I never did buy the ‘Land Bridge’ theory.
I bet humans came from all directions and modes of transport to settle in new lands.
Across the north and south Atlantic in boats, rafts etc.
The could have come by foot when the northern hemisphere was frozen under a mile of ice......................
I accept the Beringia route, but I don’t accept it as one time thing, or as a one-way street. And I wholeheartedly agree, just like the rest of the planet, people came in from all different directions at different times.
There was a PBS show years ago, “Lost Red Paint People” (hmm, probably it’s been uploaded to one of the vid sites) which was I think also mentioned how the small megaliths (oxymoron alert) they’d erected were the same as those found in the European and Asian Arctic Circle. Of course, the show throws monkey crap all over the idea that anyone could possibly have crossed open water.
Which is weird, because people have crossed the same batches of open water, reaching at least Greenland from the west, repeatedly over thousands of years.
Anyway, some links that are half-assed related:
https://journals.uair.arizona.edu/index.php/radiocarbon/article/viewFile/994/999
This book looks interesting:
http://books.google.com/books?id=IE6cAgAAQBAJ&dq=first+migrants&source=gbs_navlinks_s
http://www.freerepublic.com/tag/maritimearchaic/index
http://www.freerepublic.com/tag/redpaintpeople/index