5 Neogene Period Silurian Period Jurassic Period Cambrian Period Stenian Period Permian Period Triassic Period Rhyacian Period GeochronologicEras of rank "Period" Siderian Period Quaternary Period Ordovician Period Cryogenian Period Paleogene Period Carboniferous Period Cretaceous Period Ediacaran Period Statherian Period Ectasian Period Calymmian Period Tonian Period Devonian Period Orosirian Period