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