What is recorded here

Porth yr Ebol 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 a deep marine environment. These rocks are part of the extensive Ordovician and Silurian sequences that form much of Anglesey’s geology and are notable for their role in the island’s Carboniferous basalt-capped mountain formations.

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