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Fence of Ordovician slate from the Penrhyn quarries. The light-coloured spots, up to five cm by two cm on the cleavage, and <1cm thick, were spherical spots in mud before the rocks deformed during the Caledonian collision.
PhotoID318

Fence of Ordovician slate from the Penrhyn quarries. The light-coloured spots, up to five cm by two cm on the cleavage, and <1cm thick, were spherical spots in mud before the rocks deformed during the Caledonian collision.
PhotoID318

Photograph: Jim Talbot

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