20,000 years ago, there were rocky cliffs on the South Carolina coast

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The cliffs are still there but today they 66 miles to the east of the modern coastline and about 200 yards under water. Sea level has risen that much.

Scientists from the College of Charleston think colonies of walruses and seals lived on these cliffs which are called Bulls Scarp. Bulls Scarp jutted out into the ocean.

The researchers also think this will be a good place to look for paleo-indian artifacts. Bulls Scarp offered many resources such as marine mammals, fish, shellfish, sea birds and eggs, rock shelters, stone for tool-making, and freshwater springs.

There's a really cool sonar image of the structure.