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Open-File Report 99-523

Preliminary Digital Map of Cryptocrystalline Occurrences in Northern Nevada

By Lorre A. Moyer

Thumbnail of and link to report PDF (260 kB)Introduction

The purpose was to identify potential cryptocrystalline material sources for tools used by indigenous people of the northern Nevada portion of the Great Basin. Cryptocrystalline occurrence data combed from the U.S. Geological Survey's Mineral Resources Data System (MRDS, 1995) were combined with sites described in Nevada rockhound guides and entered into a geographic information system (GIS). The map area encompasses northern Nevada (fig.1). This open-file report describes the methods used to convert cryptocrystalline occurrence data into a digital format, documents the file structures, and explains how to download the digital files from the U.S. Geological Survey's World Wide Web site. Uses of the spatial dataset include, but are not limited to, natural and cultural resource management, interdisciplinary activities, recreational rockhounding, and gold exploration. It is important to note that the accuracy of the spatial data varies widely, and for some purposes, field checks are advised.

First posted December 18, 2000

MRDS shapefiles for use in Arc View

Rockhound shapefiles for use in Arc View

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/

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Suggested citation:

Moyer, Lorre A., 1999, Preliminary Digital Map of Cryptocrystalline Occurrences in Northern Nevada: U. S. Geological Survey Open-File Report 99-523, 40 pp., https://pubs.usgs.gov/of/1999/0523/.


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