paleozoic era

1. From 544 million to about 230 million years ago (synset 115151883)
   is an instance of: era, geological era - a major division of geological time; an era is usually divided into two or more periods
   has:

   • permian, permian period - from 280 million to 230 million years ago; reptiles
   • carboniferous, carboniferous period - from 345 million to 280 million years ago
   • age of fishes, devonian, devonian period - from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
   • silurian, silurian period - from 425 million to 405 million years ago; first air-breathing animals
   • ordovician, ordovician period - from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
   • cambrian, cambrian period - from 544 million to about 500 million years ago; marine invertebrates
   same as: paleozoic

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