Overview of Devils Tower geology (Alt + 1)
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Erosion (Alt + 4)
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About the time the rocks of the tower cooled, the Rocky Mountains had already formed, during a mountain-building event called the Laramide Orogeny.

Locally, the Laramide Orogeny created the Black Hills and Bear Lodge Mountains.

The Powder River Basin that lies to the west between Devils Tower and the Bighorn Mountains was dropped down to form a lower lying area.

Shifting sediment into nearby basins
Regional uplift