Now.....the tooth on the left is a Megalodon.
The one on the right is from a Great White Shark.
How in the hell could a medaieval wall builder, bearing in mind that each stone is carefully packed in place, not realise that this was some kind of tooth?
Just for info, a dry stone wall has two "faces" of large flat stones, placed so that they fit closely and interlock, gradually sloping inwards so that they eventually meet in the middle at a height of about four or five feet above ground level. The gap in the middle is tightly packed with waste stone material, to make the wall solid and stable.
The top of the wall is then dressed, usually with the flat stones facing upwards (see pics).
(sound Jaws music......dan dan dan dan dan dan )
I'll try and find the newspaper article........