One of the most spectacular natural creation, the Devils Tower (also called Mato Tipila, which means “Bear Lodge”), is a monolithic igneous intrusion of volcanic rock located in the Black Hillsin Crook County, northeastern Wyoming, above the Belle Fourche River. It rises dramatically 386 meter above the surrounding terrain and the summit is 1,558 meter above sea level.
Geologists believe that the tower is the eroded remains of a large mass of igneous rock poking through a layer of overlying sedimentary rock beds. As rain and snow continue to erode the sedimentary rocks surrounding the Tower's base, more of Devils Tower will be exposed.
The tower itself has been eroded over the ages. Portions, or even entire columns, of rock at Devils Tower are continually breaking off and falling. Piles of broken columns, boulders, small rocks, and stones lie at the base of the tower, indicating that it was once wider than it is today.
Source: Wikipedia
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