What is recorded here
Porth Cynfor on Ynys Môn (Isle of Anglesey) features coastal rocks primarily composed of Silurian greywacke and slate, formed around 440–420 million years ago through deep-sea sedimentation and subsequent mountain-building processes. The cliffs are notable for their exposure of ancient volcanic and sedimentary rocks, part of the broader Caledonide mountain belt, and contribute to the island’s rich geological heritage.
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Places near here
Graig WenMountain / peak · 536 yd
Dinas GynforMountain / peak · 546 yd
Coronation Tower, Llanlleiana HeadTower · 620 yd
Porth Llanlleiana Porcelain and China Clay WorksClay Workings; China Factory · 623 yd
Porth Llanlleiana, Copper Mine and WorksCopper Mine · 643 yd
Porth LlanlleianaBay · 774 yd
TorllwynHeadland · 846 yd
Porthwen Brickworks;Porth Wen Silica Brick WorksBrickworks · 954 yd
Traeth MawrBeach / strand · 1.5 mi
Charles Henry AshleyMemorial · 1.6 mi
CemaesVisitor information · 1.7 mi
Traeth BachBeach / strand · 1.7 miOther information
Photo: Graham Hogg · CC BY-SA 2.0