0readme.txt DOS ASCII file that describes the digital data for U.S. Geological
Survey Open-File Report 03-66 (revised 1/7/2005, pd)

Stewart, J.H., Carlson, J.E., Raines, G.L., Connors, K.A., Moyer, L.A, and Miller, R.J., 2003, Spatial digital database for the geologic map of Nevada: U.S. Geological Survey Open-File Report 03-66, ver. 3.0, 32 p.  Rec'd Director's approval Feb. 20, 2003. URL = http://pubs.usgs.gov/of/2003/of03-66/
  

This report describes the contents of a digital data set which consists of 
ArcInfo exchange-format files and associated files.  Raster images of the 
original printed map sheets are included in this release.  The data set is available on the World Wide Web at http://pubs.usgs.gov/of/2003/of03-66/.  

Requirements:  A networked computer system is required to copy the data set 
from the host computer across the Internet.  A geographic information system 
(GIS) capable of importing ArcInfo exchange-format files is required for 
access to the digital files.  The digital data files are in UNIX ASCII format.

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Explanation of digital data files:

The GIS database for the Geology of Nevada is available as one UNIX compressed 
TAR file, of03-66.tar.Z, which includes the report text (of03-66.pdf) in an 
Adobe Acrobat Portable Document File (PDF) format.

To download the GIS data files, create a new workspace in a UNIX working 
environment and copy the of03-66.tar.Z file to your new workspace. Use the 
command 'uncompress -v of03-66.tar.Z' to uncompress the file. Then use the 
command 'tar -xvf of03-66.tar' to extract the files from the TAR file. 

Or copy the of03-66.tar.Z file to an empty Windows subdirectory. Use an 
unzip software (such as WinZip) to uncompress and extract files from the 
of03-66.tar.Z file.

And finally, to import the ArcInfo exchange-format files (*e00) into your workspace,
open ArcInfo on your workstation and enter '&run importfile' at the Arc prompt
or import the file using ArcToolbox.

Your working directory should contain the following files:
0readme.txt - this file in DOS ASCII format
importfile.aml -  ArcInfo program to import ArcInfo interchange-format files 
                  into the user's workspace.
of03-66.pdf - Open-File Report text in Adobe Acrobat Portable Document File 
             (PDF) format. 

Primary ArcInfo exchange-format files (*.e00) and metadata (*.met) include:

nvgeo.e00 - principal line and polygon geologic map coverage
nvgeo.met - metadata file


JPEG images (*.jpg/.jgw) and Adobe Acrobat (*.pdf) files for the Stewart and 
Carlson (1978) map sheets:

sc1978nv_north.jpg/.jgw - georeferenced raster image of north half of the geologic map
sc1978nv_south.jpg/.jgw - georeferenced raster image of south half of the geologic map
sc1978nv_sym.pdf -  explanation of line symbols used on the geologic map
sc1978nv_units.jpg - image of the correlation of map units for the geologic map