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Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field values and locations. This dataset presents latitude, longitude, altitude, and magnetic-field values.
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The digital ARC/INFO databases included in this websiteprovide a GIS database for the geologic map of theDillon 1 degree by 2 degree quadrangle of southwestMontana and east-central Idaho. The geologic mapwas orginally published as U.S. Geological SurveyMiscellaneous Investigations Series Map I-1803-H.This website directory contains ARC/INFO format filesthat can be used to query or display the geology ofUSGS Map I-1803-H with GIS software.
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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)....
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The Ennis 1:100,000 quadrangle lies within both the Laramide (LateCretaceous to early Tertiary) foreland province of southwesternMontana and the northeastern margin of the middle to late TertiaryBasin and Range province.The oldest rocks in the quadrangle are Archean high-grade gneiss, andgranitic to ultramafic intrusive rocks that are as old as about 3.0Ga. The gneiss includes a supracrustal assemblage of quartz-feldspargneiss, amphibolite, quartzite, and biotite schist and gneiss. Thebasement rocks are overlain by a platform sequence of sedimentaryrocks as old as Cambrian Flathead Quartzite and as young as UpperCretaceous Livingston Group sandstones, shales, and volcanic rocks.The Archean crystalline rocks crop...


    map background search result map search result map Geologic Map of the Ennis 30 X 60 minute quadrangle, Madison and Gallatin counties, Montana Aeromagnetic data for Tobacco Roots, Montana Geologic map of the Dillon 1�x2� quadrangle, Idaho and Montana Geologic map of the Ennis 30' X 60' quadrangle, Madison andGallatin Counties, Montana, and Park County, Wyoming Geologic Map of the Ennis 30 X 60 minute quadrangle, Madison and Gallatin counties, Montana Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Western portion Aeromagnetic data for Tobacco Roots, Montana Geologic Map of the Ennis 30 X 60 minute quadrangle, Madison and Gallatin counties, Montana Geologic map of the Ennis 30' X 60' quadrangle, Madison andGallatin Counties, Montana, and Park County, Wyoming Geologic Map of the Ennis 30 X 60 minute quadrangle, Madison and Gallatin counties, Montana Geologic map datasets of the Custer and Gallatin National Forestsof South-central Montana, in ARC/INFO format: Western portion Geologic map of the Dillon 1�x2� quadrangle, Idaho and Montana