Ordovician Timechart
The oldest period to be represented in the rocks of Fforest Fawr Geopark; it lasted from 495 to 443 million years ago.
The Ordovician Period
This period extended over 52 million years. It is divided into three series/epochs, which are further subdivided into various stages/ages.
- Late/upper Ordovician epoch
- Ashgillian stage
- Caradocian stage
- Middle Ordovician (Llanvirnian) epoch
- Llandeilian stage
- Abereiddian stage
- Early/lower Ordovician epoch
- Arenigian stage
- Tremadocian stage
