- Era
- Period
- Epoch
- Period
- Paleozoic
- Pre-Cambrian
- Cambrian
- Ordovician
- Silurian
- Devonian
- Carboniferous
- Mississippian (North America)
- Pennsylvanian (North America)
- Permian
- Mesozoic
- Triassic
- Carnian
- Norian
- Rhaeton
- Jurassic
- Hettangian
- Sinemurian
- Pliensbachian
- Toarcian
- Bajocian
- Bathonian
- Callovian
- Oxfordian
- Kimmeridgian
- Portlandian
- Purbeckian
- Cretaceous
- Ryazanian
- Valanginian
- Hauterivian
- Barrenmian
- Aptian
- Albian
- Cenomanian
- Turonian
- Coniacian
- Santonian
- Campanian
- Maastrichtian
- Triassic
- Cenozoic
- Paleogene
- Paleocene
- Eocene
- Oligocene
- Neogene
- Miocene
- Pliocene
- Quaternary
- Pleistocene
- Halocene
- Paleogene