Two upright parallel stones carry a capstone tilted slightly to the north, with a separate backstone near the western end that does not bear any of the capstone's weight. The whole structure is modest in scale, the north sidestone standing 1.5 metres high, the capstone measuring roughly 1.8 metres east to west, and the backstone comparatively thin at just 12 centimetres. What makes it genuinely unusual is not its size but its circumstances: a probable prehistoric tomb, if that is indeed what it is, occupying a position that would have been regularly inundated by tidal water.

The structure has divided expert opinion for decades. Writing in 1945, the archaeologist M. J. O'Kelly described it as a megalithic tomb of the simplest kind, a category that typically refers to a dolmen-like chamber formed by upright stones supporting a large flat capstone, and he was, in his own words, practically certain it was a genuine ancient structure. That confidence was not universally shared. The east-west orientation of the axis is considered unusual, and the location on the modern shoreline raises questions about whether the site could ever have functioned as a burial monument in its present position, or whether the land itself has changed significantly over time. Most problematically, the capstone was replaced at some point, introducing doubt about whether the current configuration reflects the original arrangement at all. By 1982, researchers Ruaidhrí de Valera and Seán Ó Nualláin concluded that the remains were not sufficient to include the site in their main catalogue of megalithic tombs in County Cork, effectively leaving it in a category of its own: probably old, possibly significant, but too ambiguous to classify with confidence.

The site sits on the southern shoreline of Poulnalibe creek near Rostellan, and its tidal position means access and visibility will depend heavily on when you visit. The stones themselves are not large by the standards of Irish prehistoric monuments, but in their contested, waterlogged setting they prompt a particular kind of uncertainty that more legible sites rarely offer.