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)
Return to Geology of Devils Tower Main Index (Alt + I)
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Glossary (Alt + G)
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Teacher Resource Center for Devils Tower (Alt + R)

Three sedimentary rock layers are exposed at Devils Tower National Monument: the Spearfish Formation, the Gypsum Springs Formation, and the Sundance Formation. When you visit Devils Tower National Monument, you can see these layers by hiking along the Red Beds Trail. View them now by selecting a panorama taken from this trail.

In the photo select the names of the three layers in turn. You should start at the bottom with the Spearfish Formation and work your way to the top. Remember that older sedimentary rocks lie beneath younger sedimentary rocks.

Spearfish formation
Gypsum Springs Formation
Sundance Formation