4Huge natural, stone “cannonballs”

Theodore Roosevelt National Park, North Dakota

The Cannonball Concretions appear to be gigantic cannonballs. They are composed of clay, shale, sandstone, and various mineral compounds. Their numbers multiply as they are unearthed by erosion which wears away their natural protective shields.

They can be found right off the paved road in the less-visited north district. Set up camp in the highly praised Juniper Campground. Then cross the park’s road to check out the cannonballs.

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