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What are geologic time periods divided up by?
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What are geologic time periods divided up by?

User Aresvik
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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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User Florian Ajir
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