Original: The Paleozoic or Palaeozoic Era ( from the Greek palaios ( ) , '' old '' and zoe ( ) , '' life '' , meaning '' ancient life '' ) is the earliest of three geologic eras of the Phanerozoic Eon .
Simplified: The Palaeozoic ( or Paleozoic ) era is the earliest of the three eras of the Phanerozoic .