It's an Anglesey TV Sixty Second Geology Lesson. 🎥 Bwa Gwyn – The White Arch of Anglesey. Along the rugged coast near Rhoscolyn, the White Arch — Bwa Gwyn in Welsh — is more than just a breathtaking photo spot. It’s a masterpiece sculpted by nature over half a billion years. These ancient rocks, mostly schists and quartzites, date back over 500 million years, part of the South Stack Group — some of the oldest rocks in Wales. Over centuries, the roaring sea and fierce westerly winds carved into

Old Geological Map of England & Wales by Roderick Impey Murchison, 1843