Geological units
Neoproterozoic (Proterozoic )
Norian (Triassic / Upper Triassic )
Olenekian (Triassic / Lower Triassic )
Oligocene (Paleogene )
Orosirian (Proterozoic / Paleoproterozoic )
Oxfordian (Jurassic / Upper Jurassic )
Paibian (Cambrian / Furongian )
Paleoarchean (Archaean )
Paleocene (Paleogene )
Paleoproterozoic (Proterozoic )
Pennsylvanian (Carboniferous )
Peruc-Korycany Formation (Cretaceous / Upper Cretaceous / Cenomanian )
Piacenzian (Neogene / Pliocene )
Pleistocene (Quarternary )
Pliensbachian (Jurassic / Lower Jurassic )
Pliocene (Neogene )