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This quadrangle lies 6.4 km (4 mi) northeast of Bozeman, Mont., insouthwestern Montana. Metamorphic, sedimentary, and volcanic rocksof Precambrian to Tertiary age are exposed in the Bridger Range andsouthwestern margin of the Crazy Mountains Basin in a crustal crosssection and a structural triangle zone. Surface geology recordsPrecambrian extension, Late Paleocene east-vergent contraction,including backthrusts, and Holocene basin-range extension.
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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 Investigations Series Map I-2584. These maps were compiled, digitized, and produced using the USGS software program GSMAP. All the original source maps were simplified on mylar overlays, digitized at their original map scales and projections, and then merged into the final maps. After editing, the digital maps were filtered to remove all points not necessary for improving resolution at a scale of 1:126,720 (2 mi per in., the scale used by the USDA Forest Service)....


    map background search result map search result map Geologic map of the Sedan quadrangle, Gallatin andPark Counties, Montana Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Northern portion Geologic map of the Sedan quadrangle, Gallatin andPark Counties, Montana Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Northern portion