Wet rock-face texture and pattern in slate

Polurrian Rocks 8 – Wet cliff-face texture and pattern in Devonian Period meta-sedimentary rocks on the north side of the Lizard Boundary Fault at Polurrian Cove in Cornwall.

7 Replies to “Polurrian Rocks 8”

  1. Hello, Emma. The layers that resemble claw-marks are stratified sediments that were laid down in deep waters. They were part of a kind of underwater alluvial fan created by the rapid erosion of coastal areas by rivers that deposited the material in the sea. There are coarser and finer grained rocks, alternating sandstones and mudstones, originating from a sequence of multiple events. The sedimentary layers in this location have been altered by heat and pressure at a later date, giving rise to the numerous veins. I aim eventually to give an extended explanation of the geology of the location which is particularly interesting, being the junction of surface sedimentary rocks with igneous ones from the earth’s mantle.

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