#geological_time__geologic_time__geologictime  the time of the physical formation and development of the earth (especially prior to human history)
  supertype:  #time  the continuum of experience in which events pass from the future through the present to the past
  subtype:  #aeon__eon  the longest division of geological time; two or more eras
  subtype:  #geological_period__period  a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
     subtype:  #ice_age__iceage__glacial_period__glacialperiod__glacial_epoch  any period of time during which glaciers covered a large part of the earth's surface
     instance:  #Quaternary_period__Quaternary__Age_of_Man  #Tertiary_period__Tertiary  #Cretaceous_period__Cretaceous  #Jurassic_period__Jurassic  #Triassic_period__Triassic  #Permian_period__Permian  #Carboniferous_period__Carboniferous  #Pennsylvanian_period__Pennsylvanian__Upper_Carboniferous__Upper_Carboniferous_period  #Missippian_period__Mississippian__Lower_Carboniferous__Lower_Carboniferous_period  #Devonian_period__Devonian__Age_of_Fishes  #Silurian_period__Silurian  #Ordovician_period__Ordovician  #Cambrian_period__Cambrian
  subtype:  #geological_era__era  a major division of geological time; an era is usually divided into two or more periods
     instance:  #Cenozoic_era__Cenozoic__Age_of_Mammals  #Mesozoic_era__Mesozoic__Age_of_Reptiles  #Paleozoic_era__Paleozoic  #Precambrian_period__Precambrian  #Proterozoic__Preoterozoic_era  #Archean_era__Archean__Archeozoic__Archaeozoic__Archeozoic_era__Archaeozoic_era
  subtype:  #epoch  a unit of geological time
     instance:  #Holocene_epoch__Holocene__Recent_epoch  #Pleistocene_epoch__Pleistocene__Glacial_epoch  #Pliocene_epoch__Pliocene  #Miocene_epoch__Miocene  #Oligocene_epoch__Oligocene  #Eocene_epoch__Eocene  #Paleocene_epoch__Paleocene

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