...the FACT that in recent history, within 4,500 years or so,...
And in combination with that the following carcasses were said to be found within the Arctic Circle...
a fact proven by the huge amount of animal carcasses; elephants, rino's, hippo's, tigers, wolf, fox etc. discovered throughout the region in that last century...
Got a source for that?
Not for something in the last 4500 years, just for long before then.