Individual #Silurian_period__Silurian  from 405 million to 425 million years ago; first air-breathing animals
  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"

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


Simple category search: