Notes to users:

This README.txt file is meant to give the user a quick overview of
the files used to create the Generalized Geologic Map of Alaska, Hawaii,
Puerto Rico, and the U.S. Virgin Islands.  For more complete and 
detailed information please refer to the included metadata file, 
geology01.txt.

If you have any questions about these coverages please contact
Chuck Bush USGS Denver (303)236-4723.

Browse Graphics:
Please note that these graphic files were produced using ARCInfo
coverages in the Lambert_Azimuthal projection to match the images seen 
on the National Atlas Web site.

usgeoplot.pdf--Plotfile produced by Arc/Info and converted to PDF format
usgeoexp.pdf--Graphics file of the map explanation

Metadata:

geology01.txt

Coverages:

geol01m075.e00
geol01l075.shp
geol01p075.shp
Geologic units as polygons.
        Rock and material that lies at or near the land surface, but not
        surficial materials such as soils, alluvium, and glacial 
        deposits.  The units are defined by sedimentary, volcanic, 
        plutonic, or metamorphic rock types and by their geologic age. 
        The Text attribute is included to provide a method for 
        generating the appropriate map symbols for display and 
        publication purposes.  Data are unprojected in decimal degrees.

fltg01l075.e00*
fltg01l075.shp*
Fault lines with line decorations. 
        A fault is a fracture or fracture zone in the Earth's crust 
        along which one side moves with respect to the other.  This 
        data set includes both the faults and the line decorations.  
        Only useful in Lambert Azimuthal projection.

falt01l075.e00**
falt01l075.shp**
Fault lines without line decorations.
        A fault is a fracture or fracture zone in the Earth's crust 
        along which one side moves with respect to the other.

gtxt01l075.e00*
gtxt01l075.shp*
Graphic representation of geologic unit text.
        Text labels for the geology coverage, represented as lines.  
        Standard geologic symbols are included.  Only useful in 
        Lambert-Azimuthal projection.


      * these files are not 'true' ArcInfo coverages; they are graphic
        representations of symbols and text used on the geologic map.
        These files should be used to produce appropriately symbolized 
        graphics. The decorations and text only appear correctly in 
        Lambert Azimuthal Equal Area projection.
        
      ** these files are the same as the files marked with * but do not
         include the line decorations.  They are the 'true' fault and 
         glacial limit line ArcInfo coverages.  These files should be 
         used for data analysis.

      Any use of trade, product, or firm names is for descriptive 
      purposes only and does not imply endorsement by the U.S. 
      Government.

      Although this README.TXT file is intended to document the data set
      in nonproprietary form, some ArcInfo-specific terminology is 
      included for clarity and expediency.