Some small stones have been found [in the parish of Wick], which seem to be a species of flint, about an inch long and half an inch broad, of a triangular shape, and barbed on each side. The common people confidently assert, that they are fairies arrows, which they shoot at cattle, when they instantly fall down dead, though the hide of the animal remains quite entire. Some of those arrows have been found buried a foot under ground, and are supposed to have been in antient times fixed in shafts, and shot from bows. Some stones also of a flinty nature have been found, which when broken contained the shape of serpents coiled round in the heart of the stone.
From the Statistical Account of 1791-99 vol.10 p.15 : Wick, County of Caithness.