The stone is known as Leacht Mic Maithin Iorrais, meaning the Monument of McMaheen of Erris, and the claim attached to it gestures at something specific: a dwelling so far out on the Atlantic edge that nothing lay beyond it but open water.

The 1838 Ordnance Survey six-inch map marks the slab in the south-western corner of the graveyard, naming it Leaght Mc. Maheen, and the OS Letters of that same year record the tradition about McMaheen and his westerly house in careful detail. By the 1921 edition the designation had shifted to the more prosaic Tombstone (on Site of) Kilbeg Grave Yd., a sign that memory of the stone's significance was already fading. When the scholar Henry examined it in 1937, the slab was still largely intact, though half-buried. Dug out, it measured roughly 0.76 metres of carved surface, 0.4 metres wide and only about 0.05 metres thick. Two crosses were carved on its western face, set one above the other within circles that stretched the full width of the stone. The upper circle enclosed an equal-armed cross with slightly expanded terminals; the lower enclosed a cross of arcs, a form in which the arms of the cross curve outward rather than running straight. Both designs belong to a tradition of early medieval Irish cross-slab carving, where incised geometric forms served as grave markers or commemorative monuments. By 1995, the slab had been broken into three pieces and at least one fragment had disappeared entirely. The carving, already weathered, had deteriorated further, leaving only faint traces of the lower cross visible to the eye.