Geologic Time Scale Overview

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Geologic Time Scale

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Chronological dating system

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Eon

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Largest division of geologic time

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Era

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Subdivision of an eon

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Period

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Subdivision of an era

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Precambrian Time

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From Earth's formation to Cambrian Period

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Paleozoic Era

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Era of early life forms

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Mesozoic Era

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Age of reptiles

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Cenozoic Era

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Age of mammals

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Cambrian Explosion

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Major event of animal phyla appearance