Thanks. I have looked a a few of the glaciation min/max maps, and amongst other things, a large part of the Gulf of Mexico was once dry land. The western shelf of Florida and the Yucatan were particularly large chunks. Like some others, I believe much/most of our history is under several hundred feet of water.
FGS
"a large part of the Gulf of Mexico was once dry land. The western shelf of Florida and the Yucatan were particularly large chunks." I've gone so far as to speculate that the Gulf Of Mexico was blocked off from the world's oceans during the Ice Age...and, at some point reflooded, like the Black Sea.