South American monkeys, apes in southern Europe, Ramapithecus. Eocene 58-37 mya Mammals abound. Primitive whales appear . Paleocene 65-58 mya First large mammals and primitive primates, plesiadapiforms . 98- 65 mya High tectonic and volcanic activity.
Primitive marsupials develop.
Continents have a modern-day look. Minor extinction 82 mya. Lower 146-98 mya The heyday of the dinosaurs. The first crocodilians, and feathered dinosaurs appear. Minor extinctions at 144 and 120 mya.