Cambrian period
Paleozoic era
Ordovician period
Paleozoic era
Permian
Paleozoic era
Silurian period
Paleozoic era
Paleozoic - Wikipediahttps://en.wikipedia.org/wiki/Paleozoic
Paleozoic era

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Paleozoic era
Phanerozoic

Names and synonyms

  • Paleozoic era
  • Palaeozoic era