Per the Biblical account and research by Dr. Walt Brown permafrost is basically a direct result of the global flood in Noah’s day approx 3,500 years ago when many kinds or animals were buried in the arctic circle. His research began when he was teaching evolution and found so many lies and logical inconsistencies with the evolution theory.
http://www.creationscience.com/onlinebook/FrozenMammoths3.html
Nonsense. Telling lies like this does not help support for Christianity and Judiasm. The truth about the Earth's geologic history is completely consistent with biblical teachings. No need to invent fairy tales.
Actually it was comet strikes in 10,800 BC which killed the mega-fauna and burned North America - lasted over 100 years, leaving a foot thick black mat of incinerated vegetable, animal and human matter, ushering in the Younger Dryas Period lasting 1000 years before another strike cause its end and brought the worldwide Flood you mention raising sea level 400-700 feet.