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Geological Time - Cenozoic Era

The Age of Birds and Mammals

The Cenozoic Era marked the end of the dinosaurs and the emergence of mammals and birds. Although primitive mammals and birds first appeared in the Mesozoic era, it was not until the Cenozoic Era that they really emerged as powers in the world. Please click colored blocks for more information.

The Cenozoic Era is divided into two major periods.

  • The Tertiary Period, starting 65 million years ago, saw the end of the dinosaurs and the great rise of mammals and birds to take the place of the dinosaurs. Many of the creatures from the Tertiary Period are direct ancestors of modern species.
  • The Quaternary Period, which began just 2 million years ago, marked the origin of humans as well as the modern forms of the animals we see today.
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