The descriptions of massive bone yards appear in some of Velikovsky’s writings. I also have a book titled “My Way Was North” in which the author describes a cliff face (I think in Alaska) packed solid with bones being eroded out. Unfortunely it is packed away so I can’t give the more precise information and quote. They were bones of the type appropriate for a 13,000 bc disaster. I could imagine giant tsunamis causing such bone piles.
Maybe Denisovians?
"The enigma of Kow Swamp is that the skulls are younger than those at Keilor and Willandra Lakes, but appear much more archaic. The people at Kow Swamp had large, long heads with very thick bone, up to 13 mm thick. Their faces were large, wide and projecting, with prominent brow ridges and flat, receding foreheads. From above they show a pronounced inward curvature behind the eye sockets, giving the skull the appearance of a flask. They had enormous teeth and jaws, some even larger than Java Man, Homo erectus (Previously called Pithecanthropus, from the middle Pleistocene of Sangiran."
Truth be told, it's the only thing that comes to mind that COULD explain it. Depositing the bones of millions of disarticulated animals along with splintered trees, volcanic ash, large rocks and sand over hundreds, maybe thousands of miles is tough to overlook but the scientific community™ has done a yeoman's job of it so far. Gives me a case of the RED A$$!
Parenthetically, and re your other post: From many accounts the Smithsonian has been complicit it hiding and/or losing evidence that doesn't fit the uniformitarian or other "consensus" narrative. Such and august institution guilty of fudging the facts??? Say it ain't so...