To find anything that has been cold for that long you almost have to leave Earth. Even Antarctica was tropical 65 million years ago. I suppose when they start to study the chemistry of the ices in the outer solar system they will find out how long spans of time causes change in the cold.
It just seems like this skin might not be as old as they theorize. Perhaps, not nearly as old.
We have tropical plant and animal fossils from millions of years ago - but no modern species.
How does a young Earth creationist explain why we find tropical species from millions of years ago on Antarctica - but nothing that would be described as a modern species other than Penguins and such?