Ardtun, a grand basaltic headland in the SW of Mull, Argyllshire, projecting from the N side of the Ross of Mull, at the mouth of Loch Scriden. It is cut by a wild ravine, called the Goblins' Dell; it rises to a height of about 130 feet; it shows basaltic scarcely inferior to those of Staffa; and it includes a thin stratum of coal beneath its basalt, and three leaf beds aggregately about 6 feet thick, and probably belonging to the middle portion of the geognostic Tertiary period. Dr Johnson, when on his way from Inch Kenneth to Iona, greatly admired its columnar formation; and Dr Macculloch, the present Duke of Argyll, and the late Professor Edward Forbes, made interesting investigations into its geological peculiarities.
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