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The Paleogene Period
The Paleogene Period has three epochs: Paleocene, Eocene, and Oligocene.
Paleocene
Oligocene
Eocene
The Paleocene Epoch is the first epoch of the Paleogene Period. At the beginning, which was 65.5 mya, dinosaurs, ammonoids, and many land plants went extinct. There were dense forests being filled with new mammals and birds. India, which was an island, moved North and collided with Asia. At the end of this epoch, the climate became wetter and caused a sea level rise due to increase in temperature.
The Eocene Epoch is the second epoch of the Paleogene Period starting 55.8 mya. It started extremely hot, much like global warming. It was so hot that trees and even forests grew in the polar regions. Later on, it became cooler and drier. India was still moving North, pushing up against the Eurasian continent and forming the Himalayas. There were many modern groups of mammals such as lemurs, bears, dogs, rhinos, hares, rabbits, and more.
The Oligocene Epoch is the third and last epoch in the Paleogene Period. It started 33.9 mya and saw the start of global cooling. Grasslands expanded and forests (mostly tropical) shrank. The new landscape caused animals to evolve. Fast running prey and predators increased in number.
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