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Archaean Twit Definition of Archaean Share Definition of Archaean on Facebook Digg:Definition of Archaean! stumble Definition of Archaean Bookmark Definition of Archaean on Delicious submit Definition of Archaean to reddit Bookmark Definition of Archaean
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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