Summer 2008: WINDING ROAD 40 YEARS AFTER Pirsig's Cathartic Journey; A Photonarrative by Marc G. Boileau  
Yellowstone basalt postpile

Yellowstone basalt postpile

Description : A basaltic postpile intrusion in Yellowstone. Similar to the Devils Tower and other locations these columns of stone signal the volcanic nature of the Park.

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