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How do periods relate to eras?

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Anonymous

13y ago
Updated: 8/20/2019

Eras are longer than, and made up of, periods, in the same way that decades are longer than and made up of years. For example, the Mesozoic era is made up of the Triassic, Jurassic and Cretaceous periods, in the same way that the 1990s is made up of 1990, 1991, 1992, 1993... etc.

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Wiki User

13y ago

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