Some Account of the Strata and Volcanic Appearances... 1790.

Fig. 1. View of the Glen near Ardlun Head in Mull.
Fig. 2. View of the insulated Rock at the termination of the Glen.
Fig. 3. A view of the great Fissure, the Cave and the suspended Stones, in the Island of Mull. The fissure ranges N. and S., is about ten feet wide and forty yards deep: the sides and the suspended stones are granite.

From: Some account of the Strata and Volcanic Appearances in the North of Ireland and Western Isles of Scotland. In two letters from Abraham Mills Esq. to John Lloyd, Esq. F.R.S. Read January 21, 1790. Published in Phil. Trans. Vol LXXX.