it does seem though someone always challenges the dates in such things. The truly old dates seem to come from when the site was first used. It was unclear how well they can correlate that first use with those amazing structures. Even the youngest dates though are very old.

It almost seems impossible that hunter gather societies could get the man power and organization in place build something that big. They must have been in the area for an extended amount of time to build this. It will be interesting to see what they find if they ever find the camps they must have been staying in when they built it. I think that would tell us a lot.