In the previous post I mentioned the glacial till exposure near Whiteford Point, Gower. According to expert accounts, some of these rocks show frost damage caused by the ice sheet and the icy conditions 17,000 years ago. The photographs in this post illustrate what I believe to be some of these frost-damaged rocks. The stones in the first two pictures, exhibit multiple parallel splitting. The third image shows a stone, maybe of a different type, with a single crack. It is easy to imagine how the smaller pieces of stone that cleave from these rocks end up as the large, flat, smoothed pebbles so typical of the beach further along to the north east. The final picture shows some of these pebbles with my walking pole to give scale.
The earlier related post is Pebbles, spits & banks at Whiteford (2).
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Jessica's Nature Blog 
These rocks look much like the ones I see on my walks along the Nova Scotia shore. I never considered the frost-cracking idea …
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It could be the same sort of phenomenon that has affected the rocks on Nova Scotia shoreline if I am correct in my idea that these rocks have been cracked by severe frosts in and around the ice ages.
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