#geological_era__era  a major division of geological time; an era is usually divided into two or more periods
  supertype:  #geological_time__geologic_time__geologictime  the time of the physical formation and development of the earth (especially prior to human history)
  instance:  #Cenozoic_era  #Mesozoic_era  #Paleozoic_era  #Precambrian_period  #Proterozoic  #Archean_era
  part:  #geological_period
  part of:  #aeon__eon  the longest division of geological time; two or more eras

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