Earth Geology Geologic Time Scale Permian Period

Permian Period

The Permian time period lasted from 286 to 245 million years ago, a time span of 41 million years. The Permian is the last period of the Paleozoic Era. The term Permian was first used in the late 1840s to describe a sequence of rocks in the Russian province of Perm, east of the Volga River. These Permian rocks were defined based on a particular type of fossil assemblage contained within them. They are located above the rocks of the Pennsylvanian System and below the rocks of the Triassic System.