Explore / North America / North Dakota
North Dakota
Cannonball concretions, Grant County
Mineral locality Documented sitePermission required
What you could find
Reported finds from this ground.
Crystals and mineralsAlso reported: cannonball concretions, sandstone spheres.
Photos via Wikimedia Commons: Stephanie Clifford from Arlington, VA, USA (CC BY 2.0).
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Why this spot
Huge spherical sandstone concretions weathering from Paleocene bluffs along the Cannonball drainage
The cannonball concretions are a documented North Dakota curiosity.
Keep exploring nearby
More spots in this area.