System Series (NW Europe) Stage (NW Europe) Series (ICS) Stage (ICS) Age (Ma) Permian younger Carboniferous Silesian Stephanian Pennsylvanian Gzhelian 298.9–303.7 Westphalian Kasimovian 303.7–307.0 Moscovian 307.0–315.2 Bashkirian 315.2–323.2 Namurian Mississippian Serpukhovian 323.2–330.9 Dinantian Visean Visean 330.9–346.7 Tournaisian Tournaisian 346.7–358.9 Devonian older Subdivisions of the Carboniferous system in Europe compared with the official ICS-stages (as of 2018)