[GourmetDan]

"Most of the domesticated plants that occurr in the equatorial areas of the world cannot be grown in northern or southern latitudes, so farmers would have been unlikey to migrate unless forced to do so by a catastrohpe, such as rapidly rising sea levels."

Must have been Democrats. Why else move to a whole 'nother latitude instead of just to higher ground?

[SatinDoll]

When the Ice Age ended, the eventual rise in sea level between 15,000 years ago to 7,500 years ago was about 300 feet and even higher in some areas, up to 400 feet.

The North American ice sheet collapsed at one point, possibly due to a bolide strike in the area of present day great lake Michigan around 13,000 years ago. (There is also an impact crater on the the bottom of great lake Ontario, though I don’t know the age). The amount of fresh water that flooded out of Hudson’s Bay was enormous.

“From every existing river and stream, frigid freshwater flooded into the Atlantic, Pacific, and Artic Oceans. The sudden pulse of melted ice caused sea levels to rise many feet within a few weeks...Relentlessly, day by day, thousands then millions of square miles of once verdant grasslands and forests slipped beneath the rising ocean waves...” This is an excerpt from p.144-145, The Cycle of Cosmic Catastrophes, by Richard Firestone, Allen West, and Simon Warwick-Smith (2006).