#craton  the part of a continent that is stable and forms the central mass of the continent; typically Precambrian
  supertype:  #physical_part__part__piece  a portion of a natural object; "they analyzed the river into three parts"; "he needed a piece of granite"
  part of:  #continent  one of the large landmasses of the earth; "there are seven continents"; "pioneers had to cross the continent on foot"

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