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Low water levels on the Presque Isle River where it flow through the Porcupine Mountains Wilderness State Park exposes the nonesuch shale riverbed.
MIMichiganUpper PeninsulaOntonagon CountySilver CityPorcupine Mountain Wilderness State ParkMichigan State ParkPresque Isle Rivernonesuch shalenaturescenicfallautumnOctoberUnited StatesNorth America
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