Just a few miles northwards, the rock at the coast is noticeably different to that at our local beach. It is softer, so erodes with a completely different feel to the textures and shapes visible.
The barnacles and limpets certainly love it, and I think the limpets have had something to do with the creation of the shapes. You can see little cones in the middle of the depressions, and I think the limpets follow a path, round and round, creating their track in the softest rock as they go over many years, which leaves the cones as the raised, untravelled centre point. If you look closely, you’ll see that process in action with some of the bowls occupied by a hard working limpet.
You can see the texture better by clicking the picture, which makes it full size in a new tab of its own.
Bear Humphreys Photo 
I clicked to expand it and so glad I did—those textures are so unique and beautiful!
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It’s brilliant to be able to work out what’s going on and see it. There are limpet tracks on the harder local rocks, but nowhere near as deep and shaped as these are.
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That is just incredibly cool. Limpets are not a species I know much about, but their unwitting artwork is spectacular!
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I’m only guessing at my explanation, happy if any marine biologist wants to weigh in with a correction here!
When the tide’s out, they are almost glued on to their ‘home’ spot. When the ocean comes over them, they start to move and feed using a very hard tongue… I guess softer rock just wears away more with the rasping they do.
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