Here we report a study in which geometric morphometrics and multivariate statistics were used to compare the shapes of the blades of Clovis, Folsom and Plainview points from the Southern Plains of North America.
Blade shape features in the type definitions of Clovis, Folsom, and Plainview projectile points.
However, the accuracy of these assessments has never been evaluated.
The dating of land surfaces has long posed problems for geomorphologists.
Relative methods (stratigraphic, geomorphic, topographic) are sound and convincing.
Absolute age determinations must be consistent with the stratigraphic and geomorphologic settings.
The best results are obtained when physicists and earth scientists pool their knowledge and experience.Individually, however, the studies point to diverse conclusions.For example, two studies reconstructed haplotypes in introns of X chromosome-linked genes, using chromosomes drawn from many populations around the world.I’ve observed that the 60k OOA date is a non-starter based on the arrival of people in Australia ( with TL dates of 55-60k); a pre Toba date is supported for the OOA.I’m still a bit curious why so many seems insistent on a more recent date.There are modern human sites in Israel dating from 120k (Skhul) to 100k.