Pennsylvanian

views updated

Pennsylvanian
1. The late Carboniferous sub-period, preceded by the Mississippian, comprising the Bashkirian, Moscovian, Kasimovian, and Gzelian Epochs, and dated at 322.8–290.0 Ma.

2. The name of the corresponding North American subsystem, comprising the Morrowan, Atokan (Derryan), Desmoinesian, Missourian, and Virgilian Series, and roughly contemporaneous with most of the Silesian subsystem (i.e. above Namurian A).

More From encyclopedia.com

About this article

Pennsylvanian

Updated About encyclopedia.com content Print Article

Related Content