Structural Geology – Active Tectonics
Normal faults in Lewis Thrust fault zone, Glacier National ParkNormal faults extend the upper plate of Proterozoic rock of the Lewis Thrust. Montana's Rocky Mountains
Chief Mountain Klippe, Glacier National Park, Montana and mountaChief Mountain, a klippe of the Lewis Thrust fault, at the US-Canada border in Glacier National Park, Montana. The fault places resistant rock of the Late Precambrian Belt Supergroup over softer Cretaceous-age sandstone and shale --and so lies at the base of the cliffs, all along the mountain front. Several smaller klippen lie to the left of Chief Mountain, between it and the rest of the range.
