What is recorded here

Porth Gro 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 Gro on Ynys Môn (Isle of Anglesey) features coastal rocks primarily composed of Silurian greywacke and volcaniclastic deposits, formed around 440–420 million years ago during the Caledonian orogeny. These rocks are part of the extensive volcanic and sedimentary sequences of the Welsh Basin, notable for their role in understanding early Paleozoic tectonic activity in Britain.

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