Individual #Archean_era__Archean__Archeozoic__Archaeozoic__Archeozoic_era__Archaeozoic_era  the time prior to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
  part of:  #Precambrian_period
  type:  #geological_era__era  a major division of geological time; an era is usually divided into two or more periods

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