I Googled and first entered “Argentine Impact Craters” where there are a number of interesting listings. I determined that the one I had noticed before was the Campo del Cielo field, so added that to the first title. Here is one of the articles posted there. It seems that testing of burned wood samples under meteorites gives an age of 2200 to 2700 BC, which is about right for Ipuwer’s time.
Have fun checking out these sites, and they also have material related to other parts of South America.
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