Stones on the shore of Lake Superior. The last glacier, about 10,000 years ago, left behind these granites, schists, and gneiss. They came from northern Canada and the Canadian Shield, a 1.5 billion year old formation.
If you look at the Canadian shield on Google Earth, especially east of Hudson Bay, you can see large impact craters that appear as circular lakes. Hudson Bay itself may be an impact structure!
If you look at the Canadian shield on Google Earth, especially east of Hudson Bay, you can see large impact craters that appear as circular lakes. Hudson Bay itself may be an impact structure!
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