Boudins

This a rock outcrop near the end of the harbour wall at Port of Ness. If you look carefully you can see the dark bands of iron-rich amphibolite that have been stretched in the mountain-building tectonic movements. The dark bands have been stretched like a bar of toffee and sections have thinned until the layer snapped, creating eye-shaped dark lumps, called boudins. These rocks are about 3,700 million years old.