One end of the roughly rectangular stone, which measures just over a metre in length, bears a large shallow oval depression; the other carries a deeply incised L-shape, cut to a depth of around two centimetres and now furred with moss. The tradition recorded alongside this stone holds that the depression marks where the saint sat, and that the L-shaped groove is the impression left by his pipe, which gives the site an appealing, unhurried quality quite unlike the grander Patrician monuments elsewhere in the west of Ireland.

When Ordnance Survey officers were working through this part of Mayo in 1838 and recording local knowledge in what became the OS Letters, they noted a second symbol beside the L-shaped incision, a T-shaped carving described as smaller, shallower, and more finely worked than its companion. That second mark is no longer visible. Its disappearance over less than two centuries is a reminder of how vulnerable shallow incisions in exposed stone can be, whether to weathering, grazing animals, or simply the slow accumulation of soil around a slab that is, even now, partly embedded in the ground. The slab is oriented roughly northwest to southeast, with its broader end, where the oval depression sits, pointing towards the southeast. Immediately to its east lies a separate cross-inscribed stone, and not far beyond that, in the same field, is a ringbarrow, a low circular earthwork of the kind typically associated with Bronze Age burial. The clustering of these features, along with a church and graveyard just across the road to the north, suggests a landscape that has been treated as significant across a very long stretch of time, long predating any Patrician association.