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Geological Formations

Dubh Artach

Erosional and Karst Formations

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Dubh Artach is a small basalt skerry in the Inner Hebrides, lying about eighteen miles west of Colonsay and fifteen miles southwest of the Ross of Mull off the west coast of Scotland. The uninhabited rock is battered by exceptionally severe seas, with recorded waves rising higher than ninety feet, and its exposed area covers only about 32,300 square feet at a highest point of thirty-six feet above the water. Between 1867 and 1872 the engineer Thomas Stevenson built a 145-foot lighthouse on the rock, supported from a shore station on the nearby island of Erraid; the light was automated in 1971. The Gaelic name, also rendered Dubh Hirteach, most likely means the black rock.

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