Geological units
Aalenian (Jurassic / Middle Jurassic )
Aeronian (Silurian / Llandovery )
Albian (Cretaceous / Lower Cretaceous )
Anisian (Triassic / Middle Triassic )
Aptian (Cretaceous / Lower Cretaceous )
Aquitanian (Neogene / Miocene )
Artinskian (Permian / Cisuralian )
Asselian (Permian / Cisuralian )
Bajocian (Jurassic / Middle Jurassic )
Barremian (Cretaceous / Lower Cretaceous )
Bartonian (Paleogene / Eocene )
Bashkirian (Carboniferous / Pennsylvanian )
Bathonian (Jurassic / Middle Jurassic )
Berriasian (Cretaceous / Lower Cretaceous )
Burdigalian (Neogene / Miocene )
Calabrian (Quarternary / Pleistocene )
Callovian (Jurassic / Middle Jurassic )
Calymmian (Proterozoic / Mesoproterozoic )