Paleozoic
Carboniferous
Pennsylvanian
Bashkirian
37.3 Ma
Paleozoic
Carboniferous
Mississippian
Tournaisian
Devonian
Late Devonian
Famennian
Frasnian
1.3 Ma
Paleozoic
Devonian
Middle Devonian
Givetian
1.7 Ma
Paleozoic
Devonian
Middle Devonian
Givetian
Eifelian
Early Devonian
Emsian
3.6 Ma
Paleozoic
Devonian
Early Devonian
Emsian
4.1 Ma
Paleozoic
Devonian
Early Devonian
Pragian
10.5 Ma
Paleozoic
Devonian
Early Devonian
Lochkovian
Silurian
Pridoli
Ludlow
Ludfordian
Gorstian
Wenlock
Homerian
Sheinwoodian
Llandovery
Telychian
3.8 Ma
Paleozoic
Silurian
Llandovery
Telychian
Aeronian
1.2 Ma
Paleozoic
Silurian
Llandovery
Aeronian
Rhuddanian
Ordovician
Late Ordovician
Hirnantian
2.3 Ma
Paleozoic
Ordovician
Late Ordovician
Katian
Sandbian
Middle Ordovician
Darriwilian
34.1 Ma
Paleozoic
Cambrian
Furongian
Jiangshanian
Paibian
Series 3
Guzhangian
472.1 Ma
Neoproterozoic
Tonian
Mesoproterozoic
Stenian
290.0 Ma
Mesoproterozoic
Ectasian
Calymmian