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15 March, 00:01

What are geologic time periods divided up by?

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  1. 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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