It measures just 0.4 metres long and 0.73 metres wide, barely finger-thick at around five centimetres, yet cut into its surface is a small Greek cross, the kind with arms of equal length, each terminal flared into a wedge shape. What makes it quietly odd is that the cross sits off-centre on the stone, a detail that resists easy explanation and gives the slab a slightly unresolved quality, as if the carving were interrupted or placed by a hand working from a different logic than symmetry.

Inchagoill is one of the few inhabited islands in Lough Corrib and has two early medieval churches at its core: St. Patrick's Church and Templenaneeve. The trackway connecting them passes directly over this stone, which is now recumbent, meaning it lies flat rather than standing upright as it may once have done. It is one of three cross-inscribed stones documented on the island by Higgins in 1987, and this particular example sits just one metre from a second such stone in the same path. Cross-inscribed stones are among the earliest forms of Christian monument in Ireland, typically simple incised markings on local rock, predating the elaborate decorated high crosses by several centuries. Their precise function varies; some marked graves, some boundaries, some places of prayer or passage.