Having watched the second one first just now… Nice aerial film. This is good stuff for mutiples. They aren’t big enough to have done anything the size or duration of the YD stadial, but might have been part of the swarm nevertheless. The big impactor is still out there somewhere. (I am not ruling out the Lake Chicago impact in southern Lake Michigan. Someone DOES need to check it out. Where is Jacque Cousteau when you need him?) Cuitzeo, the lake in central Mexico, is pronounced kwit-SAY-oh. I was riding over Lake Cuitzeo two weeks ago, and wondering where the sample site is. It is very near the land bridge I was on, just to the east. The Lake Agassiz sudden emptying hypothesis he has is a different take on Wally Broeker’s. It definitely did not, however, empty down the St Lawrence as his graphic implied. It also could not have emptied via Hudson Bay, since that was under even more ice than the Great Lakes were (so much that Charles Hapgood thought it was the last North Pole before a crustal shift). The Mackenzie River emptying would not have affected the Atlantic; Rodney points out that the Arctic Ocean currents would have taken the fresh water westward, away from the Atlantic conveyor everyone tries to blame for the climate change in the YD stadial. What they need to do is get rid of the oceanic conveyor shutdown once and for all. It didn’t happen. And, not having happened, could not have caused any of the things suggested.