Low and broad, the bank rises only a few centimetres above the surrounding ground, and the original entrance has been lost entirely. What makes this particular site quietly puzzling is not what remains but what may have been taken away. A ringfort is typically defined by its enclosing bank and, often, an outer ditch or fosse dug to reinforce it; here, no fosse is visible at ground level, and the bank itself bears the hallmarks of something once more substantial.

The working interpretation is that what survives is not simply an earthen rampart but the robbed-out ghost of a cashel wall. A cashel is a ringfort built in stone rather than earth, its enclosure formed by a drystone wall rather than a banked earthwork. The evidence here is circumstantial but plausible: modern drystone field walls run through the immediate vicinity, and a further drystone wall, oriented roughly east to west, butts directly against the outer face of the bank at the north-north-west. Stone, in other words, has clearly been taken from somewhere in the landscape to build something else, and the dimensions of the surviving bank, three metres wide but barely above ankle height internally, suggest a structure that was once considerably more imposing. Adding to the oddity is a small disused quarry, roughly circular at about four metres across, sitting just inside the bank on the western side, as though someone had sourced material from within the enclosure itself.

The ground drops away sharply to the west of the site, which would have made the location naturally defensible from that direction regardless of the wall's original height. Ringforts of this kind were typically constructed during the early medieval period, roughly between the fifth and twelfth centuries, and functioned as enclosed farmsteads for a single family or household group rather than as military fortifications in any formal sense. At Tully, what remains is subtle enough that a casual walker might cross it without noticing, the low arc of stone and soil easily mistaken for a field boundary rather than the outline of a much older domestic world.