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Visit Cannonball Concretions Pullout, Theodore Roosevelt National Park, North Dakota
Cannonball Concretions Pullout is located along the North Unit Scenic Drive in Theodore Roosevelt National Park. This boulder is known as a "concretion". The concretions are formed within sedementary rocks such as shale or sandstone. They form as minerals are deposited around a core. As the surrounding rocks erode, the "cannon balls" become exposed.
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