[Almondjoy]

Isn't there a theory that the Earth can actually switch the position of it's axis?

If that's true that would explain this as well since the North Pole wouldn't of been the North Pole at that particular time.

That being said the axis shift theory probably happened a lot longer than 55 million years ago.

[Mike Darancette]

Isn't there a theory that the Earth can actually switch the position of it's axis?

The Sun Rising In The West, Polarity Reversals, Oral Histories and Science

Yes there are but you have to remember that the globe rotating on it's axis acts like a huge gyroscope hence it would be hard to physically flip.