Detail of rock texture in Carboniferous Limestone at Caswell Bay in Gower, South Wales.
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Detail of rock texture in Carboniferous Limestone at Caswell Bay in Gower, South Wales.
Jessica's Nature Blog 
It looks like vines frozen in place. A trellis.
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Do you know what this kind of rock formation is called? I wondered if it were a septarian concretion, but I don’t think that quite fits. (See https://en.wikipedia.org/wiki/Concretion and https://en.wikipedia.org/wiki/Concretion#/media/File:MoerakiBouldersSunrise.jpg.)
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Thank you, Claudia. Your description fits. I thought that it almost looks like it is a man-made sculptural art work.
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I am not certain what is going on with this rock. I think it might be something to do with the process of dolomitization of the limestone. This is where magnesium carbonate intrudes into, or replaces, calcium carbonate in the limestone. The magnesium carbonate is harder than the calcium carbonate and so it remains as these upstanding veins when the softer calcium carbonate weathers away. Not sure about this but dolomitic limestone does occur at that beach. I don’t think it is the same process as concretions or septarian nodule formation https://natureinfocus.blog/2013/05/15/septarian-nodules-at-ringstead/
https://natureinfocus.blog/2011/06/28/giant-burger-bun-stones-at-osmington-bay/
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Yes, very regular, very gridlike. Out of context it would be hard to say, I agree.
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😊
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Very thoughtfull blog
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Thank you, Grant.
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