It measures roughly fifteen and a half metres across and rises between one and two metres, which is enough to register as a deliberate human construction rather than a quirk of the terrain, though the encroaching bog does its best to blur that distinction. From this position on the ridge, the ground falls away steeply to the north, south, and west, and the views open out across a broad arc to the south and northwest, suggesting that whoever chose this spot was attentive to the landscape in ways that went beyond simple convenience.

This is a prehistoric cairn, a type of monument typically constructed during the Neolithic or Bronze Age periods as a burial or ceremonial structure, built here from the mica-schist that characterises much of the local geology. The material is significant in a quiet way: mica-schist is a metamorphic rock with a faintly glittering surface, and the slabs would have been gathered from the immediate surroundings rather than transported any distance. The cairn does not stand in isolation on the ridge. A second cairn of the same general type lies approximately 450 metres to the east, which raises the possibility that the two monuments were related in purpose or constructed by the same community across a shared ceremonial landscape. Whether that relationship was contemporaneous or accumulated over generations is not something the surviving fabric can settle.