Eon in planet Earth's geological record lasting from ~540 million years ago to the present.
Making up the Phanerozoic eon are three eras:
So much happened during the Phanerozoic eon in terms of the evolution of life, i.a., as over the last approximately half-billion years, that it is best considered on a per-era and, indeed, per-period (as can be seen by following the above links).
The Phanerozoic eon is preceded by the Proterozoic eon.
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