The first and longest of the Archean eon's four eras, spanning from the start of the Archean about 4 billion years ago to about 3.6 billion years ago. It is defined chronometrically rather than by a physical stratotype, and it covers the interval in which some of Earth's oldest surviving continental crust formed, including gneiss terrains in Canada and Greenland. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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1. Wikipedia: Archean
WikipediaLead sectionQuote, Lead section
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.
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