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Irregular Columnar Jointing, North Cascades, Washington

Irregular columnar jointing, called entablature, is visible on an exposed hillside near Artist Point in the North Cascades of Washington state. These types of rock columns are formed when volcanic rocks cool, contract and crack.

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Irregular columnar jointing, called entablature, is visible on an exposed hillside near Artist Point in the North Cascades of Washington state. These types of rock columns are formed when volcanic rocks cool, contract and crack.