Lewis Overthrust, Geological thrust fault in Montana, United States.
The Lewis Overthrust stretches across 280 miles from Mount Kidd near Calgary to Steamboat Mountain, displaying older Precambrian rocks positioned over younger Cretaceous formations.
Between 59 and 75 million years ago, tectonic plate collisions forced a thick wedge of Precambrian rock 50 miles eastward over softer Cretaceous rock layers.
The University of Montana maintains educational programs focused on the Lewis Overthrust to teach students about geological processes and mountain formation mechanisms.
Visitors access the geological formation through hiking trails in Glacier National Park, with clear views of the rock layers from Marias Pass observation points.
The thrust fault reveals a rare occurrence where 1400-million-year-old Precambrian sediments rest directly upon much younger Cretaceous period rocks.
Location: Montana
GPS coordinates: 48.93280,-113.60900
Latest update: March 3, 2025 16:32
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