Eon, largest geologic time unit, Era, below eon, above period, Period, below era, above epoch, Epoch, smallest listed time unit, Phanerozoic, eon with visible abundant life, Paleozoic, marine life diversifies; plants and amphibians, Permian mass extinction, ends the Paleozoic, Mesozoic, dinosaurs dominate; first mammals and birds, Non-avian dinosaur extinction, ends the Mesozoic, Cenozoic, mammals diversify; humans appear late

Geologic Time Scale

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