GZHELIAN

The 'Gzhelian Age' is the last of four ages in the Pennsylvanian Epoch of the Carboniferous period. It lasted from approximately 303.9±0.9 to 299.0±0.8 million years ago. It was preceded by the Kasimovian age and followed by the Asselian age of the Cisuralian epoch. This age is named after the town of Gzhel in Russia