Individual #Paleozoic_era__Paleozoic  from 230 million to about 544 million years ago
  part:  Permian_period  Carboniferous_period  Devonian_period  Silurian_period  Ordovician_period  Cambrian_period
  type:  geological_era__era  a major division of geological time; an era is usually divided into two or more periods

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