Cenozoic
Quaternary
Holocene
Pleistocene
Late Pleistocene
Middle Pleistocene
Calabrian
Gelasian
299.9 Ma
Paleozoic
Carboniferous
Pennsylvanian
Gzhelian
Kasimovian
Moscovian
Bashkirian
1.8 Ma
Paleozoic
Carboniferous
Pennsylvanian
Bashkirian
Mississippian
Serpukhovian
93.1 Ma
Paleozoic
Devonian
Early Devonian
Lochkovian
Silurian
Pridoli
Ludlow
Ludfordian
Gorstian
Wenlock
Homerian
Sheinwoodian
Llandovery
Telychian
Aeronian
Rhuddanian
Ordovician
Late Ordovician
Hirnantian