#prehistory  the time during human development before the appearance of the written word
  supertype:  time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  part:  Bronze_Age  (archeology) a period between the Stone and Iron ages, characterized by the manufacture and use of bronze tools and weapons
  part:  Iron_Age  (archeology) the period following the Bronze Age; characterized by rapid spread of iron tools and weapons
  part:  Stone_Age  (archeology) the earliest known period of human culture, characterized by the use of stone implements
     part:  Eolithic_Age  the earliest part of the Stone Age marked by the earliest signs of human culture
     part:  Paleolithic_Age  second part of the Stone Age beginning about 750,000 years ago
     part:  Mesolithic_Age  middle part of the Stone Age beginning about 15,000 years ago
     part:  Neolithic_Age  latest part of the Stone Age beginning about 10,000 BC in the middle east (but later elsewhere)
  part:  ice_age__iceage__glacial_period__glacialperiod__glacial_epoch  any period of time during which glaciers covered a large part of the earth's surface

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