I question the idea that the ice sheets expanded from what we now call the Arctic and Antarctic. The existence of tropical forests under the miles of ice sheets might mean that those areas were part of the ‘tropics’ along the equator and Canada/North America might have been the ‘south pole’.
UCANSEE2: “The existence of tropical forests under the miles of ice sheets might mean that those areas were part of the ‘tropics’ along the equator and Canada/North America might have been the ‘south pole’.”
Remember, the time frame for “snow ball Earth” was hundreds of millions of years BEFORE there were any forests, or other complex life of any kind.
We’re talking about Stromatilites and Algae under all that ice, not forests or critters.