Archaean

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English[edit]

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Adjective[edit]

Archaean (not comparable)

  1. (geology) of, or relating to the geologic eon from about 3,800 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life

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Proper noun[edit]

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Archaean

  1. (geology) The eon from 2,500 Ma to 4,000 Ma.

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