That simple mark, cut into a stone roughly three-quarters of a metre tall and just over a third of a metre wide, is understood to be a cross-inscribed stone, a category of early medieval monument found across Ireland in which a cross form, sometimes abstract or stylised, was incised into a slab to mark or sanctify a burial. The inversion of the T-shape is the detail that catches the eye, quietly departing from the more symmetrical cross forms seen elsewhere.

The slab stands to the south-south-east of the ruins of Ballywiheen Church, also known as Teampall Bhaile Bhoithín, a simple rectangular church whose roofless walls survive near the eastern slopes of Croagh Marhin. The site, recorded under the placename Ceathrú An Teampaill, sits within a graveyard that has likely been in use across many centuries. The cross-inscribed stone was documented by J. Cuppage in the 1986 Corca Dhuibhne archaeological survey of the Dingle Peninsula, a thorough regional survey that catalogued the extraordinary concentration of early Christian and prehistoric monuments across this part of County Kerry.