Not very long ago, the Northern Hemisphere was smothered by ice and the sea level was 400 feet lower than it is today. Right now, far offshore at the bottom of the Atlantic Ocean, sea robins and cod tend to mastodon and woolly mammoth graveyards. Their tusks are pulled up by scallop dredgers on George’s Bank and in the Gulf of Maine. Though they’re found at the bottom of the ocean, these were not amphibious mammoths. Instead, they roamed a vast coastal plain on what was dry Atlantic continental shelf before the great ice sheets melted and raised the seas hundreds of feet. Underwater canyons
...more
