Cenozoic
Quaternary
Holocene
Pleistocene
Late Pleistocene
Middle Pleistocene
Calabrian
Gelasian
381.0 Ma
Paleozoic
Devonian
Middle Devonian
Givetian
23.7 Ma
Paleozoic
Devonian
Early Devonian
Emsian
Pragian
Lochkovian
Silurian
Pridoli
Ludlow
Ludfordian
Gorstian
Wenlock
Homerian
23.6 Ma
Paleozoic
Ordovician
Late Ordovician
Katian
Sandbian
0.1 Ma
Paleozoic
Ordovician
Middle Ordovician
Darriwilian
42.2 Ma
Paleozoic
Cambrian
Series 3
Drumian
Stage 5
Series 2
Stage 4
Stage 3
Terreneuvian
Stage 2
Fortunian