#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 of:  #aeon
  part:  #geological_period__period  a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
     part:  #epoch  a unit of geological time

No statement uses or specializes #geological_era; click here to add one.