When I was an undergrad, I had to take some sort of social science (to go with the geology, chemistry, physics, and biology), so I took courses in Archaeology which would satisfy both that requirement and my own interests. In the North American Archaeology course, my professor (a 'heretic' by 1970s standards) claimed it was quite likely that humans had been migrating to the Americas for closer to 32,000 years than the standard 'Clovis is first" dogma would allow. I found that fascinating, as my grandfather had found a very large stone axe (Which was borrowed for study at the Smithsonian, and disappeared) while excavating footings for an air warden/spotter tower in Southern Maryland along the river. The area was known to the locals for artifacts from the Archaic and Woodland eras, and possibly earlier, and would have been high ground, less than a mile inland from the rivers during the ice age, before the sea level rose during the thaw and formed the drowned river valley estuaries of the Lower Potomac, Chesapeake Bay, James, and Rappahannock Rivers, to name a few. Earlier migrations may have fanned out across North America, but certainly, some migrated South into Central and South America.
More and more, evidence is emerging to prove his long ago speculations correct.
