I have never been to the site, but I have seen some of the tools and several presentations on the data. The tools I saw were unquestionably of deliberate manufacture, not accidental from soil movement.
Don't know what to make of the early age claims yet. I have been following this for years, and am still not sure.
I like to keep in mind Clarke's First Law:
When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.But, I also have to remember Isaac Asimov's Corollary to Clarke's First Law:
When, however, the lay public rallies round an idea that is denounced by distinguished but elderly scientists and supports that idea with great fervor and emotion — the distinguished but elderly scientists are then, after all, probably right.http://en.wikipedia.org/wiki/Clarke's_three_laws
Ditto.
This is one of the areas where George Carter gathered what came to be known as 'cartifacts.'
George also said that the Naval Observatory and part of San Diego University was built on one of these early sites too.