2012_11_23 Blackhawk Slide
A series of shots showing Blackhawk Slide, a landform that moved dramatically in place about 17,000 years ago. According to the prevailing geologic theory, the north face of Blackhawk Mountain broke free as a unit and slid as a sheet, remaining surprisingly intact, for a distance of almost five miles. By the theory, it rode a cushion of air, at speeds perhaps as high as 270 miles per hour. The volume is three billion cubic feet.
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