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Robin
Biology
15 March, 00:01
What are geologic time periods divided up by?
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Elliot Waller
15 March, 00:28
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Eons are divided into smaller time intervals known as eras. In the time scale above you can see that the Phanerozoic is divided into three eras: Cenozoic, Mesozoic and Paleozoic. Very significant events in Earth's history are used to determine the boundaries of the eras.
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