = Special Report

Other sources
  CCA = Cooper-Clark Associates contract report
CDPR = CA Dept. of Parks & Recreation report
    NC = Norfleet Consultants
     W = geologic map of the Town of Woodside
    PV = geologic map of the Town of Portola Valley



Documents containing detailed landslide-inventory maps
for the ten-county San Francisco Bay Region,
keyed to Table 1 ID codes in alphabetical order


CCA74 Ñ Cooper-Clark and Associates, 1974, Landslides and landslide 
susceptibility, in Technical Report, Geotechnical Investigation, City of San 
Jose's Sphere of Influence for the City of San Jose: San Jose, CA, Department of 
Public Works, p. 17-35 and plates 1-A and 1-B (landslides), map scale 1:48,000.
		*203.3(276) Sa522tr   [locked stack; ask librarian]
CCA75 Ñ Cooper-Clark and Associates, 1975, Preliminary map of landslide deposits 
in Santa Cruz County, in Seismic Safety Element of the County General Plan: 
Santa Cruz County, CA, Planning Department, 1 sheet, map scale 1:62,500.
	*203.3(276) Sa59s   [locked stack; ask librarian]
CCA76 Ñ Dwyer, M.J., and Noguchi, Naohiko, 1976, Regional Landslide Map, 
Geysers-Cow Mountain Study Area, Mendocino, Lake and Sonoma Counties, 
California: Cooper-Clark and Associates, U.S. Bureau of Land Management Contract 
No. YA-512-LT6-83, Ukiah District Office, CA, 8 sheets, map scale 1:12,000.	
	recently to library; no number yet 
CDPR Ñ Willard, Syd, 1984, Landslide Inventory of the Henry Coe Park: Calif. 
Dept. Parks and Recreation, Sacramento, CA, map scale 1:24,000.		not yet 
in library
I-272 Ñ Schlocker, Julius, Bonilla, M.G., and Radbruch, D.H., 1958, Geology of 
the San Francisco North quadrangle, California: U.S. Geol. Survey Misc. Geol. 
Inves. Map I-272, scale 1:24,000.	M(200) vI no.272	stack 35
I-2371 Ñ Pampeyan, E.H., 1993, Geologic map of the Palo Alto and part of the 
Redwood Point 7-1/2' quadrangles, San Mateo and Santa Clara Counties, 
California: U.S. Geol. Survey Misc. Geol. Inves. Map I-2371, 26 p., scale 
1:24,000.		M(200) vI no.2371	stack 35
I-2390 Ñ Pampeyan, E.H., 1994, Geologic map of the Montara Mountain and San 
Mateo 7-1/2' quadrangles, San Mateo County, California: U.S. Geol. Survey Misc. 
Geol. Inves. Map I-2390, 19 p., scale 1:24,000.		M(200) vI no.2390	stack 35
MF310 Ñ Nilsen, T.H., 1971, Preliminary photointerpretation map of landslide and 
other surficial deposits of the Mount Diablo area, Contra Costa and Alameda 
Counties, California: U.S. Geol. Survey Misc. Field Studies map MF-310, scale 
1:62,500 [BDC 31].		M(200) vMF no.310	stack 35;	and (200) Un3sfbd 
no.31	stack 4 and CA Center
MF311 Ñ Bonilla, M.G., 1971, Preliminary geologic map of the San Francisco South 
quadrangle and part of the Hunters Point quadrangle, California: U.S. Geol. 
Survey Misc. Field Studies map MF-311, scale 1:24,000 [BDC 29].	M(200) vMF 
no.311	stack 35;	(200) Un3sfbd no.29	stack 4 and CA Center
MF321 Ñ Nilsen, T.H., 1972a, Preliminary photointerpretation map of landslide 
and other surficial deposits of the Altamont and Carbona 15-minute quadrangles, 
Alameda County, California: U.S. Geol. Survey Misc. Field Studies map MF-321, 
scale 1:62,500 [BDC 34].	M(200) vUn3mf no.321	stack 35;	(200) Un3sfbd 
no.34	stack 4 and CA Center
MF322 Ñ Sim, J.D., and Nilsen, T.H., 1972, Preliminary photointerpretation map 
of landslide and other surficial deposits of parts of the Pittsburg and Rio 
Vista 15-minute quadrangles, Contra Costa and Solano Counties, California: U.S. 
Geol. Survey Misc. Field Studies map MF-322, scale 1:62,500 [BDC 35].	M(200) 
vMF no.322	stack 35;	(200) Un3sfbd no.35	stack 4 and CA Center
MF338 Ñ Nilsen, T.H., 1972b, Preliminary photointerpretation map of landslide 
and other surficial deposits of the Byron area, Contra Costa and Alameda 
Counties, California: U.S. Geol. Survey Misc. Field Studies map MF-338, scale 
1:62,500 [BDC 38].		M(200) vMF no.338	stack 35;	(200) Un3sfbd no.38
	stack 4 and CA Center
MF339 Ñ Nilsen, T.H., 1972c, Preliminary photointerpretation map of landslide 
and other surficial deposits of the Mount Hamilton quadrangle and parts of the 
Mount Boardman and San Jose quadrangles, Alameda and Santa Clara Counties, 
California: U.S. Geol. Survey Misc. Field Studies map MF-339, scale 1:62,500 
[BDC 40].	M(200) vMF no.339	stack 35;	(200) Un3sfbd no.40	stack 4 and CA 
Center
MF344 Ñ Brabb, E.E., and Pampeyan, E.H., 1972, Preliminary map of landslide 
deposits in San Mateo County, California: U.S. Geol. Survey Misc. Field Studies 
map MF-344, scale 1:62,500 [BDC 42].	M(200) vMF no.344	stack 35;	(200) 
Un3sfbd no.42	stack 4 and CA Center
MF361 Ñ Nilsen, T.H., and Brabb, E.E., 1972, Preliminary photointerpretation and 
damage maps of landslide and other surficial deposits in northeastern San Jose, 
Santa Clara County, California: U.S. Geol. Survey Misc. Field Studies map MF-
361, scale 1:24,000 [BDC 45].	M(200) vMF no.361	stack 35;	(200) Un3sfbd no.45
	stack 4 and CA Center
MF416 Ñ Nilsen, T.H., 1972d, Preliminary photointerpretation map of landslide 
and other surficial deposits of the Los Gatos, Morgan Hill, Gilroy, Gilroy Hot 
Springs, Pacheco Pass, Quien Sabe, and Hollister 15-minute quadrangles, Santa 
Clara County, California: U.S. Geol. Survey Misc. Field Studies map MF-416, 
scale 1:62,500 [BDC 46].	M(200) vMF no.416	stack 35;	(200) Un3sfbd no.46
	stack 4 and CA Center
MF493 Ñ Nilsen, T.H., 1973a, Preliminary photointerpretation map of landslide 
and other surficial deposits of the Concord 15-minute quadrangle and the Oakland 
West, Richmond, and part of the San Quentin 7.5-minute quadrangles, Contra Costa 
and Alameda Counties, California: U.S. Geol. Survey Misc. Field Studies map MF-
493, scale 1:62,500 [BDC 57].	M(200) vMF no.493	stack 35;	(200) Un3sfbd no.57
	stack 4 and CA Center
MF519 Ñ Nilsen, T.H., 1973b, Preliminary photointerpretation map of landslide 
and other surficial deposits of the Livermore and parts of the Hayward 15-minute 
quadrangles, Alameda and Contra Costa Counties, California: U.S. Geol. Survey 
Misc. Field Studies map MF-519, scale 1:62,500 [BDC 59].	M(200)4 vUn3mf 
no.519		stack 35;		(200) Un3sfbd no.59	stack 4 and CA 
Center
MF574 Ñ Blake, M.C., Bartow, J.A., Frizzell, V.A. Jr., Schlocker, J., Sorg, D., 
Wentworth, C.M., and Wright, R.H., 1974, Preliminary geologic map of Marin and 
San Francisco Counties and parts of Alameda, Contra Costa, and Sonoma Counties, 
California: U.S. Geol. Survey Misc. Field Studies map MF-574, scale 1:62,500 
[BDC 64].	M(200) vMF no.574	stack 35;	(200) Un3sfbd no.64	stack 4 and CA 
Center
MF594 Ñ Frizzell, V.A., Jr., 1974, Reconnaissance photointerpretation map of 
landslides in parts of the Hopland, Kelseyville, and Lower Lake 15-minute 
quadrangles, Sonoma County, California: U.S. Geol. Survey Misc. Field Studies 
map MF-594, scale 1:62,500 [BDC 66].	M(200)4 vUn3mf no.594	stack 35;
	(200) Un3sfbd no.66	stack 4 and CA Center
MF595 Ñ Frizzell, V.A., Jr., Sims, J.D., Nilsen, T.H., and Bartow, J.A., 1974, 
Preliminary photointerpretation map of landslide and other surficial deposits of 
the Mare Island and Carquinez Strait 15-minute quadrangles, Contra Costa, Marin, 
Napa, Solano, and Sonoma Counties, California: U.S. Geol. Survey Misc. Field 
Studies map MF-595, scale 1:62,500 [BDC 67].	M(200)4 vUn3mf no.595	stack 
35;	(200) Un3sfbd no.67	stack 4 and CA Center
MF643 Ñ Sorg, D.H., and McLaughlin, R.J., 1975, Geologic map of the Sargent-
Berrocal fault zone between Los Gatos and Los Altos Hills, Santa Clara County, 
California U.S. Geol. Survey Misc. Field Studies Map MF-643, scale 1:24,000.	
	M(200)4 vUn3mf no.643		stack 35
MF677 Ñ Wright, R.H., and Reid, G.O., 1975, Photointerpretlve map of landslides 
and surficial deposits of northernmost Napa County, California: U.S. Geol. 
Survey Misc. Field Studies Map MF-677, scale 1:24,000.	M(200)4 vUn3mf 
no.677		stack 35
MF719 Ñ Sims, J.D., and Frizzell, V.A., 1976, Preliminary photointerpretation 
map of landslides and other surficial deposits of the Mount Vaca, Vacaville, and 
parts of Courtland, Davis, Lake Berryessa, and Woodland 15-minute quadrangles, 
Napa and Solano Counties, California: U.S. Geol. Survey Misc. Field Studies Map 
MF-719, scale 1:62.500.	M(200)4 vUn3mf no.719	stack 35
MF1406 Ñ Ellen, Stephen, Peterson, D.M., and Reid, G.O., 1982, Map showing areas 
susceptible to different hazards from shallow landsliding, Marin County and 
adjacent parts of Sonoma County, California: U.S. Geol. Survey Misc. Field 
Studies Map MF-1406, 8 p., map scale 1:62,500.		M(200)4 vUn3mf no.1406	
	stack 35
MF1422 Ñ Wieczorek, G.F., 1982, Map showing recently active and dormant 
landslides near La Honda, central Santa Cruz Mountains, California: U.S. Geol. 
Survey Misc. Field Studies Map MF-1422, scale 1:4800.	M(200)4 vUn3mf no.1422	
	stack 35
MS 16 Ñ Saul, R.B., 1973, Geology and slope stability of the southwest quarter 
of the Walnut Creek 7.5-minute quadrangle, Contra Costa County, California: 
Calif. Div. Mines and Geology, Map Sheet 16, scale 1:12,000.		(276) 
C4m no. 16		stack 5 
NC95 Ñ Norfleet Consultants, 1995, Landslides, in Phase IA Regional Geologic 
Study of the Special Geologic Hazard Study Area, Final Report: City of San Jose, 
Department of Public Works, p. 45-67, plates C1-C13 (landslide maps, scale 
1:2400), and plate I (landslide areas map, 1 sheet, scale 1:12,000).	
	203.3(276) P4273 1995		stack 4	[Plates C1-13 missing]
OF500 Ñ Bonilla, M.G., 1960, Landslides in the San Francisco South quadrangle, 
California: U.S. Geol. Survey Open-file Report No. 500, 44 p., map scale 
1:24,000.	(200) R29o no.500	stack 3
OF65-18 Ñ Bonilla, M.G., 1965, Geologic map of the San Francisco South 
quadrangle, California: U.S. Geol. Survey Open-file Report No. 65-18, map scale 
1:20,000.	(200) R29o no.65-18	stack 3
OF74-238 Ñ McLaughlin, R.J., 1974, Preliminary geologic map of The Geysers steam 
field and vicinity, Sonoma County, California: U.S. Geol. Survey Open-file 
Report No. 74-238, map scale 1:24,000.		(200) R29o no.74-238	stack 3
OF75-277 Ñ Nilsen, T.H., Bartow, J.A., Frizzell, V.A., and Sims, J.D., 1975, 
Preliminary photo-interpretation maps of landslide and other surficial deposits 
of 56 7.5-minute quadrangles in the southeastern San Francisco Bay region, 
Alameda, Contra Costa, and Santa Clara Counties, California: U.S. Geol. Survey 
Open-file Report No. 75-277, scale 1:24,000.	M(200) R29o no.75-277	
	flat file 4
OF75-281 Ñ Wentworth, C.M., and Frizzell, V.A.,1975, Reconnaissance landslide 
map of parts of Marin and Sonoma Counties, California: U.S. Geol. Survey Open-
file Report No. 75-281, 12 maps, scale 1:24,000.	(200) R29o no.75-281	
	stack 3
OF76-074 Ñ Dwyer, M.J., Noguchi, N., and O'Rourke, J., 1976, Reconnaissance 
photointerpretation map of landslides in 24 selected 7.5-minute quadrangles in 
Lake, Napa, Solano, and Sonoma Counties, California: U.S. Geol. Survey Open-file 
Report No. 76-74, scale 1:24,000.	M(200) R29o no.76-074		flat file 4
OF85-711 Ñ Wentworth, C.M., 1985, Reconnaissance landslide map of the Healdsburg 
15-minute quadrangle, Sonoma County, California: U.S. Geol. Survey Open-file 
Report No. 85-711, scale 1:24,000.	(200) R29o no.85-711	stack 3
OF88-752 Ñ McLaughlin, R.J., Clark, J.C., and Brabb, E.E., 1988, Geologic map 
and structure sections of the Loma Prieta 7.5-minute quadrangle, Santa Clara and 
Santa Cruz Counties, California: U.S. Geol. Survey Open-file Report No. 88-752, 
32 p., map scale 1:24,000.		(200) R29o no.88-752	stack 3
OF89-676 Ñ Clark, J.C., Brabb, E.E., and McLaughlin, R.J., 1989, Geologic map 
and structure sections of the Laurel 7.5-minute quadrangle, Santa Clara and 
Santa Cruz Counties, California: U.S. Geol. Survey Open-file Report No. 89-676, 
30 p., map scale 1:24,000.	(200) R29o no.89-676	stack 3
OF91-593 Ñ McLaughlin, R.J., Clark, J.C., Brabb, E.E., and Helley, E.J., 1991, 
Geologic map and structure sections of the Los Gatos 7.5-minute quadrangle, 
Santa Clara and Santa Cruz Counties, California: U.S. Geol. Survey Open-file 
Report No. 91-593, map scale 1:24,000.	(200) R29o no.91-593		stack 3
OFR72-21 Ñ Rogers, T.H., and Armstrong, C.F., 1971, Surficial geologic maps, in 
Environmental geologic analysis of the Santa Cruz Mountains study area, Santa 
Clara County, California: Calif. Div. Mines and Geology, Open-file Report 72-21, 
101 p., plates IIA and IIB, map scale 1:12,000.		(276) C4ofr no.72-21
	stack 5
OFR72-22 Ñ Rice, S.J., and Strand, R.G., 1971, Geology, in Geologic and slope 
stability maps of the Tennessee Valley, Lucas Valley, and North Coastal areas, 
Marin County, California: Calif. Div. Mines and Geology, Open-file Report 72-22, 
plates II (T.V. area), III (N.C. area), and VI (L.V. area), map scale 1:12,000.   
[see also separate report (no landslide maps), Geology and Slope Stability in 
Marin County, a pilot study of three areas: CDMG, OFR 72-22, 17 p.]	M(276)2 
C4gt (maps only)		flat file 13;		also 203.3(276) R367r (report 
only)	stack 10
OFR72-25 Ñ Huffman, M.E., 1971, Landslides and related deposits, in Geology for 
planning in the Sonoma Mountain and Mark West-Riebli Road areas, Sonoma County, 
California: Calif. Div. Mines and Geology, Open-file Report 72-25, plate 6 (S.M. 
area) and Fig. 6 (M.W.-R. area), map scale 1:24,000.	(276) C4ofr no.72-25
	stack 5
OFR76-02 Ñ Rice, S.J., Smith, T.C., and Strand, R.G., 1976, Geology, in Geology 
for planning, central and southeastern Marin County, California: Calif. Div. 
Mines and Geology, Open-file Report 76-2, 103 p.; plates 1A (San Geronimo 
Valley), 1B (upper Ross Valley & W. San Rafael), 1C (E. San Rafael), 1D (lower 
Ross Valley, Corte Madera, Homestead Valley, Tamalpais Valley, Tennessee Valley, 
& adj.), and 1E (Tiburon Pen., Sausalito, & adj.), map scale 1:12,000.   [text 
and maps shelved separatey]		(276) C4ofr no. 76-2 (report & maps)
	stack 5; 	also M(276)2 M338s (maps only) 	flat file 13
OFR77-13 Ñ Armstrong, C.F., and Wagner, D.L., 1977, Landslides and slope 
stability, in Environmental geologic analysis of the Porter Creek study area, 
Sonoma County, California: Calif. Div. Mines and Geology, Open-file Report 77-
13SF, 38 p., plate 2, map scale 1:24,000.			(276) C4ofr no. 77-13SF
	stack 5
OFR77-15 Ñ Wagner, D.L., 1977, Geology, in Geology for planning in western Marin 
County, California: Calif. Div. Mines and Geology, Open-file Report 77-15SF, 
plates 1 and 2, map scale 1:12,000.		(276) C4ofr no. 77-15SF		stack 5
OFR78-11 Ñ Armstrong, C.F., and Wagner, D.L., 1976, Landslides and slope 
stability, in Environmental geologic analysis of the Diablo Range study area, 
southern Santa Clara County, California: Calif. Div. Mines and Geology, Open-
file Report 76-11SF, 43 p. plus appendices, plate 2, map scale 1:12,000.   
[report and maps shelved separately]	(276) C4ofr no. 78-11SF	stack 5
OFR78-12 Ñ Wagner, D.L., 1976, Geology, in Environmental geologic analysis of 
the Diablo Range study area II, southern Santa Clara County, California: Calif. 
Div. Mines and Geology, Open-file Report 78-12SF, 36 p. plus appendices, plate 
1, map scale 1:12,000.   [report and maps shelved separately]	(276) C4ofr 
no. 78-12SF		stack 5
OFR79-15 Ñ Armstrong, C.F., 1979, Geologic hazards, in Environmental geologic 
analysis of the Chalk Hill Road study area, Sonoma County, California: Calif. 
Div. Mines and Geology, Open-file Report 79-15, 16 p., plate 2, map scale 
1:24,000.		(276) C4ofr no. 79-15SF	stack 5
OFR80-11 Ñ Armstrong, C.F., 1980, Geology, Landslides and slope stability, in 
Environmental geologic analysis of the Tar Creek South study area, Santa Clara 
County, California: Calif. Div. Mines and Geology, Open-file Report 80-11, 20 
p., plates 1 and 2, map scale 1:12,000.	(276) C4ofr no. 80-11SF	stack 5
OFR81-12 Ñ Bedrossian, T.L., 1981, Geology, in Landslides and slope stability of 
the West Sebastopol study area: Calif. Div. Mines and Geology, Open-file Report 
81-12SF, 41 p., plate 1, map scale 1:24,000.		(276) C4ofr no.81-12SF	
	stack 5
OFR84-06 Ñ McJunkin, R.D., 1983, Landslides, in Geology of the Big Basin 
Redwoods State Park, Santa Cruz County, California: Calif. Div. Mines and 
Geology, Open-file Report 84-6SAC, 72 p., plate 3, map scale 1:24,000.	(276) 
C4ofr no. 84-6SAC		stack 5
OFR84-22 Ñ Davenport, C.W., 1984, An analysis of slope failure in eastern Marin 
County, California, resulting from the January 3rd and 4th, 1982 storm: Calif. 
Div. Mines and Geology, Open-file Report 84-22SF, 38 p., map scale 1:62,500.
	(276) C4ofr no. 84-22SF		stack 5
OFR86-05 Ñ Smith, T.C., 1986, Landslides and related features, in Landslides in 
the southeastern part of the Petaluma Dairy Belt, Sonoma County, California: 
Calif. Div. Mines and Geology, Open-file Report 86-5SF, plate B, map scale 
1:12,000.	(276) C4ofr no. 86-5SF		stack 5
OFR86-07 Ñ Davenport, C.W., 1986, Landslides and related features, in Landslide 
hazards in parts of the Diablo and Dublin 7.5-minute quadrangles, Contra Costa  
County, California: Calif. Div. Mines and Geology, Open-file Report 86-7SF, 
plate B, map scale 1:24,000.	(276) C4ofr no. 86-7SF	stack 5
OFR86-17 Ñ Bortugno, E.J., 1987, Landslides and related features, in Landslide 
hazards in the Benicia-Vallejo area, Solano County, California: Calif. Div. 
Mines and Geology, Open-file Report 86-17SF, plate B, map scale 1:24,000.	
	(276) C4ofr no. 86-17SF			stack 5
OFR87-09 Ñ Majmundar, H.H., 1987, Landslides and related features, in Landslide 
hazards in the south half of the Fairfield North quadrangle, Solano County, 
California: Calif. Div. Mines and Geology, Open-file Report 87-9SF, plate B, map 
scale 1:24,000.	(276) C4ofr no. 87-9SF	stack 5
OFR88-05 Ñ Jennings, C.W., 1988, Preliminary geologic map of the NW 1/4 Santa 
Rosa 7-1/2 minute quadrangle, Sonoma County, California: Calif. Div. Mines and 
Geology, Open-file Report 88-5, map scale 1:12,000.		(276) C4ofr no. 88-5
	stack 5
OFR88-22Ñ Manson, M.W., 1988, Landslides and related features, in Landslide 
hazards in the Cordelia-Vallejo area, Solano and Napa Counties, California: 
Calif. Div. Mines and Geology, Open-file Report 88-22, plate B, map scale 
1:24,000.		(276) C4ofr no. 88-22	stack 5
OFR89-17 Ñ Majmundar, H.H., 1989, Landslides and related features, in Landslide 
hazards in the Vacaville area, Solano County, California: Calif. Div. Mines and 
Geology, Open-file Report 89-17, plate B, map scale 1:24,000.		(276) 
C4ofr no. 89-17	stack 5
OFR90-06 Ñ Spittler, T.E., and Harp, E.L., 1990, Preliminary map of landslide 
features and coseismic fissures in the Summit Road area of the Santa Cruz 
Mountains triggered by the Loma Prieta earthquake of October 17, 1989: Calif. 
Div. Mines and Geology, Open-file Report 90-6, 3 plates, map scale 1:4800.	
	(276) C4ofr no. 90-6	stack 5
OFR91-02 Ñ Majmundar, H.H., 1991, Landslides and related features, in Landslide 
hazards in Livermore Valley and vicinity, Alameda and Contra Costa Counties, 
California: Calif. Div. Mines and Geology, Open-file Report 91-2, plates B1 and 
B2, map scale 1:24,000.	(276) C4ofr no. 91-2		CA Center (rm. M2240)
OFR91-05 Ñ Manson, M.W., Keefer, D.K., and McKittrick, M.A., 1992, Landslides 
and other geologic features in the Santa Cruz Mountains, California, resulting 
from the Loma Prieta Earthquake of October 17, 1989: Calif. Div. Mines and 
Geology, Open-file Report 91-05, 45 p., 15 plates, map scale 1:48,000.	(276) 
C4ofr no. 91-5	stack 5
OFR92-05 Ñ Majmundar, H.H., 1991, Landslides and related features, in Landslide 
hazards in the Tassajara and Byron Hot Springs 7.5' quadrangles, Alameda and 
Contra Costa Counties, California: Calif. Div. Mines and Geology, Open-file 
Report 92-5, plate B, map scale 1:24,000.	(276) C4ofr no. 92-5	stack 5
OFR93-01 Ñ Rogers, T.H., 1993, Geology and landslides, in Geology of the 
Hollister and San Felipe quadrangles, San Benito, Santa Clara, and Monterey 
Counties, Open-file Report 93-01, plate 3, map scale 1:24,000.	(276) C4ofr 
no. 93-01	stack 5
OFR94-02 Ñ Majmundar, H.H., 1994, Landslides and related features, in Landslide 
hazards in the Hollister area, San Benito County, California: Calif. Div. Mines 
and Geology, Open-file Report 94-2, plate B, map scale 1:24,000.	 (276) C4ofr 
no. 94-2	stack 5
OFR95-12 Ñ Haydon, W.D., 1995, Landslides and related slope-failure features, in 
Landslide hazards in the Martinez-Walnut Creek area, Contra Costa County, 
California: Calif. Div. Mines and Geology, Open-file Report 95-12, plate B, map 
scale 1:24,000.	(276) C4ofr no. 95-12	stack 5
OFR95-14 Ñ Majmundar, H.H., 1996, Landslides and related features, in Landslide 
hazards in the Hayward quadrangle and parts of the Dublin quadrangle, Alameda 
and Contra Costa Counties, California: Calif. Div. Mines and Geology, Open-file 
Report 95-14, plate B, map scale 1:24,000.	(276) C4ofr no. 95-14	stack 5
OFR95-15 Ñ Majmundar, H.H., 1996, Landslides and related features, in Landslide 
hazards in the Las Trampas Ridge quadrangle and parts of the Diablo quadrangle, 
Alameda and Contra Costa Counties, California: Calif. Div. Mines and Geology, 
Open-file Report 95-15, plate B, map scale 1:24,000.	(276) C4ofr no. 95-15
	stack 5
OFR95-16 Ñ Majmundar, H.H., 1997?, Landslides and related features, in Landslide 
hazards in the Napa quadrangle, Napa County, California: Calif. Div. Mines and 
Geology, Open-file Report 95-16, map scale 1:24,000.		in-press; not yet 
released
OFR9x-xx Ñ Majmundar, H.H., 1997?, Landslides and related features, in Landslide 
hazards in the Newark, Niles and La Costa Valley quadrangles, Alameda County, 
California: Calif. Div. Mines and Geology, Open-file Report 95x-xx, map scale 
1:24,000.		in-press; not yet released
PP782 Ñ Schlocker, Julius, 1974, Map showing areas of exposed bedrock, contours 
on bedrock surface, and landslides in the San Francisco North quadrangle, San 
Francisco and Marin counties, California, plate 3 in Geology of the San 
Francisco North quadrangle, California: U.S. Geol. Survey Professional Paper 
782, 109 p.; map scale, 1:24,000.				(200) qB no.782	
	stack 2
PP1264 Ñ Turnbull, R.W., 1983, Map showing earth-flow complexes in Eden Canyon 
and vicinity, Alameda County, California, plate 1, in Keefer, D.K., and Johnson, 
A.M., Earth flowsÑmorphology, mobilization, and movement: U.S. Geological Survey 
Professional Paper 1264, map scale 1:6000.		(200) qB no.1264	
	stack 2
PP1434 Ñ Ellen. S.D., Cannon, S.H., and Reneau, S.L., 1988, Distribution of 
debris flows in Marin County, plate 6, in Ellen, S.D., and Wieczorek, G.F., 
eds., Landslides, floods and marine effects of the storm of January 3-5, 1982, 
in the San Francisco Bay region, California: U.S. Geological Survey Professional 
Paper 1434, map scale 1:62,500.	(200) qB no.1434	stack 2
PR16 Ñ Huffman, M.F., 1972, Surficial geology, in Geology for planning on the 
Sonoma coast between the Russian and Gualala Rivers: Calif. Div. Mines and 
Geology, Preliminary Report 16, 38 p., plate 3, map scale 1:24,000.	(276) 
C4p7 no.16		stack 5
PR17 Ñ Rogers, T.H., and Armstrong, C.F., 1973, Surficial geology map, in 
Environmental geologic analysis of the Monte Bello Ridge Mountain study area, 
Santa Clara County, California: Calif. Div. Mines and Geology, Preliminary 
Report 17, 45 p., plate 2, map scale 1:12,000.   [report and maps may be shelved 
together, but as separate documents]	(276) C4p7 no.17	stack 5
PR18 Ñ Williams, J.W., Armstrong, C.F., Hart, E.W., and Rogers, T.H., 1973, 
Areal geology, in Environmental geological analysis of the south county study 
area, Santa Clara County, California: Calif. Div. Mines and Geology, Preliminary 
Report 18, 41 p., plate 1, map scale 1:24,000.		(276) C4p7 no.18	
	stack 5
PR19 Ñ Knox, R.D., and Bishop, C.C., 1973, Landslide map, in Geological and 
geophysical investigations for Tri-Cities seismic safety and environmental 
resources study: Calif. Div. Mines and Geology, Preliminary Report 19, 44 p., 
plate 6, map scale 1:24,000.	(276) C4p7 no.19	stack 5
PR20 Ñ Huffman, M.F., 1973, Surficial geology, in Geology for planning on the 
Sonoma coast between the Russian River and Estero Americano: Calif. Div. Mines 
and Geology, Preliminary Report 20, 36 p., plate 3, map scale 1:24,000.	(276) 
C4p7 no.20		stack 5
PR21 Ñ Rice, S.J., 1973, Geology, in Rice, S.J., (with Chase, G.B.), Geology and 
geologic hazards of the Novato area, Marin County, California: Calif. Div. Mines 
and Geology, Preliminary Report 21, 47 p., plate 1, map scale 1:12,000.	
	(276) C4p7 no.21		stack 5
SR120 Ñ Huffman, M.E., and Armstrong, C.F., 1980, Landslides and relative slope 
stability, in Geology for planning in Sonoma County: Calif. Div. Mines and 
Geology, Special Report 120, 31 p., plates 2A and 2B, map scale1:62,500.
	(276) qC4sp no.120	stack 5
SR122 Ñ McLaughlin, 1974, R.J., Preliminary geologic map of The Geysers steam 
field and vicinity, in Bacon, C.F., Amimoto, P.Y., Sherburne, R.W., and Slosson, 
J.E., T.L., 1976, Engineering geology of The Geysers geothermal resource area, 
Lake, Mendocino, and Sonoma Counties, California: Calif. Div. Mines and Geology, 
Special Report 122, 35 p., Appendix 1, map scale 1:24,000.		(276) qC4sp 
no.122	stack 5
SR142 Ñ McLaughlin, R.J., 1974, Preliminary geologic map of The Geysers steam 
field and vicinity, Sonoma County, showing locations of landslides, earthquake 
epicenters, and mines, in Bedrossian, T.L., 1980, Geology and slope stability in 
selected parts of The Geysers geothermal resources area: Calif. Div. Mines and 
Geology, Special Report 142, 65 p., plate 1A, map scale 1:24,000.		(276) 
qC4sp no.142	stack 5
W Ñ Dickinson, W.R., Cummings, J.C., and Wm. Cotton and Associates, undated (ca. 
1992), Geologic map: Town of Woodside, San Mateo County, California, scale 
1:7200.		M(276)2 W861d	flat file 13
PV Ñ Cummings, Jon, and Wm. Spangle & Associates, compilers of mapping by J.D. 
Rodine, C. Price, and others,1975, Geologic map: Town of Portola Valley, San 
Mateo County, California, scale 1:6000.		not yet in library ----need to 
check this
ÑÑÑÑÑÑÑÑÑÑÑ

[BDC] = "Basic Data Contribution" (of the San Francisco Bay Region Environment 
and Resources Planning Study) Ñ duplicate of landslide map published in another 
series Ñ shelved in both stack 4 and the California Center of the Menlo Park 
USGS library


1 Sonoma, Napa, Solano, Marin, Contra Costa, San Francisco, San Mateo, Alameda, 
Santa Clara, and Santa Cruz
2  Landslides have not yet been mapped in detail in all parts of the following 
five 7.5' quadrangles: Valley Ford and Two Rock in northern Marin Co., and 
Mindego Hill, Santa Teresa Hills and Mt Madonna in western Santa Clara Co.