One of the coolest and most underappreciated things about the area around the lodge are the rocks of the Gunflint Formation. They are a breccia that was put in place 1.8 billion years ago when an asteroid hit the east end of Lake Superior. The impact and resulting tsunami broke apart the existing banded iron formation and mixed the chunks all up.
There's a good sized boulder of it on the beach, and all the rocks making up the fireplace in the main lodge are made of it. You can see the individual chunks of rock that were broken up.
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