All right, Sunken Civ, time to post that Firestone, et al book again.
BTW, I've read the book. VERY good read even if it does get a little sciency at times. Alls I know is something REALLY BIG happened ~13,000 years ago.
The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization
by Richard Firestone,
Allen West, and
Simon Warwick-Smith