You might point me to where I can study the remaining megafauna in Europe and Asia, excepting the Asian subcontinent where elephants still roam. As far as I can tell, Australia, with the exception of some overly large marsupials, never had much else in the way of megafauna to start with. A quick search indicates there were mammoths/mastodons on the African continent at one time. I didn't look any further to determine when they went missing. NZ and Madagascar???
There are so many anamolies associated with this time period that trying to put the blame on humans seems a PC endeavor at best and unmitigated propoganda at worst. There are indications of potential cosmic origin, along with pole wanderings, massive volcanism, flooding and enormous waves traversing entire continents; you get the idea...
From this SEARCH check out the first ARTICLE re boneyards in Alaska and almost complete islands composed of mammoth/mastodon remains in and north of Siberia.
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.