This early Christian monument, measuring 72cm tall and 36cm at its widest point, tapers gently from its lopsided gable top down to its base. The slab itself is quite thin at just 5cm thick, and stands oriented at 200 degrees, or about 20 degrees west of south, positioned at the eastern end of a stone structure built against the oratory's north wall.

The most striking feature of this ancient marker is the Latin cross carved into its western face, which dominates the upper half of the stone. Standing 33cm tall with arms spanning 27cm across, the cross displays the distinctive expanded T-bar terminals characteristic of early Irish Christian art. These terminals, particularly those on the horizontal arms, feature convex outer edges that give the cross a sense of movement and grace despite being carved from solid stone.

First documented by Walsh in 1983 and later described in detail by Herity in 1995, this cross-slab represents the kind of unassuming yet significant monuments that dot the Irish landscape. Its placement within the oratory suggests it held special significance for the community that worshipped there, possibly marking a grave or serving as a devotional focus. The careful positioning and enduring craftsmanship speak to the importance these early Christian communities placed on creating lasting symbols of their faith, even in this remote corner of Donegal.