This was the time when the great Ice Ages began to bite, for the first time actually feeling like a real climate disaster. The chaos had begun millions of years before, though only now have the Ice Caps took on their characteristic appearance. Spreading slowly from the Poles, Ice Caps advanced over the land, and absorbed much of the moisture into the thick layers of Ice. A a result, the previously steaming jungles, were dried out of existence, and were pushed back to the tropics, where we known them to be today. The great animals that had thrived in the warm, damp conditions, perished in many numbers, and were replaced by those that were better suited to living on the now dominant new plant species; the grass. In the seas, the largest predatory shark of all time, Megalodon, hunted whales, biting their tails off to drown them, then later finishing them.
The Precambrian Super-Eon The Hadean Eon The Archaean Eon The Proterozoic Eon The Phanerozoic Eon The Palaeozoic Era The Cambrian Period The Ordovician Period The Silurian Period The Devonian Period The Carboniferous Period The Permian Period The Mesozoic Era The Triassic Period The Jurassic Period The Cretaceous Period The Cenozoic Era The Tertiary Period The Palaeocene Epoch The Eocene Epoch The Oligocene Epoch The Miocene Epoch The Pliocene Epoch The Quaternary Period The Pleistocene Epoch The Holocene Epoch