Meeting of the Glaciers
A small, vigorous glacier coming down Mill D South Fork met the larger sluggish glacier from the main canyon and the two wedged together and stagnated at this point.
The low smooth hill over your left shoulder, is a terminal moraine made up of rock debris deposited by the glaciers.
The L-shaped canyon above is a typical glaciated valley, contrast this with the V-shaped, stream cut canyon below.
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