During the Paleogene period85, about 65.5 million years ago, the domination of the mammals would commence. This period would be separated into the Paleocene, the Eocene and the Oligocene eras. About 58 million years ago, many species of archaic mammals appeared that would evolve continuously and mutate into the present-day mammals but also into the primitive cetacean marine mammals. The climate was tropical while modern-day plants and families of primates followed after the extinction of the dinosaurs. The first large mammals appeared about 56 to 34 million years ago. Modern-day blooming plants spread across the Earth, attracting insects with them, while the process of the creation of the European and Asian mountain ranges would begin.
During the Paleocene era, about 65 to 55 million year
