The following is a description of the directories included in this 
open-file report. 

GEOTIFF		geo-registered digital maps as tif files  
GIS			selected files for geographic information systems use
GRIDS           	grid files in ESRI and Geosoft formats
REPORT          	this open-file report and contractors report
SOFTWARE		software packages that can be used to manipulate and view 					digital data in this open_file
FIGURES     	digital maps and plates for reports

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Geosoft	see www.geosoft.com: produces geophysical data processing software
ESRI		see www.ESRI.com: produces geographic information system software

Any use of company names or products does not directly or indirectly imply endorsement by the U.S. Geological Survey.