San Diego, CA
Devil's Postpile - Frozen Columns Of Lava
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© Christine Till - CT-Graphics
Devils Postpile is a U.S. National Monument located in the Sierra Nevada Mountains west of Mammoth Lakes, California.
The Devils Postpile formation is a rare sight in the geologic world and ranks as one of the world's finest examples of columnar basalt. Its columns tower 60 feet high, have an average diameter of 24 inches and display an unusual symmetry. Though the Postpile began as a molten mass, it shrank as it cooled, and it began to crack. Temperatures inside the lava bed were consistent enough to allow the cooling basalt to form six-sided columns.
The Postpile's regularity of shape is probably its most remarkable feature. Temperatures are rarely consistent enough to form columns such as are seen here.
April 3rd, 2011
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