related, regarding 3100 BC:
Archaeologists push back beginning of civilization in Americas 400 years
The Daily Telegraph | Dec. 23, 2004 | Nic Fleming
Posted on 12/22/2004 6:09:11 PM PST by bruinbirdman
http://www.freerepublic.com/focus/news/1306976/posts
also related:
Human settlements far older than suspected discovered in South America.
DISCOVER Vol. 23 No. 5 (May 2002) | (May 2002) | By John Dorfman
Posted on 04/21/2002 5:41:59 PM PDT by vannrox
http://www.freerepublic.com/focus/news/670296/posts