Silkwood, Jeffery T.

About the author


Geologic map datasets of the Custer and Gallatin National Forests of South-central Montana, in ARC/INFO format: Absaroka-Beartooth study area

The digital ARC/INFO databases included in this directory provide a geologic map GIS database of the Absaroka-Beartooth study area (ABSA), a tract of approximately 1.4 million acres of National Forest land in southwestern Montana. The ABSA is adjacent to

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

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

The digital ARC/INFO databases included in this directory provide a geologic map GIS database of the Custer National Forest in the Pryor Mountains of south-central Montana. The geologic map area comprises approximately 122 square miles (316 square kilome

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

Geologic and structure map of the Choteau 1 x 2 degree quadrangle, western Montana: a digital database.

The geologic and structure map of Choteau 1 x 2 degree quadrangle (Mudge and others, 1982) was originally converted to a digital format by Jeff Silkwood (U.S. Forest Service and completed by the U.S. Geological Survey staff and contractor at the Spokane