You would think that all the limestone strata on the Worms Head Causeway in Gower would be worn down equally to a smooth, flat, even surface – but not so. Upstanding at various points on what I suppose is really a wave-cut platform (albeit eroded by acid rain and seashore creatures as well), isolated areas remain standing. They look like giant teeth embedded in the worn surface strata. I do not know why these areas are more resistant, however, I have read that some parts of the limestone become harder by dolomitisation, a process in which the calcium carbonate is converted to magnesium carbonate by the intrusion of seawater (I think before the original sediments harden and compact). Maybe that is the explanation.