A semicircular arc of drystone walling, running roughly north to south across a span of about 29 metres, has emerged along the cutting face. Only the foundation course survives, but that low spine of stone is enough to trace the outline of an enclosure that was already ancient when the bog began to grow over it.

The structure is classified as a pre-bog enclosure, meaning it predates the formation of the peat blanket that now covers the greater part of it. Blanket bogs in the west of Ireland typically began to form during the Bronze Age or earlier, accumulating over landscapes that had been farmed, settled, and cleared of woodland over long periods. That process of enclosure beneath peat has, paradoxically, preserved what survives. The bulk of the wall remains sealed under the bog, and a cluster of stones in the north-western part of the exposed interior, just east of the cutting face, may be the remnant of a hut. Roughly 100 metres to the west lies a megalithic tomb, one of those large prehistoric stone burial monuments found across the Irish landscape, suggesting that this corner of Tooraskeheen was a place of some significance in the prehistoric period, with habitation and ritual activity in close proximity.