Cenozoic
Quaternary
Holocene
Pleistocene
Late Pleistocene
Middle Pleistocene
Calabrian
Gelasian
167.6 Ma
Mesozoic
Jurassic
Middle Jurassic
Bajocian
Aalenian
Early Jurassic
Toarcian
254.8 Ma
Paleozoic
Silurian
Wenlock
Sheinwoodian
Llandovery
Telychian
Aeronian
Rhuddanian
Ordovician
Late Ordovician
Hirnantian
Katian
Sandbian
0.5 Ma
Paleozoic
Ordovician
Late Ordovician
Sandbian
Middle Ordovician
Darriwilian
8.3 Ma
Paleozoic
Ordovician
Middle Ordovician
Dapingian
Early Ordovician
Floian
Tremadocian
288.7 Ma
Neoproterozoic
Cryogenian
Tonian
250.0 Ma
Mesoproterozoic
Stenian
-50.0 Ma
Mesoproterozoic
Stenian
Ectasian
Calymmian