Archean

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What Wikipedia says

The Archean (IPA: ar-KEE-ən, also spelled Archaean or Archæan), in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth's history, preceded by the Hadean Eon and followed by the Proterozoic and the Phanerozoic.

Excerpt from the Wikipedia article “Archean”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tim Bertelink, CC BY-SA 4.0, via Wikimedia Commons.