The Paleozoic or Palaeozoic Era (from the Greek palaios (παλαιός), "old" and zoe (ζωή), "life", meaning "ancient life")'s the earliest of three geologic eras of the Phanerozoic eon. The Paleozoic spanned from roughly (ICS, 2004), and's subdivided into six geologic periods; from oldest to youngest they're: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian Paleozoic life The Paleozoic covers the time from the first appearance… (More on Paleozoic)