Look more carefully and the geometry becomes deliberate: two upright stones to the north, a single stone to the east, a covering roofstone laid across them, and faint traces of the mound that once surrounded the whole structure. The chamber measures roughly 1.8 metres in length, which is modest even by the standards of megalithic tombs, the collective term for the stone-built burial monuments raised across Ireland and western Europe during the Neolithic and Bronze Age periods.

Precisely what kind of burial chamber this is remains an open question. Researchers Ruaidhrí de Valera and Seán Ó Nualláin noted as far back as 1972 that the monument's exact classification was uncertain, though they were in no doubt it served a funerary purpose. A small stone at the western end is thought to have shifted from its original position over the centuries, and three further stones exposed to the southeast are likely natural outcrops rather than structural elements. That ambiguity, between what is built and what is geological, is part of what makes the site quietly difficult to read. The mound material that would once have enclosed and defined the chamber has largely dispersed, leaving only traces, which compounds the difficulty of assigning it to a specific tomb type such as a portal tomb or a wedge tomb.