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Earth was just now starting to geologically form.
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Earth's crust had cooled enough to allow the continents and life started to form.
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Eon spanning from the time oxygen first appeared on Earth to just before complex life started forming.
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First geological period of the Paleozoic Era
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First major subdivision of the Carboniferous Period.
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First and shortest period of Mesozoic Era
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Was the middle period in the Mesozoic Era, also known as the age of reptiles.
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Third and final period in the Mesozoic Period, ended with mass extinction
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Was a period of time consisting from 66-2.6 mya.
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Is the most current and most recent of the three periods.
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