What is recorded here

Porth Lydan is shown as a bay on the public map of Gwynedd. The saved point is the map point or the centre of its mapped shape.

Porth Lydan features a sea cliff composed primarily of Silurian greywacke and slate, formed around 440–420 million years ago through sedimentation and subsequent regional metamorphism. The cliffs are notable for their exposure of ancient volcanic and sedimentary rocks that are part of the Caledonide mountain belt, offering insights into Wales’ complex geological history.

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