Britannica
Sources used in this answer
Which stages make up the Lower Devonian Series?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Devonian Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the early Devonian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
The Lower Devonian Series is composed of three standard worldwide stages. These stages, listed in chronological order from oldest to youngest, are:1
- Lochkovian Stage: The lowermost division of the Devonian Period, spanning from approximately 419.2 million to 410.8 million years ago.21
- Pragian Stage: The second division, occurring between 410.8 million and 407.6 million years ago.13
- Emsian Stage: The final stage of the Lower Devonian Series.1