EOCENE EPOCH |
When the Eocene Epoch started off, most of the word was covered in rainforest, with palms being found as far north as Alaska and giant redwoods being found in the Arctic.
Tropical rainforest spread as far up as North America and Europe, and all of Antarctica was rainforest. (To be fair, Antarctica had yet to shift as far south as it is today.)
As the Eocene Epoch aged on, the climate cooled rapidly, and deciduous forest overtook rainforest in northerly areas. Grasses, having evolved in the Cretaceous Period, were still confined to riverbanks, and had not yet spread into plains and savannahs.