However you are forgetting about continental drift. 100M - 200M years ago there was much more land concentrated at the poles (where the climate would have been

However you are forgetting about continental drift. 100M - 200M years ago there was much more land concentrated at the poles (where the climate would have been more amenable to life) - https://www.theatlantic.com/technology/archive/2013/09/what-did-the-continents-look-like-millions-of-years-ago/279892/ https://www.theatlantic.com/technology/archive/2013/09/what-...