Walk the pasture where it ought to be and you will find nothing: no earthwork, no ridge in the turf, no shadow of a bank. Yet the Ordnance Survey's six-inch map, drawn up in 1839, recorded something here clearly enough to name it, an embanked enclosure roughly fifty to fifty-five metres in external diameter, sitting quietly at the hill's north-western base with a small stream running to its immediate north-west.

Embanked enclosures of this kind are generally understood to be early medieval in character, likely used for settlement, stock management, or both, defined by a raised earthen bank rather than a stone wall or ditch. What makes this particular example curious is how thoroughly it has since disappeared. By the time anyone looked closely at ground level, the enclosure had been absorbed into the working landscape, its circuit now indistinguishable from an ordinary field bank, one that also happens to serve as the townland boundary between Ballyminaun Hill and Coolnastudd to the west and north. The enclosure did not vanish so much as it was quietly repurposed, its shape pressed into service as a property line and then forgotten as anything older.

The 1839 Ordnance Survey mapping is the sole surviving evidence that someone once recognised this as a distinct feature worth recording. That the cartographers noted it at all suggests it retained enough visible form in the early nineteenth century to be distinguishable from the surrounding field system. Whatever remained above ground in the decades since has been levelled by cultivation or simply settled back into the earth, leaving the map entry as a kind of ghost outline where an enclosure once stood.