Pennsylvanian
geo:time:period:pennsylvanianPennsylvanian Sub-period (323.2–298.9 Ma): late Carboniferous; coal-forming swamp forests peak; first reptiles; major glaciations in southern Gondwana.
Pennsylvanian Sub-period (323.2–298.9 Ma): late Carboniferous; coal-forming swamp forests peak; first reptiles; major glaciations in southern Gondwana.