Individual #Paleozoic_era__Paleozoic  from 230 million to about 544 million years ago
  instance of:  geological_era
  part:  Permian_period__Permian  from 230 million to 280 million years ago; reptiles
  part:  Carboniferous_period__Carboniferous  from 280 million to 345 million years ago
     part:  Pennsylvanian_period__Pennsylvanian__Upper_Carboniferous__Upper_Carboniferous_period  from 280 million to 310 million years ago; warm climate; swampy land
     part:  Missippian_period__Mississippian__Lower_Carboniferous__Lower_Carboniferous_period  from 310 million to 345 million years ago; increase of land areas; primitive ammonites; winged insects
  part:  Devonian_period__Devonian__Age_of_Fishes  from 345 million to 405 million years ago; dominance of fishes and appearance of amphibians and ammonites
  part:  Silurian_period__Silurian  from 405 million to 425 million years ago; first air-breathing animals
  part:  Ordovician_period__Ordovician  from 425 million to 500 million years ago; conodonts and ostracods and algae and seaweeds
  part:  Cambrian_period__Cambrian  from 500 million to about 544 million years ago; marine invertebrates

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