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Open-File Report 00-135

Digital Geologic Map of the Coeur d'Alene 1:100,000 Quadrangle, Idaho and Montana

By Steven R. Muntz

Thumbnail of and link to report PDF (588 kB)Introduction

Between 1961 and 1969, Alan Griggs and others conducted fieldwork to prepare a geologic map of the Spokane 1:250,000 map (Griggs, 1973). Their field observations were posted on paper copies of 15-minute quadrangle maps. In 1999, the USGS contracted with the Idaho Geological Survey to prepare a digital version of the Coeur d’Alene 1:100,000 quadrangle. To facilitate this work, the USGS obtained the field maps prepared by Griggs and others from the USGS Field Records Library in Denver, Colorado. The Idaho Geological Survey (IGS) digitized these maps and used them in their mapping program. The mapping focused on field checks to resolve problems in poorly known areas and in areas of disagreement between adjoining maps. The IGS is currently in the process of preparing a final digital spatial database for the Coeur d’Alene 1:100,000 quadrangle. However, there was immediate need for a digital version of the geologic map of the Coeur d’Alene 1:100,000 quadrangle and the data from the field sheets along with several other sources were assembled to produce this interim product.

This interim product is the digital geologic map of the Coeur d’Alene 1:100,000 quadrangle, Idaho and Montana. It was compiled from the preliminary digital files prepared by the Idaho Geological, and supplemented by data from Griggs (1973) and from digital databases by Bookstrom and others (1999) and Derkey and others (1996). The resulting digital geologic map (GIS) 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 1:100,000 (e.g., 1:62,500 or 1:24,000). The digital geologic map graphics (of00-135_map.pdf) that are provided are representations of the digital database.

The map area is located in north Idaho. This open-file report describes the geologic map units, 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

First posted November 30, 2000

  • Data TAR.Z (14.6 MB)
    Contains all files associated with this report (.pdf, .txt, .e00, .gra, .aml, .hp) in a single compressed tar.Z file which can be unzipped using open-source software such as 7 zip. Refer to the Readme and Metadata files for more information.
  • Map PDF (2 MB)
    A full-sized color version of the digital geologic map in Portable Document Format. Map size is 30 inches x 42 inches.

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
345 Middlefield Road, MS 901
Menlo Park, CA 94025-3591
http://geomaps.wr.usgs.gov/gmeg/

Part or all of this report is presented in Portable Document Format (PDF). For best results viewing and printing PDF documents, it is recommended that you download the documents to your computer and open them with Adobe Reader. PDF documents opened from your browser may not display or print as intended. Download the latest version of Adobe Reader, free of charge.


Suggested citation:

Munts, Steven R., 2000, Digital Geologic Map of the Coeur d'Alene 1:100,000 Quadrangle, Idaho and Montana: U.S. Geological Survey Open-File Report 00-135, https://pubs.usgs.gov/of/2000/0135/.



Contents

Introduction

Description of Map Units

Data Sources, Processing, and Accuracy

GIS Documentation

Obtaining Digital Data

Obtaining Paper Maps

Appendix A

Appendix B

Appendix C


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