Miocene 24-5 mya More mammals, including the horses, dogs and bears. South American monkeys, apes in southern Europe, Ramapithecus. Eocene 54-38 mya Mammals abound. Primitive whales appear . Paleocene 65-54 mya First large mammals and primitive primates, plesiadapiforms .
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.