Data notes  for the geologic map of the Stephens City 7.5 minute quadrangle, U.S. Geological Survey Open-file Report 06-1173:

All data is projected to UTM Zone 17N, Datum NAD83, units meters

Graphics, suitable for printing (map ~53"x32" at 100%) of the full map layout with description of map units, discussion, etc. are in the graphics subdirectory. These files are in Adobe Acrobat .pdf format and Adobe Illustrator .eps format. The Adobe Acrobat Reader is available free, online at:  http://www.adobe.com/products/acrobat/readstep2.html

An ArcMap 9.1 project is contained in the steph_city.mxd file. It displays the geologic data and basemap with appropriate symbology. It does not contain the description of map units, discussion, or ancillary graphics found in the full graphics layouts. ArcMap 9.0 or higher is required to view this file.

The base map is a digital raster graphic of the U.S. Geological Survey Winchester 7.5 minute quadrangle. A copy is in the GIS_data\basemap\ subdirectory.

The GIS layers are in the form of an ESRI geodatabase with copies also provided as shapefiles. The file name abbreviations are:

sc_alluvium = Quaternary alluvium, polygons
sc_bedrock = bedrock units, polygons
sc_faults = faults, lines
sc_linstrux = linear structures, lines
sc_sinkholes = sinkhole outlines, polygons
sc_springs = springs, points
sc_strux = data stations, units, bedding, joints, cleavage, etc.; points

The geodatabase is in the GIS_data\ subdirectory 
ESRI shapefiles are stored in the GIS_data\shapefiles subdirectory
Metadata files for all of the layers are in the metadata\ subdirectory

This data is available on the internet at:  http://pubs.usgs.gov/of/2006/1173/.
If these files are too large for download contact David Weary dweary@usgs.gov for CD-ROM copy.