Just across the headland south of Stenness there is less shelter and the sea has more fury; the island is Dore Holm. The rock here is basalt, formed when there is was a volcanically active location some 360 million years ago.
Uploaded to Geograph by Stephen McKay on 1 February 2017
Photo © Stephen McKay, 1 February 2017.
Licensed for reuse under this Creative Commons licence