I once found a very large piece of chalk (football sized) in the concrete pad of a pillbox on the beach just down from Warkworth golf club. That got me thinking, the anti tank blocks, was the material brought along from the northside along with shipped in cement? if so, a good amount of the ballast may have been used making them. There is a photo on here which shows the northside hill to be a lot larger 100 years ago.
Next dog walk I'll have a closer look at the upturned blocks and what stone is used
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