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$Baring Creek flows through a very narrow gorge, called Sunrift Gorge, in Glacier National Park, Montana. The gorge has very smooth, straight sides because it eroded along vertical fractures in the rock known as joints. Sunrift Gorge began to form after large Pleistocene glaciers began to retreat from that area and with a maximum cut down rate of 0.003 inch per year, this gorge is the result of several millions of years of erosion.$