I would think this relates to Dunan Mor (or Dunan Beag) as they are near to North Blairmore. You'd think there would be nearer stones to use.
On the farm of Blairmore, near the base of Dunfiun, may be seen the scattered ruins of a chambered cairn. On the stones being carried away some years ago, to build the Lamlash school-house, a series of inner cells was exposed, each covered with a single flat stone.
p22 in 'The Antiquities of Arran' by John McArthur (1861).