geological time scale: eras and periods

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eons

1) hadean 2) archean 3)proterozoic 4) phanerozoic

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eras

Paleozoic, mesozoic, cenozoic

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paleozoic period:

cambrian, ordovician, silurian, devonian, carboniferous, permian

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mesozoic period:

Triassic, Jurassic, cretaceous

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cenozoic period:

tertiary, quanteinary