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https://www.usgs.gov/maps/geologic-map-sedan-quadangle-gallatin-and-park-counties-montana
Geologic map of the Sedan quadangle, Gallatin and Park Counties, Montana | U.S. Geological Survey
This quadrangle lies 6.4 km (4 mi) northeast of Bozeman, Mont., in southwestern Montana. Metamorphic, sedimentary, and volcanic rocks of Precambrian to...