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karissatkka: 1 year ago

Why do periods make up eras?

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dondayan: 1 year ago via iPhone

The largest defined unit of time is the supereon, composed of eons. Eons are divided into eras, which are in turn divided into periods, epochs and ages. The terms eonothem, erathem, system, series, and stage are used to refer to the layers of rock that correspond to these periods of geologic time.

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