#epoch  a unit of geological time
  supertype:  #geological_time__geologic_time__geologictime  the time of the physical formation and development of the earth (especially prior to human history)
  instance:  #Holocene_epoch  #Pleistocene_epoch  #Pliocene_epoch  #Miocene_epoch  #Oligocene_epoch  #Eocene_epoch  #Paleocene_epoch
  part of:  #geological_period__period  a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
     part of:  #geological_era__era  a major division of geological time; an era is usually divided into two or more periods
        part of:  #aeon__eon  the longest division of geological time; two or more eras

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