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My sources came from a paper written by Andy Mayhew, which i have read.
I've also read the reports of most of the sources he listed.
The idea of tropical vegetation came from VonDaniken and was parroted by Hancock in "Fingerprints of the Gods."
No mammoths were "flash frozen" anywhere. Most of them show marks of predation. How does a wolf chew through hard-frozen mammoth?