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Paleozoic era begins
570 million years ago -
Worlds oldest rocks form on earth
4400 million years ago -
Mesozoic era begins
248 million years ago -
plants take root on the earth
430 million years ago -
150 million years ago
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Dinosuars suffer a massive extinction
65 million years ago -
Cenozoic period begins
63 million years ago -
after the sudden extinction of Dinosaurs, mammals begin to walk the earth
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Ice age begins
the most recent Ice age ended 10,000 years ago