Individual #Devonian_period__Devonian__Age_of_Fishes  from 345 million to 405 million years ago; dominance of fishes and appearance of amphibians and ammonites
  part of:  Paleozoic_era
  type:  geological_period__period  a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"

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