What an odd way to mention Adovasio. He was a professor at Mercyhurst and hasn’t been at Pitt for many years (didn’t leave under happy circumstances). I’ve never met him but I did take a tour of Meadowcroft rock shelter.
BTW - IMO Meadowcroft’s artifacts might be evidence of non-homo sapiens in ancient America (maybe Homo erectus?). The stone tools are very crude.
His book on the various crises of what paases for precolumbian north American archaeology is well worth reading.