Andami, on 02 August 2012 - 10:24 PM, said:
Edit: I actually take that back. Apparently the continents were near their current positions 55 mya. My bad.
Well; yeah I was about to say the same....

and its hinted at in the article;
"The research found winters were an “extremely mild” 10C, with warm summer temperatures up to 21C, and were “essentially frost-free despite polar darkness”.