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U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
The Highway passes through geologically diverse environments. Shown here, Pilot and Index Peaks in the Absaroka Range are examples of mountains formed by volcanic processes, while the Beartooth Range is of granitic origin and represents some of the oldest rocks in the world.
Public Domain. Courtesy of U.S. Forest Service - Custer or Gallatin NF, MT
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