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Laurentide Ice Sheet

The Laurentide Ice Sheet was a massive sheet of ice that covered millions of square miles, including most of Canada and a large portion of the Northern United States, multiple times during the Quaternary glacial epochs, from 2.58 million years ago... Wikipedia
Location: Canadian Shield
Lowest elevation: Sea level
Terminus: North – Arctic Ocean; East – Baffin Bay; South – 40 degrees north latitude; West – Rocky Mountains