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Looks like a Music Organum

Cliffs line the road between Tower Falls & Mammoth at Yellowstone National Park USA, resemble the giant stony pipes of a cathedral organ.

Extremely volatile periods in Yellowstone’s history of volcanic activity were characterized by extensive lava flows. When the lava flows came to an end about 75,000 years ago, many of park’s spectacular sites, such as these basalt cliffs, were created.

The most common form of solidified lava, basalt is a darkigneus rock that was extruded to the Earth’s surface by volcanic action. Once deposited on the surface, the rock cooled, contracted & compressed into the familiar stacked-column formation.

 

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Uploaded on August 26, 2015
Taken on August 26, 2014