U.S. Geological   Survey   Miscellaneous Investigations Series Map I-1509ADigital Database version 1.0

## **Geologic   and Structure Maps of the Wallace 1° x 2° Quadrangle, Montana and Idaho: A Digital   Database**

*By***Jack E. Harrison, Allan B. Griggs, and John D. Wells**

*Digital   Database By***William   N. Kelley, Pamela D. Derkey, and EROS Data Center**

| **INTRODUCTION**

The geologic         map of the Wallace 1° x 2° quadrangle (Harrison and others,         1986) was originally digitized by staff at the Earth Resources Observation         Systems (EROS) Data Center prior to 1994 and completed by U.S. Geological         Survey staff and contractors at the Spokane Field Office (WA) in 2000         for input into a geographic information system (GIS). The resulting digital         geologic map database can be queried in many ways to produce a variety         of geologic maps. Digital base map data files (topography, roads, towns,         rivers and lakes, etc.) are not included: they may be obtained from a         variety of commercial and government sources. This database is not meant         to be used or displayed at any scale larger than 1:250,000 (e.g., 1:100,000         or 1:24,000). The digital geologic map graphics and plot files (wal250k.gra/.hp)         that are provided in the digital package are representations of the digital         database. They are not designed to be cartographic products. The map area         is located in north Idaho and western Montana (see Fig. 1 on map). This         report describes the methods used to convert the geologic map data into         a digital format, the ArcInfo GIS file structures and relationships, and         explains how to download the digital files from the U.S. Geological Survey         public access World Wide Web site on the Internet. We thank Karen S. Bolm         (USGS) for her review of the manuscript and digital data. |
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|  **Description         of files available to download**
 **File         size** README       file listing all files available for download
8 KB 
 I-1509-A         in Portable Document Format (PDF)

Get Adobe         Acrobat Reader to view pdf files
940 KB 
 Complete         digital data package

Utilities         to extract **TAR** and **GZIP** files on your Windows or Macintosh
8.8 MB  Metadata       file (ASCII text file)
16 KB 
 Map         Files in HPGL2 format as a UNIX compressed (and, in some cases, TAR)         file.
- Map scale: 1:250,000               Page size: approximately           43" x 28" 
  
3.1 MB 
For questions about the   content of this report, contact Pamela Derkey

 The original   publication by Harrison, Griggs, and Wells (1986) is available from:

USGS Information   Services, Box 25286,   Federal Center, Denver, CO 80225  telephone: 303-202-4210; e-mail: infoservices@usgs.gov

URL of this page:   https://pubs.usgs.gov/imap/i1509a/  Maintained by: Mike Diggles  Created: October 3, 2000  Last modified: June 23, 2005 (mfd)

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