Glacial Erosion and polygonal Joints, Devil's Postpile, California

Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay

Location: 37o 37' 30" N, 119o 05' 05" W.

Devil's Postpile is a small lava flow a few million years old. As the flow cooled, it shrank and broke up into neat columns. This view shows the top of the columns, arranged in a neat honeycomb pattern. The rock has been smoothed off by glaciers, and the lines running away from the picture were made by pebbles trapped in the ice.

Original Scene

(author's image)

Possible Coloring

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Created 25 November 2005, Last Update 20 January 2020