On the left side of the south window of the aisle is a fragment of primitive carving , perhaps from the time of St Kentigern. If this simple engraving resembles a ‘solar cross’, its six spokes also suggest the Celtic wheel associated with Taranis, or Thor. But it could also be a crude attempt at depicting the fall of man. In the Irish ‘scripture stone’ from Carndonagh, in County Donegal, the seven spokes represent branches of the tree from which Eve plucked the fatal fruit, and the trunk ends in roots. By analogy, the circles in the Barton stone may signify fruit, and the lines at the bottom right may represent the heads of Adam and Eve, huddled by the trunk of the tree.