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one after another over seven long Eras of "days."
Also, the Phanerozoic can be split up into 3 eras: Cenozoic, Mesozoic, Paleozoic - like in your image.So why is Archean not split up into Neoarchean, Mesoarchean, Paleoarchean and Eoarchean also?
Edited by Panda,
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