U.S. DEPARTMENT OF THE INTERIOR
                     U.S. GEOLOGICAL SURVEY
                                			
        SURFACE GAMMA-RAY SURVEY OF THE BARRE WEST QUADRANGLE, 
              WASHINGTON AND ORANGE COUNTIES, VERMONT

                               by
                                
                       Gregory J. Walsh (1)

                        
                              and 

                       Aaron M. Satkoski (2)

                                
              Scientific Investigations Report 5276
                                             
                              2005
                                
                           version 1.0
                                
                 Prepared in cooperation with the
                   
                   Vermont Geological Survey



________________________________
(1) U.S. Geological Survey
Montpelier, Vermont 05601

(2) Acadia University
Department of Geology 
Wolfville, Nova Scotia B4P 2R6 Canada




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Source of Data:
Original data.  Gamma ray survey conducted by Walsh and Satkoski in 2003.
Survey conducted with a Geofyzika GS-512 portable gamma ray spectrometer.
Location information was collected with a general purpose hand-held GPS 
receiver (Garmin eTrex Venture).

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File directory layout:

|--README.TXT---ASCII text description (this file)
|--METADATA.HTM---Metadata file in HTML format
|--METADATA_FAQ.HTM---Metadata file of Frequently Asked Questions (HTML)
|--SIR055276.pdf---Text pamphlet
|            
|---EXPORT---Folder - Contains Arc/Info GIS export-interchange file       
|                                                        
|---SHAPE---Folder - Contains ArcView GIS point and tic shapefiles 
|            
|
|---SDTS---Folder - Contains database in SDTS format (geographic coordinates 
|          in decimal degrees)
|
|---BASE---Folder - Contains basemap image file and worldfile in DRG format
|

All of the files except for the text pamphlet PDF file are included 
in SIR055276.ZIP. The ZIP file and the PDF text pamphlet are available from 
the web site below.

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This report is available online at
http://pubs.usgs.gov/sir/2005/5276/

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Description:
This study presents the results from a ground-based gamma-ray survey 
of bedrock outcrops in the 7.5-minute Barre West quadrangle, Vermont. 
Data were collected with a Geofyzika 512-channel portable gamma-ray 
spectrometer (GS-512) with a sodium iodide, thallium-activated 
scintillation probe.   During the summer of 2003, 493 data points were 
collected at outcrops throughout the Barre West quadrangle.  Two detailed 
transects were conducted at two roadcuts along Interstate 89 at Exits 7 
and 8 to identify outcrop-scale differences in gamma radiation emissions.

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Projection information for Shapefiles and Coverages:
             COORDINATE SYSTEM DESCRIPTION
Projection     STATEPLANE
Zone           5526 (Vermont)
Datum          NAD83
Units          METERS             
Spheroid       grs1980

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Projection information for SDTS data:
             COORDINATE SYSTEM DESCRIPTION
Projection           GEOGRAPHIC
Datum                     NAD83
Units                        DD             
Spheroid                GRS1980

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Direct questions or comments on the data to:
Gregory J. Walsh
U.S. Geological Survey
P.O. Box 628 
Montpelier, VT 05601
Tel: 802-828-4528
e-mail:  gwalsh@usgs.gov

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Date of latest revision: February 21, 2006

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The GIS data associated with this report are provided in common 
GIS formats.  

The GIS data were created in ARC/INFO version 9.0 on a Dell PC running 
Windows XP Pro.

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Useful link: 
Vermont Center for Geocgraphic Information (VCGI)
http://www.vcgi.org

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Computer Files:

Some files have been archived using WinZip.  
Useful URL:
http://winzip.com
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********************************************************************
The following is a brief description of the geologic data layers, 
tables, and non-standard attributes used in this report.
********************************************************************
GRS_0813 - Point data layer with survey results
(Note: Name format "0813" conforms with data from www.vcgi.org)
(Note:  Original GPS coordinates in the attribute table were collected in Degrees Minutes Seconds in WGS84 datum)
  .PAT or .DBF items:
    station - unique numeric identifier for each measurement
    latdeg - latitude degrees 
    latmin - latitude minutes
    latsec - latitude seconds
    latdd - latitude in decimal degrees
    longdeg - longitude degrees 
    longmin - longitude minutes
    longsec - longitude seconds
    longdd - longitude in decimal degrees
    outcrop - type of outcrop, natural or man-made cut
    K_orig - potassium in percent from spectrometer
    U_orig - equivalent uranium (eU) in parts per million (ppm)
    TH_orig - equivalent thorium (eTh) in parts per million (ppm)
    rock - Formation name and/or rock type or rock grouping
    rock1 - specific rock type at measurement point
    
************************************************************************
The following is a description of the base maps used in this report:

Topographic base:
A digital raster graphic (DRG) is supplied with the database, but was
not used in the text pamphlet.  The DRG was obtained from VCGI.

Surface water, roads, and town boundaries:
Surface water, roads, and town boundariess shown in the text pamphlet
were obtained from VCGI.  These data are not re-distributed in this 
report.
  
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END