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Archean Eon

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About 1 pages (76 words)
Archean Summary

Older of the two divisions of Precambrian time.

The Archean begins with the formation of the Earth's crust 4 billion years ago and extends to 2.5 billion years ago, up to the start of the Proterozoic Eon, the second division of the Precambrian Period. The earliest and most-primitive forms of life (bacteria and cyanobacteria) originated more than 3.5 billion years ago in the middle of the Archean Eon (the Archean's alternative name, Archeozoic, means “ancient life”).

This is the complete article, containing 76 words (approx. 1 page at 300 words per page).

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    Archean Eon from Encyclopedia Brittanica. ©2009 Encyclopedia Brittanica. All rights reserved.

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