Coal Vein Trail Post 4: Caprocks
in
Theodore Roosevelt
Rocks in the badlands are generally soft and easily eroded by rain and streams. Some are harder than others, and become caprocks. A caprock acts like a helmet, shielding softer rock underneath. When the rocks underneath finally erode away, large pieces of caprock break off and fall. The large pieces of sandstone behind you were once caprocks at the top of the hill. 

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