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)
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Sedimentary rocks are deposited in layers, usually underwater, with the oldest layers on the bottom and the youngest layers on the top.

Sandstones tend to be harder and more resistant than mudstones. Hence, sandstones usually form cliffs and ledges, and mudstones typically form soft, crumbly slopes.

To further explore sedimentary rocks and processes, proceed to the classroom activity.

Sediment grain sizes