Look more closely, though, and the outline resolves into something deliberate: a circular cairn, roughly 15.5 metres across and rising to between 1.4 and 1.6 metres in height, its profile softened by centuries of turf and moss. Cairns of this type are prehistoric stone monuments, built up from gathered rock and often associated with burial or ritual, and this one retains much of its original structure beneath the overgrowth. A kerb, the ring of stones set around a cairn's base to retain its shape, is still partly legible here; kerbstones protrude intermittently from the grass on the northern arc, and between the southeast and southwest a more continuous line of eight or nine stones remains visible. A single large stone, measuring around 1.2 metres long and standing 0.9 metres high, projects from the base on the western side, with three further stones emerging between the northeast and east-southeast.

The monument sits on a slight rise at the foot of a south-facing slope, about 20 metres east of a north-south road, and is embedded within an older field system. That relationship between the cairn and the surrounding landscape is where things get layered and a little harder to unpick. A spread of moss-covered stones sitting on top of the cairn, roughly 5 to 6 metres across, appears to be later field-clearance material, added after the original monument was built, perhaps by farmers who found the mound a convenient place to deposit stones turned up by ploughing or grazing. Old grassed-over field walls extend away from the cairn to the west and north, and smaller clearance cairns are scattered nearby. Approximately 30 metres to the south-southeast sits a hut site, suggesting that this part of the Clooneen landscape was, at some point, a place where people not only buried their dead or marked the ground, but also lived and worked it.