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In the short summer, water scours the glacier surface creating a ripple-like surface on the ice going down-glacier. At the end of the season, when the first major snow falls the rough surface becomes once again smooth. This was taken at the end of the day when I could really see the shadows from those ripples. It kind of looks like little waves on the glacier.
McGinnis Peak is an 11,400 ft (3,470 m) tall mountain in the eastern Alaska Range. It rises almost 6,000 feet over the glacier below.