[gleeaikin]

Here is another early, not prehistoric, since it is early 1500s recent discovery. Near Ontario, it was the biggest settlement in the northern northern hemisphere at that time. I would have sent the Huff Post link that had a lot more info, but found this link at a scientific site and figured it was more PC. ;-)

http://www.livescience.com/21351-mantle-site-artifacts.html

[SunkenCiv]

Good choice! :’)