What is recorded here

Porth yr Ogof 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 Ogof on Ynys Môn (Isle of Anglesey) is a coastal bay featuring Lower Palaeozoic mudstones and shales, part of the Llanberis Beds, formed during the Ordovician period around 470–460 million years ago. These rocks were deposited in deep marine conditions and are notable for their role in understanding the geological history of the Welsh Basin.

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