Overview of Devils Tower geology (Alt + 1)
Sedimentary Rocks (Alt + 2)
Igneous Rocks (Alt + 3)
Erosion (Alt + 4)
Review of Devils Tower geology (Alt + 5)
Help and Information Center (Alt + H)
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Glossary (Alt + G)
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Devils Tower in Wyoming is on the northwestern flank of the Black Hills–Bear Lodge uplift, a mountainous region in western South Dakota and northeastern Wyoming. This uplifted area, along with the Powder River Basin, formed about 60 million years ago during the Laramide Orogeny. The Laramide Orogeny formed many of the present-day Rocky Mountain ranges: the Bighorn Mountains and Wind River Range in Wyoming, the Front Range in Colorado, and the Uinta Mountains in Utah.

Explore the sequence of geologic events that created and exposed Devils Tower, then take a geologic tour of the nation’s first national monument.