exposed by erosion.

Much more recently, Ulva was subjected to glaciation, which dug out the fjords/sea lochs on its north and south east sides - Loch Tuath (meaning simply "north loch") and Loch na Keal, as well as softening some of its sharper edges.

The Hebridean coastline has been subject to significant post-glacial changes in sea level and the area is rising up at about 2 mm per annum as isostatic equilibrium is regained. The relative drop in sea-level has left the highest raised sea cave in

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