What is recorded here

Porth yr Halen 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.

Porth yr Halen 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 an ancient marine environment. The area is notable for its well-exposed cliff sections that provide insights into the geological history of the Welsh Caledonides.

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