Permo-Carboniferous
coal gap
carboniferous
Guadalupian
anomalistic year
Permian
Bashkirian
Serpukhovian
Gzhelian
Kasimovian
Moscovian
Visean
Cisuralian
Palaeophytic
Sakmarian
Capitanian
Wordian
Artinskian
Kungurian
Asselian
Wuchiapingian
Changhsingian
Roadian
Paleozoic
Ordovician
Orosirian
Pleistocenic
Carboniferous period
Carboniferous
Siderian
Rhyacian
Miocene
Cryogenian
Lopingian
Permian-Triassic extinction
Zechstein
Triassic
Albertan
Pleistocene
Ediacaran
Cambrian
Pteridospermopsida
class Pteridospermopsida
Mississippian
-zoic
Devonian
Carnian
Tonian
Bennettitales
deep time
order Bennettitales
Westphalian
Hettangian
anomalistic month
K-T boundary
Ectasian
Cambrian period
family Bennettitaceae
Phanerozoic eon
Phanerozoic aeon
Bennettitaceae
Cenozoic
Coniacian
Campanian
Statherian
Phanerozoic
Cenomanian
Messinian
Danian
Lower Paleozoic
palaeobiocoenosis
Burdigalian
subclass Synapsida
Thanetian
Selandian
Langhian
Maastrichtian
Tortonian
Miocenic
Serravallian
paleochronology
Synapsida
Pennsylvanian period
Upper Carboniferous period
Pennsylvanian
New Red Sandstone
Jurassic
Paleozoic era
Upper Carboniferous
Calymmian