8 Replies to “On the rocks at Caswell Bay 30”

  1. 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/


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