Details of our Geology

Our geology spans an estimated 1800 million years with a huge range of rock types and sediments

• History of the geological exploration of Anglesey
• Edward Greenly and the geology of Anglesey
• Precambrian rocks – the Mona Complex
• Precambrian geosite : Marquess of Anglesey’s column
• Precambrian Geosite : Llanlleiana
• Anglesey’s Cambrian, Ordovician and Silurian rocks
• Geosite : Slate mining on Anglesey
• Geosite : Porth Wen
• Geosite : Parys Mountain copper mine
• The Devonian Period (416 – 359 Ma)
• The Carboniferous Period (359 – 299 Ma)
• Limestone pavements and Karst scenery
• Permian – Triassic periods 299-200 Ma
• Geomorphology and Quaternary of Anglesey
• The legend of Seithennin : drowned lands around Anglesey’s coastline
• and so to the present day…..

The Scottish Geology Trust have produced a very detailed website documenting most important geological sites in Wales, including our own, with hyperlinks to a map.

Back to Top