Earth Geology Geologic Time Scale Devonian Period

Devonian Period

The Devonian time period lasted from 410 to 360 million years ago, a time span of 50 million years. The term Devonian was first used in the 1830s to describe a sequence of rocks in Devon, England. The name Devonian was derived from the name of that part of England. These Devonian rocks were defined based on a particular type of fossil assemblage contained within them. They are located above the rocks of the Silurian System and below the rocks of the Mississippian System.