A cairn in this context is a mound of stones raised over one or more burials, a form of monument common across Bronze Age Ireland, though the particular arrangement preserved at Lattonfasky gives it a quiet distinctiveness.

The cairn here contains evidence of three cists, the term for a small stone-lined grave box, typically constructed from thin slabs and sized to hold a crouched body or a cremation deposit. One of the three is well enough preserved to read clearly: a large capstone resting on two long side-stones and a single end-stone, the basic geometry of a box open at one end. The choice of a terrace position just below the crest is worth noting. Cairns are often found on prominent ridges where they would have been visible across a wide landscape, but a terrace setting like this one places the monument in a slightly more sheltered, intermediate zone, still elevated, still deliberate, but not quite announced to the horizon.