John Muir Trail 2013

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Columnar joints, Devils Postpile National Monument. Columnar joints form as igneous rocks shrink during cooling. The columnar joints here are a world famous occurence, often pictured in textbooks, and rival localities such as Giant's Causeway, Ireland, and Devils Tower, Wyoming.

All images copyright © 2013 F.W. Vollmer and may not be used without permission.