zonein  TIMELINE

Archean Eon

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Period Subdivision Timespan
Archean Eon Eoarchean 4000 to 3600 million years ago
Paleoarchean 3600 to 3200 million years ago
Mesoarchean 3200 to 2800 million years ago
Neoarchean 2,800 to 2,500 million years ago