Text and Photographs ©copyright 1996 Dale T. Andersen. All Rights Reserved. Reproduced with permission.
[276, 34k jpeg] Polygonal Cracking, Alatna Valley
Polygonal cracking can be seen on the floor of Alatna Valley. These polygons are a result of freeze thaw processes in permafrost. The polygons in this photo have been highlighted by recent snowfall.
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