Geologic map and database of the Salem East and Turner 7.5 minute
quadrangles, Marion County, Oregon:

A digital database

 

 

 

By

Terry L. Tolan^1^ and Marvin H. Beeson^2^

Digital Database

By

Christopher B. DuRoss^3^

 

::: Definition-Term
 
:::

::: Definition-Term
Open - File Report 00-351
:::

 ![](media/image1.emf)

  

^1^Geosciences Group, Westinghouse Hanford Company, P.O. Box 1970,
Richland, Washington 99352

^2^Geology Department, Portland State University, P.O. Box 751,
Portland, Oregon 97207

^3^U.S. Geological Survey, 345 Middlefield Rd. MS-975, Menlo Park, CA
94025

 U.S. Department of the Interior

Bruce Babbitt, Secretary

 

**U.S. Geological Survey**

Charles Groat, Director

 

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 \"Geologic map and database of

the Salem East and Turner 7.5 minute quadrangles, Marion

County, Oregon

A Digital Database\" 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.

 

 

**To obtain this pamphlet, contact:**

**USGS Information Services**

**Box 25286**

**Denver Federal Center**

**Denver, CO 80225**

**303-202-4700**

**303-202-4693 FAX**

2000

U.S. Department of the Interior

U.S. Geological Survey

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. The report does include, however,
PostScript plot files containing images of two geologic map sheets with
explanation, as well as the accompanying text describing the geology of
the area. For those only interested in a paper plot of information
contained in the database or in obtaining the PostScript plot files,
please see the section entitled \"For Those Who Don\'t Use Digital
Geologic Map Databases\" below.

This digital map database, compiled from previously published and
unpublished data, and new mapping by the authors, represents the general
distribution of bedrock and surficial deposits of the Salem East and
Turner 7.5 minute quadrangles. A previously published adjacent geologic
map and database (OF99-141) by Tolan, Beeson, and Wheeler (1999)
contains a text file (geol.pdf, geol.txt or geol.ps), which provides
current information on the geologic structure and stratigraphy of the
area covered. Open File Report 99-141 may be found on the web at:

http://wrgis.wr.usgs.gov/open-file/of99-141

The database delineates map units that are identified by general age and
lithology following the stratigraphic nomenclature of the U.S.
Geological Survey. The scale of the source maps limits the spatial
resolution (scale) of the database to 1:24,000 or smaller. The content
and character of the database, as well as three methods of obtaining the
database, are described below.

 

**For those who don\'t use digital geologic map databases** 

For those interested in the geology of the northwestern Oregon region of
the Salem East and Turner 7.5 minute quadrangles who do not use an
ARC/INFO compatible Geographic Information System (GIS), we have
provided two sets of plot files containing images of much of the
information in the database. There is a set of images in PostScript
format and another in Adobe Acrobat PDF format (see the sections
"PostScript plot files" and "PDF plot files" below).

Those interested who have computer capability can access the plot file
packages in any of the three ways described below (see the section
\"Obtaining the digital database and plot file packages\"). However, it
should be noted the plot file packages do require gzip and tar utilities
to access the plot files. Therefore additional software, available free
on the Internet, may be required to use the plot files (see section
\"Tar files\").

Those without computer capability can obtain plots of the map files
through USGS plot-on-demand service for digital geologic maps (see
section \"Obtaining plots from USGS Open-File Services\") or from an
outside vendor (see section \"Obtaining plots from an outside vendor\").

 

**Digital Open-File contents**

This Open-File report consists of three digital packages. The first is
the **PostScript Plotfile Package**, which consists of PostScript plot
files of a geologic map with explanation (Sheets 1-2), as well as a
PostScript version of a geologic description pamphlet, figures, and
tables. The second is the **PDF Plotfile Package**, and contains the
same plotfiles as the first package, but in Portable Document Format
(PDF). The third is **the Digital Database - metadata Package**, and
contains the geologic map database itself, and the supporting data,
including base maps, map explanation, geologic description, and
references.

 

**PostScript plot file package**

This package contains the images described here in PostScript format
(see below for more information on PostScript plot files):

slm.ps A PostScript plottable file containing an image of the geologic
map, base map, cross sections, correlation of map units, description of
map units and references of the Salem East 7.5 minute quadrangle at a
scale of 1:24,000 (Sheet 1).

tnr.ps A PostScript plottable file containing an image of the geologic
map, base map, cross sections, correlation of map units, description of
map units and references of the Turner 7.5 minute quadrangle at a scale
of 1:24,000 (Sheet 2).

readme.ps A PostScript plottable file of this document

PDF plotfile package

This package contains the images described here in PDF format (see below
for more information on PDF plot files):

slm.pdf A PDF containing an image of the geologic map, base map, cross
sections, correlation of map units, description of map units and
references of the Salem East 7.5 minute quadrangle at a scale of
1:24,000 (Sheet 1).

tnr.pdf A PDF containing an image of the geologic map, base map, cross
sections, correlation of map units, description of map units and
references of the Turner 7.5 minute quadrangle at a scale of 1:24,000
(Sheet 2).

readme.pdf A PDF of this document

Digital database - metadata package

The database package includes geologic map database files for the Salem
East and Turner 7.5 minute quadrangles. The digital maps, or coverages,
along with their associated INFO directory have been converted to
uncompressed ARC/INFO export files. ARC export files promote ease of
data handling, and are usable by some Geographic Information Systems in
addition to ARC/INFO (see below for a discussion of working with export
files). Raster data are stored in ARC grid format rather than export
format to reduce file size. The ARC export files and associated ARC/INFO
coverages, grids, and directories, as well as the additional digital
material included in the database, are described below:

**ARC/INFO Resultant**

**export file Coverage Description of Coverage**

# Salem East quadrangle

slm_geo.e00 slm_geo Faults, depositional contacts, and rock units in the
quadrangle

slm_stx.e00 slm_stx Fold axis as arcs, cross section lines

# Turner quadrangle

tnr_geo.e00 trn_geo Faults, depositional contacts, and rock units in the
quadrangle

tnr_stx.e00 tnr_stx Geologic attitudes as points include pttype, strike,
dip fields,

dip values as annotation, fold axis as arcs, cross section lines

tnr_ann.e00 tnr_ann Unit label leaders

**ARC/INFO grids Description of Grid**

slm_grd Salem East color geology grid merged with grid of topographic
base

tnr_grd Turner color geology grid merged with grid of topographic base

The database package also includes the following files:

 ASCII text files, including explanatory text, PostScript plot files,
Encapsulated PostScript files from Adobe Illustrator 8 used as map
collars and Figures \-\-\-\-- (EPS and JPEG) for the geologic report,
ARC Macro Language files for plotting maps, custom ARC lineset and a ARC
Macro Language file for conversion of ARC export files into ARC
coverages:

metadata.txt The metadata

readme.txt This file

readme.ps This file as PostScript plot file

import.aml ASCII text file in ARC Macro Language to convert ARC export
files to ARC coverages in

ARC/INFO

slm_sh1.eps Encapsulated PostScript Adobe Illustrator 8 file (map
collar) for the Salem East 7.5 minute

quadrangle (Sheet 1)

tnr_sh2.eps Encapsulated PostScript Adobe Illustrator 8 file for Turner
7.5 minute quadrangle (Sheet 2)

slm.gra ARC Graphics Metafile for Salem East 7.5 minute quadrangle
(Sheet 1)

tnr.gra ARC Graphics Metafile for Turner 7.5 minute quadrangle (Sheet 2)

slm_plot.aml Plot AML generates uncompressed PostScript of Salem East
7.5 minute quadrangle at 600 dpi (Sheet 1)

tnr_plot.aml Plot AML generates uncompressed PostScript of Turner 7.5
minute quadrangle at 600 dpi (Sheet 2)

geol61.lin Custom ARC lineset

johanna.txt Custom ARC textset 

uncom_r Parameter file in svscplot.aml to uncompress and rotate
PostScript file 90 degrees

uncom Parameter file in stnplot.aml to uncompress PostScript file

fnt038 Arc/Info font used with markerset

fnt039 Arc/Info font used with markerset

slm.tab Arc/Info grid remap table for colors (Salem East quadrangle)

tnr.tab Arc/Info grid remap table for colors (Turner quadrangle)

info Arc/Info directory

log Arc/Info log file

alc1.shd Arc/Info shadeset (custom)

geologyk.mrk Arc/Info markerset (custom)

droid.lut Arc/Info marker look up table (internal) exported as
droid.lut.e00

slmpoly.lut Arc/Info line look up table for polygons (internal)

slmln.lut Arc/Info line look up table for lines and fold arcs (internal)

slmlm.lut Arc/Info line look up table for fold and fault markers
(internal)

tnrpoly.lut Arc/Info line look up table for polygons (internal)

tnrln.lut Arc/Info line look up table for lines and fold arcs(internal)

tnrlm.lut Arc/Info line look up table for fold and fault markers
(internal)

 The following supporting directory is not included in the database
package, but is produced in the process of reconverting the export files
into ARC coverages:

info/ INFO directory containing files supporting the databases.

**Tar files**

The two data packages described above are stored in tar (UNIX tape
archive) files. 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 over the Internet from Internet Literacy\'s
Common Internet File Formats Webpage
(*http://www.matisse.net/files/formats.html*). Both tar files have been
compressed, and may be uncompressed with **gzip**, which is available
free of charge over the Internet via links from the USGS Public Domain
Software page
(*http://edcwww.cr.usgs.gov/doc/edchome/ndcdb/public.html*). When the
tar file is uncompressed and the data is extracted from the tar file, a
directory is produced that contains the data in the package as described
above. The specifics of the tar files are listed below:

**Name of Size of Directory Data package**

**compressed compressed produced when contained**

**tar file tar file extracted from**

**(uncompressed) tar file**

\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--

of00351ps.tar.gz 18.4 MB (206.9 MB) ps/ PostScript Plotfile Package

of00351pdf.tar.gz 5 MB (5 MB) pdf/ Portable Document Format Package

of00351db.tar.gz 14.5 MB (148.3MB) db/ Digital Database Package

**PostScript plot files**

For those interested in the geology of the northwestern Oregon region of
the Salem East and Turner 7.5 minute quadrangles who don\'t use an
ARC/INFO compatible GIS system we have included a separate data package
with three PostScript plot files. The first two each contain a color
plot of the geologic map database at 1:24,000 scale (Sheet 1 and 2,
slm.ps, tnr.ps). Because this release is primarily a digital database,
the plot files (and plots derived therefrom) have not been edited to
conform to U.S. Geological Survey standards. Small units have not been
labeled with leaders and in some instances map features or annotation
overlap. Sample plots by the authors have proven to be quite legible and
useful, however. The PostScript image of the geologic maps are 35 by 32
inches (Sheets 1 and 2), so they require a large plotter to produce
paper copies at the intended scale.

The PostScript plot files for maps were produced by the PostScript
command using the uncompressed option in ARC/INFO version 7.2.1 for
Unix. Encapsulated PostScript files, as well as the map templates
(salem_comb2_o.eps, turner_comb_o.eps) contain a color plot of the
cross-sections, list of map units, description of map units, and
references, in map collar, (it was used as Placed EPS in the PostScript
file from ARC/INFO).

The final ARC/INFO PostScript files (slm.ps and tnr.ps ) contain an
Encapsulated PostScript file generated by Adobe Illustrator version 8
(salem_comb2_o.eps and turner_comb_o.eps ) and placed into the ARC/INFO
graphic metafile by an ARC plotting AML. This EPS file includes the
marginal graphics and explanation of the map.

The Plot AML's (salem_plot.aml and turner_plot.aml) use the coverages
and grids to produce a printable PostScript file of the Turner and Salem
E. files. The import.aml imports all the export (.e00) files into
ARC/INFO.

PDF plot files

We have also included a second digital package containing PDF versions
of the PostScript map sheets described above. Adobe Acrobat PDF
(Portable Document Format) files are similar to PostScript plot files in
that they contain all the information needed to produce a paper copy of
a map and they are platform independent. Their principal advantage is
that they require less memory to store and are therefore quicker to
download from the Internet. In addition, PDF files allow for printing of
portions of a map image on a printer smaller than that required to print
the entire map without the purchase of expensive additional software.
All PDF files in this report have been created from PostScript plot
files using Adobe Acrobat Distiller. In test plots we have found that
paper maps created with PDF files contain almost all the detail of maps
created with PostScript plot files. We would, however, recommend that
those users with the capability to print the large PostScript plot files
use them in preference to the PDF files.

To use PDF files, the user must get and install a copy of Adobe Acrobat
Reader. This software is available free from the Adobe website
(***http://www.adobe.com***). Please follow the instructions given at
the website to download and install this software. Once installed, the
Acrobat Reader software contains an on-line manual and tutorial.

There are two ways to use Acrobat Reader in conjunction with the
Internet. One is to use the PDF reader plug-in with your Internet
browser. This allows for interactive viewing of PDF file images within
your browser. This is a very handy way to quickly look at PDF files
without downloading them to your hard disk. The second way is to
download the PDF file to your local hard disk, and then view the file
with Acrobat Reader. We strongly recommend that large map images be
handled by downloading to your hard disk, because viewing them within an
Internet browser tends to be very slow.

To print a smaller portion of a PDF map image using Acrobat Reader, it
is necessary to cut out the portion desired using Acrobat Reader and the
standard cut and paste tools for your platform, and then to paste the
portion of the image into a file generated by another software program
that can handle images. Most word processors (such as Microsoft Word)
will suffice. The new file can then be printed. Image conversion in the
cut and paste process, as well as changes in the scale of the map image,
may result in loss of image quality. However, test plots have proven
adequate.

**Digital database format**

The databases in this report were compiled in 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). The files are in either GRID (ARC/INFO raster data)
format or COVERAGE (ARC/INFO vector data) format. Coverages are stored
in uncompressed ARC export format (ARC/INFO version 7.2.1 for Unix).
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). The digital
compilation was done in version 7.2.1 of ARC/INFO for Unix.

**Obtaining the Digital Database and Plotfile Packages**

 The digital data can be obtained in any of three ways:

a\. From the Western Region Geologic Information Web Page.

b\. Anonymous ftp over the Internet

c\. Sending a cd with request

 **To obtain tar files of database or plot file packages from the USGS
web pages:**

> The U.S. Geological Survey now supports a set of graphical pages on
> the World Wide Web. Digital publications (including this one) can be
> accessed via these pages. The location of the main Web page for the
> entire USGS is
>
> http://www.usgs.gov

The Web server for digital publications from the Western Region is

> http://geopubs.wr.usgs.gov

Go to

> http://geopubs.wr.usgs.gov/open-file/of00-351
>
> to access this publication. Besides providing easy access to the
> entire digital database, the Western Region Web page also affords easy
> access to the PostScript plot files for those who do not use digital
> databases (see below).

**To obtain tar files of database or plot file packages by ftp:**

> The files in these reports are stored on the U.S. Geological Survey
> Western Region FTP server. The Internet ftp address of this server is:
>
> ftp://geopubs.wr.usgs.gov
>
> The user should log in with the user name anonymous and then input
> their e-mail address as the password. This will give the user access
> to all the publications available via ftp from this server.
>
> The files in this report are stored in the subdirectory:
>
> pub/open-file/of00-351

**To obtain tar files of database or plot file packages on tape:**

Database files, PostScript plot files, and related files can be obtained

by sending a compact disk (CD) with request and return address to:

 

NE Oregon, Salem East and Turner 7.5 minute Geologic Map Plotfiles

c/o Database Coordinator

> U.S. Geological Survey
>
> 345 Middlefield Road, M/S 975
>
> Menlo Park, CA 94025

**Do not omit any part of this address!**

NOTE: Be sure to include with your request the exact names, as listed
above, of the tar files you require. An Open-File Report number is not
sufficient, unless you are requesting both the database package and plot
file package for the report.

The compressed tar file will be returned on the compact disk.

**Obtaining plots from a commercial vendor**

Those interested in the geologic maps of the the northwestern Oregon
region of the Salem East and Turner 7.5 minute quadrangles, but who use
neither a computer nor the Internet, can still obtain the information.
We will provide the PostScript plot files on digital compact disk
(details below) for use by commercial vendors who can make large-format
plots. Send a blank compact disk (CD) with request and return address
to: 

NE Oregon, Salem East and Turner 7.5 minute Geologic Map Plotfiles

c/o Database Coordinator

U.S. Geological Survey

345 Middlefield Road, M/S 975

Menlo Park, CA 94025

 

**Do not omit any part of this address!**

The compressed tar file will be returned on the compact disk.

Make sure your vendor is capable of reading compact disks and PostScript
plot files. Important information regarding compact disk format is
included in the sections \"Database Release Format\", \"Tar Files\", and
\"PostScript Plot Files\" above, so be certain to provide a copy of this
document to your vendor. 

Obtaining plots from USGS Open-File Services

U.S. Geological Survey is providing a plot-on-demand service for map
files, such as those described in this report, through Open-File
Services. In order to obtain plots, contact Open-File Services at:

**USGS Information Services**

> **Box 25286**
>
> **Denver Federal Center**
>
> **Denver, CO 80225-0046**
>
> **(303) 202-4200**
>
> **1-800-USA-MAPS**
>
> **FAX: (303) 202-4695**
>
> **e-mail:** <infoservices@usgs.gov>

 Be sure to include with your request the Open-File Report number and
the exact names, as listed in the Database Contents section above, of
the plot files you require. An Open-File Report number and its letter
alone may not be sufficient, unless you are requesting plots of all the
plot files for that report.

 **Converting ARC export files**

 ARC export files are converted to ARC coverages using the ARC command
IMPORT with the option COVER. To ease conversion and 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. 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**

 Several different coverages were generated during the construction of
the two geologic quadrangle maps. The topgraphic base map separates
remain as grids, and are merged at the last step with the colored
geology polygrids. The raster geology grids were converted to vector
coverages with ARC/INFO\'s gridline routine. Alacarte and some custom
menus and amls were used to project, transform, edit, tag and build,
lines, polygons, and points in each map. A digital layout or map collar
was made with Adobe Illustrator. The plot amls run in ARC/INFO and call
the coverages, grids, and EPS to make uncompressed PostScript files. All
maps are in UTM projection, zone 10, units meters, 1:24,000 scale. The
pamphlet that describes the geology is saved to EPS from Microsoft Word.

**Annotation**

Within the structural coverage is an annotation showing dip amount
associated with each attitude. This annotation layer is called by the
plot aml used by ARC/INFO, using a custom ARC textset, johanna.txt. The
plot aml convert all coverages into a PostScript file. Map unit labels
(not annotation) are used to label geology polygons. Smaller polygons,
in which the label would not fit, can be identified on plots by the
color of the polygon.

**Base maps**

The source of the base maps used is the U.S. Geological Survey, 1:24,000
scale topographic maps, which have 10-foot contour intervals (1979).
Topographic base separates for the Salem East and Turner 7.5 minute
quadrangles were scanned on an ANATEK rasterizing scanner at 600 dpi as
1-bit TIFF images. Scanned TIFF images of the bases were registered and
rectified in ARC/INFO and then made into grids. The images were clipped
using ARC/INFO grid to conform to the area of the geologic coverages and
merged with the geology grid to give an apparent transparent color image
of both combined. These base map-geology layers are digital images but
no information other than location is attached to the lines. The
base-geology maps are 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.

 **Database specifics**

The map databases consist of ARC coverages and supporting INFO files,
which are stored in a UTM (Universal Transverse Mercator) projection
(Table 1). Digital tics define a 7.5 minute grid of latitude and
longitude in the coverages corresponding with quadrangle corners.

** Table 1 -** *Map Projection*

The maps are stored in UTM projection

PROJECTION UTM

UNITS METERS -on the ground

ZONE 10 -UTM zone

PARAMETERS

END

The content of the geologic database can be described in terms of the
lines, points, 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, faults, 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 Table 4.

Table 3 - *Content of the Arc Attribute Tables*  

ITEM NAME WIDTH OUTPUT TYPE N.DEC Description

 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 Table 4)

 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 (listed by coverage
name)*

[]{.mark}

**slm_geo**

contact, inferred

map boundary

normal fault, concealed

normal fault, concealed \_m

normal fault, concealed, queried

normal fault, concealed, queried \_m

normal fault, inferred

normal fault, inferred \_m

**slm_stx**

cross section

f.a., monocline, certain

f.a., monocline, certain \_m

f.a., monocline, certain, plunge

f.a., syncline, inferred

f.a., syncline, inferred \_m

**tnr_geo**

contact, inferred

map boundary

normal fault, certain

normal fault, certain \_m

normal fault, concealed

normal fault, concealed \_m

normal fault, inferred

normal fault, inferred \_m

**tnr_stx**

cross section

f.a., monocline, certain

f.a., monocline, certain \_m

f.a., monocline, certain, plunge

map boundary

**tnr_ann**

leader

**Areas**

Map units (polygons) are described in the polygon attribute table (Table
5) The identities of the map units from compilation sources are recorded
in the PTYPE field by map label (Table 6). Note that ARC/INFO coverages
cannot contain both point and polygon information, so only coverages
with polygon information will have a polygon attribute table, and these
coverages will not have a point attribute table. More complete
descriptions of the various rock units can be found in the geologic
report that accompanies the Tolan, Beeson, and Wheeler (1999) dataset,
geol.txt or geol.ps.

 

**Table 5** *- Content of the Polygon Attribute Tables*

 

ITEM NAME WIDTH OUTPUT TYPE N.DEC Description

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

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 6** *- Map Units*

(See geol.txt or geol.ps in Tolan, Beeson, and Wheeler (1999) for
descriptions of units)

**slm_geo**

Qal

Qoal

Tfr

Tfsh

Tfsf

Tgsb

Tgww

Tms

**trn_geo**

Qal

Qt

Qls

Qoal

QTfs

Tfr

Tfsh

Tfsh?

Tfsf

Tfg

Tgsb

Tgww

Tgo

Tms

Points

Data gathered at a single locality (points) are described in the point
attribute table (Table 7). The identities of the points from compilation
sources are recorded in the PTTYPE field by map label (Table 8). Map
units are described more fully in the text file geol.txt or geol.ps in
Tolan, Beeson, and Wheeler (1999). Note that ARC/INFO coverages cannot
contain both point and polygon information, so only coverages with point
information will have a point attribute table, and these coverages will
not have a polygon attribute table. Of these two maps, Turner has point
attribute data, and Salem East does not.geo

**Table 7** *-- Content of the Point Attribute Table (slm_stx contains
lines only)* 

Geologic Attitudes

ITEM NAME WIDTH OUTPUT TYPE N.DEC

AREA 4 12 F 3

PERIMETER 4 12 F 3

TRN_STX# 4 5 B

TRN_STX-ID 4 5 B

PTTYPE 35 35 C

DIP 3 3 I

STRIKE 3 3 I

SEL 1 1 I

SYMB 3 3 I

Acknowledgments

We wish to thank Scott Graham for the digital review of this Open File
Report 00-351.

 

References Cited

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.

Tolan, T.L., Beeson, M.H., and Wheeler, K.L., 1999, Geologic map of the
Scotts Mills, Silverton, and Stayton Northeast 7.5\' quadrangles,
northwest Oregon: A digital database: U.S. Geological Survey Open-file
Report 99-141, 11 p., scale 1:24000,
http://wrgis.wr.usgs.gov/open-file/of99-141.

Wentworth, C.M., and Fitzgibbon, T.T., 1991, ALACARTE user manual
(version 1.0): U.S. Geological Survey Open-File Report 91-587C.