Paleozoic
Permian
Guadalupian
Wordian
Roadian
Cisuralian
Kungurian
Artinskian
3.3 Ma
Paleozoic
Permian
Cisuralian
Artinskian
Sakmarian
Asselian
Carboniferous
Pennsylvanian
Gzhelian
Kasimovian
Moscovian
18.5 Ma
Paleozoic
Carboniferous
Mississippian
Serpukhovian
Visean
91.4 Ma
Paleozoic
Silurian
Ludlow
Gorstian
Wenlock
Homerian
Sheinwoodian
Llandovery
Telychian
1.3 Ma
Paleozoic
Silurian
Llandovery
Telychian
Aeronian
113.8 Ma
Neoproterozoic
Ediacaran
385.1 Ma
Neoproterozoic
Tonian
Mesoproterozoic
Stenian