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Geologic map of the Dillon 1°x2° quadrangle, Idaho and Montana

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 orginally published as U.S. Geological Sur

Geologic map of the Ennis 30' X 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming

The Ennis 1:100,000 quadrangle lies within both the Laramide (Late Cretaceous to early Tertiary) foreland province of southwestern Montana and the northeastern margin of the middle to late Tertiary Basin and Range province. The oldest rocks in the quadran

Geologic Map of the Ennis 30 X 60 minute quadrangle, Madison and Gallatin counties, Montana

Geologic map of the Ennis 30x60 minute quadrangle, Gallatin and Madison Counties, Montana

Geologic map datasets of the Custer and Gallatin National Forests of South-central Montana, in ARC/INFO format: Western portion

The geology of western and northern Gallatin National Forest was mapped in two parts as part of an evaluation of its mineral resource potential by the USGS. Previously, the western part was released as Map A and the northern part as Map B of USGS Geologic