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How long is an eon in geologic time?

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How long is an eon in geologic time?

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An eon, which is the longest unit of geologic time, is roughly one billion years long. The geologic time scale currently has four named eons: Hadeon, Archeon, Proterozoic, and Phanerozoic. Eons are further broken down into eras, which are further divided into periods. Periods are divided into epochs and epochs are divided even further into ages.