Why this matters
Porth y Môr on Ynys Môn (Isle of Anglesey) features coastal rocks primarily composed of Silurian greywacke and mudstone, formed around 440–420 million years ago during sedimentary deposition in a deep marine environment. The area is notable for its well-exposed cliff sections that provide insights into the geological history of the Welsh Basin.
What is recorded here
Porth y Môr is shown as a bay on the public map of Ynys Môn / Isle of Anglesey. The saved point is the map point or the centre of its mapped shape.
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