Paleozoic
Devonian
Late Devonian
Frasnian
1.8 Ma
Paleozoic
Devonian
Late Devonian
Frasnian
Middle Devonian
Givetian
Eifelian
Early Devonian
Emsian
Pragian
Lochkovian
Silurian
Pridoli
Ludlow
Ludfordian
Gorstian
Wenlock
Homerian
Sheinwoodian
Llandovery
Telychian
Aeronian
Rhuddanian
1.8 Ma
Paleozoic
Ordovician
Late Ordovician
Hirnantian
Katian
Sandbian
1344.5 Ma
Paleoproterozoic
Statherian
Orosirian
Rhyacian