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Precambrian, Proterozoic Eon, Archeon Eon, and Hadean

Precambrian, Proterozoic Eon, Archeon Eon, and Hadean

Precambrian is the informal name for the first 4 billion years, or 88 percent, of Earth's history. It includes the Proterozoic and Archeon Eons.

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