It appears on a map, and that is very nearly all that can be said about it. No local name was ever recorded for it, no folklore attached to it in any surviving document, and today there is no visible surface trace at all, only a south-facing slope of pasture where something once stood, or was at least believed to stand.

The sole documentary evidence is its appearance on the Ordnance Survey six-inch map of 1842, Ireland's first large-scale systematic cartographic survey, which recorded not only roads and townland boundaries but also antiquities scattered across the landscape. Surveyors working through Mid Cork in that period noted the stone at Mahallagh and marked it accordingly, though they gave it no name and left no accompanying description. Whatever the stone was, whether a prehistoric marker, a boundary point, or something else entirely, it made enough of an impression on someone in the early nineteenth century to be committed to paper. At some point between that survey and the present, it either fell, was buried, was removed, or was perhaps misidentified in the first place. The uncertainty itself is part of the record now.