Cannonball Concretions Pullout

"Mountaineers might be used to rocks of every shape and size, but for many of us, stones are not naturally perfectly round — the compacted and condensed sedimentary material forms early. Many years later, the rocks emerge as geological curiosities in spheres and rounded shapes. The Cannonball Concretions in North Dakota aren’t the only concretions in the world, but they are a part of the wonder of Theodore Roosevelt National Park. Visitors can spend time in the space our former president adventured, watch baby bison play, and visit these odd spherical wonders that still attract much attention and awe."