Geological units
Cambrian Series 2 (Cambrian )
Cambrian Series 3 (Cambrian )
Cambrian Stage 10 (Cambrian / Furongian )
Cambrian Stage 2 (Cambrian / Terreneuvian )
Cambrian Stage 3 (Cambrian / Cambrian Series 2 )
Cambrian Stage 4 (Cambrian / Cambrian Series 2 )
Cambrian Stage 5 (Cambrian / Cambrian Series 3 )
Campanian (Cretaceous / Upper Cretaceous )
Capitanian (Permian / Guadalupian )
Carnian (Triassic / Upper Triassic )
Cenomanian (Cretaceous / Upper Cretaceous )
Changhsingian (Permian / Lopingian )
Chattian (Paleogene / Oligocene )
Cisuralian (Permian )
Coniacian (Cretaceous / Upper Cretaceous )
Cryogenian (Proterozoic / Neoproterozoic )
Danian (Paleogene / Paleocene )
Dapingian (Ordovician / Middle Ordovician )