The structure is modest in scale, roughly fifteen metres across, but it is the construction method that sets it apart: instead of a single bank of rubble or a simple wall, the boundary is formed by a double line of upright stones placed edge to edge, their flat faces forming a continuous barrier. On the eastern to south-western arc and again from west to north, these stones reach up to 1.2 metres in height, with the interior now grassed over and sitting slightly lower than the surrounding ground. A narrow entrance, just 1.2 metres wide and flanked by two upright slabs, opens to the south-south-east, suggesting whoever built and used this place knew exactly which direction they wanted to face the world.

Radiocarbon dating of peat that had grown inside the enclosure provides a surprisingly precise endpoint for its story. The results, published by O'Brien in 2004 and 2006, indicate that the interior had already begun to accumulate peat by around AD 1200, meaning the structure had been abandoned by that point. The enclosure had therefore fallen out of use before the end of the medieval period, quietly silting up while the wider landscape around it continued to be farmed and settled. The site was still visible enough to be recorded on the Ordnance Survey six-inch map of 1901, which speaks to how well the double stone walls have held their form across the centuries, despite whatever pressures of weather and agriculture might have worked against them.