I believe you have a point, but their claim about the fossil record makes it too sudden for continental drift to be the major cause.
But golly gee this pretty much proves that Global Warming as a human caused effect is a environmental extremist fantasy.
Yes, I agree, but a change in ocean currents could also bring about such a change, and if located at some distance from the pole, it wouldn't have to be quite as dramatic.
Well, it turns out that 55 million years ago the Arctic ocean and the underlying crust was just about where it is now. 55 million years isn't so long in the geologic scheme of things.
So, I'm going over to the wobble school and the solar variation hypothesis.
Otherwise, I have to go with the dinosaur SUV hypothesis, and I don't want to be forced to go there!