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M 128 Bowl-shaped erosion patterns worn in the riverbed of the Presque Isle River, Porcupine Mountains Wilerness State Park, Michigan.
MIMichiganUpper PeninsulaOntonagon CountySilver CityPorcupine Mountain Wilderness State ParkMichigan State ParkPresque Isle RivernaturescenicfallautumnOctoberUnited StatesNorth America
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