Geology Along the Lewis & Clark Trail

Geologic Points of Interest

Down the Ohio

On his trip down the Ohio, Lewis, and later Clark, passed from the gently folded rocks of the Appalachian Basin, through the older Ordovician limestones of the Cincinnati Arch, into the Illinois Basin to the mouth of the Ohio, and then to Camp Dubois (geology relief from USGS Time and Terrain).

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Ohio

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