Geology Along the Lewis & Clark Trail

Geologic Points of Interest

Up the Missouri

As the Corps of Discovery progressed up the Missouri River they passed through along the northern flank of the Ozark Dome and across the backbone of the North American continent where sedimentary rocks are very thin. As they approached Ft. Mandan they entered the Williston Basin, known for its oil production (geology relief from USGS Time and Terrain).

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