Individual #Stone_Age  (archeology) the earliest known period of human culture, characterized by the use of stone implements
  part:  Eolithic_Age  Paleolithic_Age  Mesolithic_Age  Neolithic_Age
  part of:  prehistory
  type:  time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"

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