Definitions
Archaean Tweet Definition of Archaean Like Definition of Archaean on Facebook
noun 
  1. (geology) the Archaean eon
adjective 
  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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