And I've temporarily posted another image under Slaggyford Stones of a 'micro cupmarked' stone. It fits your criteria of cupmarks - inverted limpet shape. If they are naturally formed pits then how come the stone has a couple of hundred years of accreted lichen?

I have many photographs - but they are mixed with several hundred other photos 'in deep storage'. The pictures I'd most like to pull out are the small standing stone, of Slaggyford Stones, and the one of the Tarnhouse Rigg standing stone. I have a picture of the stone that surveyors claim to have found - but call it the bumstone. (It's not a good picture).