The digital ARC/INFO databases included in this website provide a GIS database for the geologic map of the Dillon 1 degree by 2 degree quadrangle of southwest Montana and east-central Idaho. The geologic map was originally published as U.S. Geological Survey Miscellaneous Investigations Series Map I-1803-H. This website directory contains ARC/INFO format files that can be used to query or display the geology of USGS Map I-1803-H with GIS software.
Additional publication details
USGS Numbered Series
Geologic map of the Dillon 1 degree by 2 degrees Quadrangle, Idaho and Montana
1 map :col. ;45 x 63 cm., on sheet 104 x 127 cm., folded in envelope 30 x 24 cm.