Thanks g.
http://www.freerepublic.com/focus/fr/601395/posts
http://www.freerepublic.com/focus/chat/731502/posts
http://www.freerepublic.com/focus/news/744698/posts
http://www.freerepublic.com/focus/news/1994235/posts
I looked at the 4th post listed, which was from 2008, and saw your comment #49 which mentions an event 10,000 years ago. There is also an event from 10,000 years ago mentioned for Argentina, Rio Cuarto I think. You have already posted in the past about the 2 mile wide crater in the Iraq Marshes which was around 2,000 BC. As we know from the Shoemaker/Levy event recently on Jupiter, it is quite possible that there were multiply events worldwide for both these time periods. Now back to the other 3 posts (after lunch ;-) ).