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Division of the Earth's history into nested time periods consisting of eons that consist of eras that consist of periods that consist of epochs.
A supereon is broken up into separate eons, that is, which represent the largest of the time sub-intervals making up Earth's history. Overall there are three such eons that consist, going from oldest to youngest, of the Archaean eon, the Proterozoic eon, and Phanerozoic eon. See also geological time scale.
Though these different intervals represent very much a geological record, in fact the geological record was built, particularly for the last half a billion or so years, primarily in terms of the fossil record.
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