TIL about the Hartley Mammoth butchery site, 37kybp in New Mexico, via offhand mention in the paper. It will be hard for naysayers to discount it, given so many details seen almost exclusively in human contexts.
Of course there would be no detectable linguistic remnants of these people after so long, so their place in the landscape of migrations may never be established.
The most interesting secondary information I got from this vid is that there are dozens of mammoth sites in North America that have not been excavated because they are considered too old to be potential human cultural sites, or because no interesting stone tools were found.
The next was that the butchers of this mammoth lacked the sophisticated stone tool technology later migrations brought in. Thus, not finding stone tools does not disqualify a site as cultural. Apparently the stone tool technology was not known to the south Asian maritime population that first settled the Americas, but was brought in by the Siberian overland population.
Of course there would be no detectable linguistic remnants of these people after so long, so their place in the landscape of migrations may never be established.