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Arched rock is a natural limestone arch formed during the Nipissing post-glacial period, a period of high Lake Huron levels following the end of the Wisconsin glaciation. Arch Rock stands on the Lake Huron shoreline 146 feet above the water.

Arched Rock

Arched rock is a natural limestone arch formed during the Nipissing post-glacial period, a period of…

Sugar Loaf is a 75-foot-high landlocked rock or stack in the interior of Mackinac Island in Lake Huron. Created by erosion during the period of postglacial Lake Algonquin, Sugar Loaf is the largest post-glacial erosion feature in the Straits of Mackinac.

Sugar Loaf Rock

Sugar Loaf is a 75-foot-high landlocked rock or stack in the interior of Mackinac Island in Lake Huron.…