What is recorded here

Penrhyn Sant Ioan is shown as a headland on the public map of Pembrokeshire. The saved point is the map point or the centre of its mapped shape.

Penrhyn Sant Ioan is a headland composed primarily of Silurian greywacke and mudstone, formed around 440–420 million years ago through deep-marine sedimentation and subsequent tectonic compression. It is notable for its resistant rock formations that have withstood coastal erosion, contributing to the rugged character of Pembrokeshire's coastline.

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