U. S. DEPARTMENT OF THE INTERIOR

U. S. GEOLOGICAL SURVEY

PRELIMINARY GEOLOGIC MAP OF THE NEWBURY PARK

7.5' QUADRANGLE, SOUTHERN CALIFORNIA:

A DIGITAL DATABASE

Compiled by R. F. Yerkes1 and R. H. Campbell2

Open - File Report 97-459

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 "Preliminary Geologic Map of the Newbury Park 7.5' Quadrangle, southern

California: A Digital Database," has been approved for release and publication by the Director of the

USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the

right to revise the data pursuant to further analysis and review. This database is released on condition that

neither the USGS nor the U. S. Government may be held liable for any damages resulting from its use.

1997

1 Menlo Park, CA 94025

2

 Reston, VA 20192
2

INTRODUCTION

This Open-File report is a digital geologic map database. This pamphlet serves to introduce

and describe the digital data. There is no paper map included in the Open-File report.

This digital map database is compiled from previously published sources combined with

some new mapping and modifications in nomenclature. The geologic map database

delineates map units that are identified by general age and lithology following the

stratigraphic nomenclature of the U. S. Geological Survey. For detailed descriptions of the

units, their stratigraphic relations, sources of geologic mapping, and data on exploratory

wells consult Yerkes and Campbell (1997), and Yerkes and Showalter (1990). More

specific information about the units may be available in the original sources.

The content and character of the database and methods of obtaining it are described herein.

The geologic map database itself, consisting of four ARC coverages and one base layer,

can be obtained over the Internet or by magnetic tape copy as described below. The

processes of extracting the geologic map database from the tar file, and importing the ARC

export coverages (procedure described herein), will result in the creation of an ARC

workspace (directory) called 'newbry.'

The database was compiled using ARC/INFO, a commercial Geographic Information

System (Environmental Systems Research Institute, Redlands, California), with version

3.0 of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991, Fitzgibbon,

1991, Wentworth and Fitzgibbon, 1991). It is stored in uncompressed ARC export format

(ARC/INFO version 7.x) in a compressed UNIX tar (tape archive) file. The tar file was

compressed with gzip, and may be uncompressed with gzip, which is available free of

charge via the Internet from the gzip Home Page (http://w3.teaser.fr/~jlgailly/gzip). A tar

utility is required to extract the database from the tar file. This utility is included in most

UNIX systems, and can be obtained free of charge via the Internet from Internet

Literacy's Common Internet File Formats Webpage

(http://www.matisse.net/files/formats.html). ARC/INFO export files (files with the .e00

extension) can be converted into ARC/INFO coverages in ARC/INFO (see below) and can

be read by some other Geographic Information Systems, such as MapInfo via ArcLink and

ESRI's ArcView (version 1.0 for Windows 3.1 to 3.11 is available for free from ESRI's

web site: http://www.esri.com).

OBTAINING THE DIGITAL DATA

The digital database package can be obtained in any of three ways:

1. Sending a tape with request

A 20 MB compressed tar file of the geologic map database and related files can be obtained

by sending a tape with request and return address to:

Newbury Park, CA 7.5' Geologic Database

c/o Database Coordinator

U.S. Geological Survey

345 Middlefield Road, M/S 975

Menlo Park, CA 94025
3

The compressed tar file will be returned on the tape. The acceptable tape types are:

1/4 inch, 150 MB cartridge tape

2.3 or 5.0 GB, 8mm Exabyte tape.

2. Anonymous ftp over the Internet

To obtain the tar file by anonymous ftp do the following:

cd local_directory • go to a directory to receive the tar 

file

ftp wrgis.wr.usgs.gov • make ftp connection with the USGS

computer WRGIS

Name: anonymous • use “anonymous” as your user name

Password: your email address • use your email address as a 

password

cd pub/geologic • go down to the pub/geologic 

directory

cd ca/of97-459 • go down to the open file directory

type binary • change transfer type to binary

get newbry.tar.gz • copy the compressed tar file across 

Internet to the receiving directory

quit • close the ftp connection

3. From the Western Region Geologic Information Web Page.

To obtain the tar file via the World Wide Web:

The U.S. Geological Survey now supports a set of graphical pages on the World Wide

Web. Digital geologic publications (including this one) can be accessed via these pages.

The web page for digital geologic publications from the Western Region (including this

one) is “http://wrgis.wr.usgs.gov”. Once at the main page, click on 'Geologic Map

Databases' under the heading 'Data Online'; next click on 'California.' Scroll down

to get to the listing for this database. Set your web browser to save to a local disk and click

on the link labeled 'newbry.tar.gz' to download the compressed tar file that contains the

Newbury Park geologic map database.
4

EXTRACTING THE GEOLOGIC MAP DATABASE FROM THE TAR FILE

If you obtained the database package on tape:

put the tape in your tape drive

cd local_directory -go to a directory to receive the

tar file

tar xvfb /dev/rstn 20 -/dev/rstn is the tape device with

 n an integer, this puts the tar file

in local_directory; 20 is the block

size of the tar file

gzip -d newbry.tar.gz -makes a 80 MB uncompressed

tar file newbry.tar

cd local_directory2 -go to the directory that will hold

the directory newbry (if different

from local_directory)

tar xvfb {path to tar

file}/newbry.tar 20 -extract the newbry directory from

 the tar file; 20 is the block size of

the tar file.

If you obtained the database package by anonymous ftp or from the web page:

gzip -d newbry.tar.gz -makes a 80 MB uncompressed

tar file newbry.tar

cd local_directory2 -go to the directory that will hold

the directory newbry (if different

from local_directory)

tar xvfb {path to tar

file}/newbry.tar 20 -extract the newbry directory from

the tar file.

Each of the processes described above will create a directory "newbry" that contains the

ARC export files and supporting files as described below. The directory structure at this

point will look like this:

newbry/

nb-geol.e00

nb-strc.e00

nb-wells.e00

nb-foss.e00

nb-topo.e00

newbry.ps

newbry.txt

import.aml

GEOLOGIC MAP DATABASE CONTENTS

The geologic map database consists of four separate layers and one base layer. Each of

these layers (coverages) has been converted to uncompressed ARC/INFO export files. The

ARC export files and the associated ARC/INFO coverages, as well as the additional digital

material included in the database package, are described below:
5

ARC/INFO Resultant Description of Coverage

export file Coverage

-------------- ------------ -----------------------------

nb-geol.e00 nb-geol Depositional contacts, faults, and unit labels

nb-strc.e00 nb-strc Fold axes, strike and dip information

nb-wells.e00 nb-wells Exploratory oil wells; supporting data given 

in Yerkes and Campbell (1997), and Yerkes 

and Showalter (1990).

nb-foss.e00 nb-foss Fossil localities; supporting data given in

Yerkes and Campbell (1997).

nb-topo.e00 nb-topo Topographic base map taken from a scan of

a composite negative of the Newbury Park

7.5 minute quadrangle (contour interval = 20

ft.)

ASCII text files and PostScript plot files:

newbry.ps This file.

newbry.txt A text-only file containing an unformatted version of newbry.ps

import.aml ASCII text file in ARC Macro Language to convert these ARC 

export files to ARC coverages in ARC/INFO.

The following directory is produced in the process of converting the export files into ARC

coverages:

info/ INFO directory containing the database files that accompany each

ARC/INFO layer (coverage).

Once the ARC export coverages have been imported (see discussion below), the Newbury

Park (newbry) directory, or ARC workspace, will look like this:

newbry/

info/

nb-geol/

nb-strc/

nb-wells/

nb-foss/

nb-topo/

newbry.ps

newbry.txt

import.aml
6

CONVERTING ARC EXPORT FILES

ARC export files are converted to ARC coverages using the ARC command IMPORT with

the option COVER. In order to ease conversion and to maintain naming conventions, we

have included an ASCII text file in ARC Macro Language that will convert all of the export

files in the database into coverages and create the associated INFO directory. Change

directories to the newbry/ directory. From the ARC command line type:

Arc: &run import.aml

ARC export files can also be read by some other Geographic Information Systems. Please

consult your GIS documentation to see if you can use ARC export files and the procedure

to import them.

DIGITAL COMPILATION

The geologic map information was digitized from stable originals of the geologic maps at

1:24,000 scale. The author manuscripts (pencil on mylar) were scanned using a

monochrome scanner with a resolution of 800 dots per inch. The scanned images were

vectorized and transformed from scanner coordinates to projection coordinates with digital

tics placed by hand at quadrangle corners. The scanned lines were edited interactively by

hand using graphical user interface ALACARTE (Fitzgibbon, 1991, Fitzgibbon and

Wentworth, 1991, Wentworth and Fitzgibbon, 1991). Scanning artifacts significant for

display at a scale of 1:24,000 were corrected.

BASE MAPS

The base map layer (nb-topo) was prepared by scanning a scale-stable composite negative

of the Newbury Park 7.5 minute topographic map (1967 edition). The negative was

scanned using a monochrome scanner with a resolution of 400 dots per inch. The raster

scan was converted to a GRID in ARC/INFO. The GRID was then vectorized and

reprojected into State Plane Projection using the four corner tics as reference points. The

arcs in the base layer have not been attributed. The base map is provided for reference

only.

SPATIAL RESOLUTION

Uses of this digital geologic map should not violate the spatial resolution of the data.

Although the digital form of the data removes the constraint imposed by the scale of a paper

map, the detail and accuracy inherent in map scale are also present in the digital data. The

fact that this database was edited at a scale of 1:24,000 means that higher resolution

information is not present in the dataset. Plotting at scales larger than 1:24,000 will not

yield greater real detail, although it may reveal fine-scale irregularities below the intended

resolution of the database. Similarly, where this database is used in combination with other

data of higher resolution, the resolution of the combined output will be limited by the lower

resolution of these data.
7

FAULTS AND LANDSLIDES

This database is not sufficiently detailed or comprehensive to identify or characterize sitespecific hazards represented by faults or landslides shown; the faults shown do not take

the place of fault-rupture hazard zones designated by the California State Geologist (see

Hart, 1988).

DATABASE SPECIFICS

The map databases consist of ARC coverages which are stored in State Plane (California

coordinate system) projection (Table 1). Digital tics define a 2.5 minute grid of latitude and

longitude in the geologic coverages corresponding with quadrangle corners and internal

tics. In the base map layer, the tics define a 7.5 minute grid, corresponding with

quadrangle corners.

Table 1 - Map Projection

The map is stored in State Plane projection

PROJECTION STATE PLANE

UNITS METERS -on the ground

ZONE 3426 -Arc/Info State Plane zone

 corresponding to California

 coordinate system zone 7

DATUM NAD27

PARAMETERS -none

The content of the geologic database can be described in terms of the lines and the areas that

compose 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

LINES

The lines (arcs) are recorded as strings of vectors and are described in the arc attribute table

(Table 3). They define the boundaries of the map units, the boundaries of open bodies of

water, and the map boundaries. These distinctions, including the geologic identities of the

unit boundaries, are recorded in the LTYPE field according to the line types listed in Tables

4 and 5.
8

Table 3 - Content of the Arc Attribute Tables (NB-GEOL.AAT, NB-STRC.AAT)

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

<coverage># 4 5 B unique internal 

control number

<coverage>-ID 4 5 B unique identification 

number

LTYPE 35 35 C line type (see Tables 

4 and 5)

SEL 1 1 I user defined field used

to save a selected set

SYMB 3 3 I user defined field used

to save symbol

assignments (such

 as color) 

Table 4 - Line Types Recorded in the LTYPE Field (NB-GEOL)

contact, certain

contact, approx. located

contact, inferred

fault, approx. located

fault, concealed

fault, certain

fault, inferred, queried

map boundary, certain

Table 5 - Line Types Recorded in the LTYPE Field (NB-STRC)

f.a., anticline, approx. located

f.a., anticline, concealed

f.a., syncline, approx. located

f.a., syncline, concealed

AREAS

Map units (polygons) are described in the polygon attribute table (Table 6) The identities of

the map units from compilation sources are recorded in the PTYPE field by map label

(Table 7). For a full description of the map units see Yerkes and Campbell (1997).
9

Table 6 - Content of the Polygon Attribute Tables (NB-GEOL.PAT)

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 perimeter in meters

<coverage># 4 5 B unique internal control

number

<coverage>-ID 4 5 B unique identification number

PTYPE 35 35 C unit label (see Table 7)

SEL 1 1 I user defined field used to save

a selected set

SYMB 3 3 I user defined field used to save

symbol assignments (such as

color)

Table 7 - Map Units (NB-GEOL)

QTs Qsc Ts

Qal Qt Ttc

Qao Tco Ttcus

Qco Tcoa Tv

Qfp Tcob

Qls Ti

Qsc Tm

POINTS

Point information (strikes and dips, well localities, fossil localities) is recorded as

coordinate and related information and is described in the Point Attribute Table (Tables 8

and 10).

Table 8 - Content of the Point Attribute Tables (NB-STRC.PAT)

ITEM NAME WIDTH OUTPUT TYPE N. DEC

AREA 4 12 F 3 not used

PERIMETER 4 12 F 3 not used

<coverage># 4 5 B unique internal control

number

<coverage>-ID 4 5 B unique identification number

PTTYPE 35 35 C point type (see Table 9)

DIP 3 3 I dip angle in degrees

STRIKE 3 3 I strike angle in degrees

SEL 1 1 I user defined field used to

save a selected set

SYMB 3 3 I user defined field used to

save symbol assignments

(such as color)
1 0

Table 9 - Point Types (NB-STRC)

Bedding

Table 10 - Content of the Point Attribute Tables (NB-WELLS.PAT, NB-FOSS.PAT)

ITEM NAME WIDTH OUTPUT TYPE N. DEC

AREA 4 12 F 3 not used

PERIMETER 4 12 F 3 not used

<coverage># 4 5 B unique internal control 

number

<coverage>-ID 4 5 B unique identification

number

PTTYPE 35 35 C point type

SAMNO 35 35 C sample number

SEL 1 1 I user defined field used

to save a selected set

SYMB 3 3 I user defined field used to

save symbol assignments

(such as color)

ACKNOWLEDGMENTS

R. H. Campbell, Reston, VA assisted in field interpretations and compilation; P. K.

Showalter and C. M. Wentworth supplied critical custom programming; and S. E. Graham

updated supporting files for completeness and consistency and prepared this report.
1 1

REFERENCES

Fitzgibbon, T.T., 1991, ALACARTE installation and system manual (version 1.0): U.S.

Geological Survey, Open-File Report 91-587B.

Fitzgibbon, T.T., and Wentworth, C.M., 1991, ALACARTE user interface - AML code 

and demonstration maps (version 1.0): U.S. Geological Survey, Open-File Report

91-587A.

Hart, E.W., 1988, Fault-rupture hazard zones in California; Alquist-Priolo Special Studies

Zones Act of 1972 with index to special studies zones maps: California Division of

Mines and Geology Special Publication 42.

Wentworth, C. M., and Fitzgibbon, T. T., 1991, ALACARTE user manual (version 1.0):

U. S. Geological Survey Open-File Report 91-587C.

Yerkes, R. F., and Campbell, R. H., 1997, Preliminary geologic map of the Newbury 

Park 7.5' quadrangle, southern California: U. S. Geological Survey Open-File 

Report 97-428.

Yerkes, R. F., and Showalter, P. K., 1990, Exploratory wells drilled in the Los Angeles, 

California 1:100,000 quadrangle, southern California: U. S. Geological Survey 

Open-File Report 90-627.