If you could stand on today’s Mackinac Island shoreline near Mission Point Resort 10,000 years ago, you wouldn’t be looking across Lake Huron. You’d be looking down into a deep river valley, where a roaring glacial meltwater river would be approaching the edge of a 100-foot waterfall. The land that makes up the island would be familiar. The same hard Mackinac Breccia that forms Arch Rock, Sugar Loaf and the island’s cliffs today would still be t…
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