American Indians were so isolated in the New World and cut off,unlike the Old World,from the cultural and technological traffic the made Western Civilization the most efficacious and powerful global community in the world- even to this day.
The proof of an astronomical observatory to mark the seasons designed and built in the environment of 12000 BC Virginia would be earth shaking news and mark an era in pre-historic America to rival the placement of the standing stones of Stone Henge.
And more than twice as old as stonehenge.