The bedrock of the park consists primarily of Ordovician Period Rocks, as well as Lorraine, Trenton, and Black River Group, which can be seen in the dolomite and limestone shoreline. Other rocks in the park include siltstones, sandstones, and shale.[11] Areas on the Snakefoot trail offer a good example of the limestone shelves on the shoreline of the park, as well as the limestone cliffs.