The mountain has a unique and prominent cirque. The cirque is tilted and made up of Paleozoic sedimentary rocks that formed on the floors of ancient seas. It is rare to find sedimentary rocks this high up in Colorado's higher elevations, for most sedimentary stata in the high country were eroded away by glaciers during the ice age. In this case, the glaciers sculpted the strata into a horseshoe shape without eroding it completely.[4][5]
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