Where turf cutting and natural erosion have stripped back the bog along the crest and north-eastern flank of the ridge that impounds Lough Cruttia, the tops of ancient stone walls begin to show through, intermittent and ghostly, protruding just enough to be traced before disappearing again beneath the surface.

These are pre-bog walls, meaning they were built before the peat began to accumulate, on what was once open, workable ground. The bog here reaches a maximum depth of between 1.3 and 1.5 metres, and the walls beneath it run in long, reasonably straight stretches, some up to 100 metres in length. The full extent of the system has not been fully mapped, but even a brief inspection suggests it is more substantial than a related complex recorded on the valley floor nearby. One wall, cut through by a drainage channel, revealed its construction directly on the pre-peat ground surface, confirming just how long it has lain sealed beneath the hillside. The site was first documented by J. Cuppage in the 1986 Dingle Peninsula archaeological survey, a detailed survey of the Corca Dhuibhne region covering the Ballyferriter area.

Field systems like this are not uncommon in the Irish uplands, but they remain quietly remarkable. When peat began forming over much of Ireland in the Bronze Age and into the early medieval period, it preserved whatever lay beneath it, including the walls, field boundaries, and occasionally the houses of farming communities who had cleared and worked the land for generations. What surfaces at Gleann Seanchoirp is, in effect, the outline of someone's agricultural world, interrupted at some point by a gradual environmental shift and then forgotten under centuries of bog.