[palmer]

What they won't tell you is that the land around and under the great lakes is still "rebounding" from the weight of the glacial ice sheet that covered the region during the last ice age, roughly 12,000 years ago.

Quite true. The Great Lakes used to be part of glacial Lake Agassiz and most rivers north of Arkansas drained northward.

[citizen]

Very interesting. I knew the Great Lakes were carved or otherwise formed by the great glacial activity but I had not heard of the rebounding theory.

Wasn’t there have supposed to have been a great filling (or refilling) of the Mediterranean Sea, the Black Sea and I suppose many other ancient basins?