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Precambrian time summary

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Learn about the Precambrian time and its division, the Archean and Proterozoic eons

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Below is the article summary. For the full article, see Precambrian.
Proterozoic Eon
Proterozoic Eon Summary
Proterozoic Eon, the younger of the two divisions of Precambrian time, the older being the Archean Eon. The Proterozoic Eon extended from 2.5 billion to 541 million years ago and is often divided into the Paleoproterozoic (2.5 billion to 1.6 billion years ago), the Mesoproterozoic (1.6 billion to 1
Archean Eon
Archean Eon Summary
Archean Eon, the earlier of the two formal divisions of Precambrian time (about 4.6 billion to 541 million years ago) and the period when life first formed on Earth. The Archean Eon began about 4 billion years ago with the formation of Earth’s crust and extended to the start of the Proterozoic Eon