After photographing what i took to be a rock i scraped the barnacles and seaweed off which revealed a wood stump, about 8 inches in diameter. Looking northerly into the distance and set in a line there appeared to be 3 or 4 more.
Uploaded to Geograph by Stephen Middlemiss on 17 February 2013
Photo © Stephen Middlemiss, 17 February 2013. Licensed for reuse under this Creative Commons licence