Cenozoic
Quaternary
Holocene
Pleistocene
Late Pleistocene
Middle Pleistocene
Calabrian
Gelasian
451.9 Ma
Paleozoic
Ordovician
Late Ordovician
Sandbian
547.5 Ma
Mesoproterozoic
Stenian
Ectasian
Calymmian
Paleoproterozoic
Statherian
Orosirian
Rhyacian
Siderian
Neoarchean
Mesoarchean