Unfortunately the tree - a hawthorn - is deceiving. It's a nice sized boulder, but only (according to the Archaeological Inventory) 1.3m*1m*0.9m. The BB nearby and east of it is much more substantial, and typical; 2.5m*1.4m*1.35m and that in addition to supports. It's a wonderful, pyramidal shape and the views, the views; to Corran and Carrigfadda. Your mind just drifts.