Sedimentary rock strata patterns

Seashore Rock Patterns RB10.18

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The appearance of the rocks in the cliffs at Rhossili Bay steadily changes. It changed most of all in relatively recent years when the limestone was quarried. But for all the time the rocks have been exposed they have been subject to almost imperceptible weathering and loss. Sometimes the attrition is noticeable, especially if you take a photographic record over the a series of years. The parts that get heavily pounded by the waves gradually break off in small pieces – sometimes revealing bright orange under-colours that eventually fade back to grey. Higher on the shore where the rocks are exposed for greater lengths of time to the air, the strata are colonised by black and yellow lichens that eat into the rocks on a microscopic scale.

9 Replies to “Seashore Rock Patterns RB10.18”

  1. I think this part of the cliff face is natural – but further along there are recessed areas where the limestone used to be quarried. It is an interesting place affected by fault lines.

  2. An interesting post. I noticed some rocks in the stream near Ilston church the other day, they were a beautiful green/blue. Perhaps they had recently come away from the river bank and so were a different colour?

  3. I wonder what the green/blue rocks are? Liston is an interesting place geologically because it is at the junction of different rock types, the limestone that forms the major part of Gower meets the Marros Group at the base of the coal measures. Liston Quarry is the place to see these different types in section. On top of everything there is glacial drift which contains many foreign types of rock from much further afield, brought to Gower on the bottom of an ice sheet.

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