Devils Tower National Monument, Wyoming (Illustrated)
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Devils Tower is a steep-sided mass of igneous rock that rises above the surrounding hills and the valley of the Belle Fourche River in Crook County, Wyo. It is composed of a crystalline rock, classified as phonolite porphyry, that when fresh is gray but which weathers to green or brown. Vertical joints divide the rock mass into polygonal columns that extend from just above the base to the top of the Tower.
The hills in the vicinity and at the base of the Tower are composed of red, yellow, g...
The hills in the vicinity and at the base of the Tower are composed of red, yellow, g...



