Geologic ages of earth history/Definition

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https://en.citizendium.org/wiki/index.php?title=Geologic_ages_of_earth_history/Definition&printable=yes
A definition or brief description of Geologic ages of earth history.

Measurement of the geologic history of the earth which can be broadly classified into two periods: the Precambrian supereon and the Phanerozoic eon.

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