OLYMPUS DIGITAL CAMERAThe geology of the site is considered of great importance and Coed-y-Werin has been designated a Site of Special Scientific Interest (SSSI) because of this.

Over 350 million years of geological history are revealed in the exposed rocks. You may be able to find fossils that were trapped in the layers of coal, mudstone and ironstone, formed when tropical swamps covered the area in prehistoric times.


You will also be able to see coal seams that were famously mined in the Rhondda, Taff and Rhymney valleys. The coal was taken all over the world from the ports of Cardiff and Barry.