Gzhelian

Type locality for the Gzhelian in Gzhel, Russia

The Gzhelian is the youngest stage of the Pennsylvanian. It is more or less coeval with the Stephanian Stage of the regional stratigraphy of Europe.

References

1. "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
2. Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press