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Sue -- this is quite fun, and indeed a puzzle. I think the idea of a rotten granite boulder being deposited in till on the Yorks or Lincs coast (and being collected from there) is vanishingly unlikely. Granite is OK to be transported by ice when it is very fresh -- and it survives very well. Rotten granite just gets crushed and destroyed. I think this granite was emplaced by ice at this location when it was fresh, and over millions of years has simply rotted away, bit by bit, since then.
But certainly very intriguing!!
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