That's some good additional information, but the real news is from a couple of years ago in Kemp's sequencing of the D4h3 haplotype from On Your Knees Cave. That partial skeleton was dated to 10,300 years ago.
And the D4h3 haplotype was found along the west coast of both North and South America, all the way to the southern tip.
That's the best evidence so far for the early coastal migration.
From my own work, it looks like a subdivision of the A1 haplotype also will tie in to that early coastal migration.
Exciting times to be doing archaeology!
Thanks CM.