Paleozoic
Silurian
Wenlock
Sheinwoodian
Llandovery
Telychian
Aeronian
Rhuddanian
2.1 Ma
Paleozoic
Ordovician
Late Ordovician
Hirnantian
Katian
Sandbian
7.0 Ma
Paleozoic
Ordovician
Middle Ordovician
Darriwilian
Dapingian
Early Ordovician
Floian
Tremadocian
5.8 Ma
Paleozoic
Ordovician
Early Ordovician
Tremadocian
Cambrian
Furongian
Stage 10
Jiangshanian
Paibian
Series 3
Guzhangian
1777.2 Ma
Paleoproterozoic
Rhyacian
Siderian
Neoarchean
Mesoarchean