Measuring just 0.9 by 0.85 metres, it is framed by two upright slabs, two small corner pillars, and a couple of courses of flat stone. What makes it peculiar is its purpose. The dark soil filling it contained traces of human bone, and the current interpretation is that this modest enclosure functioned as a slab shrine, a place where disarticulated human remains were gathered and re-interred, possibly as a form of veneration for the dead of the surrounding early Christian cemetery.

The shrine sits at the same level as a series of lintel graves, a burial type in which stone slabs are laid over a body to form a simple covering, and it appears to have marked the western boundary and ceremonial focus of that primary cemetery. A sherd of Bii ware, a type of imported pottery associated with early medieval trade between Ireland and the Continent, was recovered from the upper fill, offering a broad dating context for the site's use. To the south of the shrine, excavators found two post-holes, each about 30 centimetres deep and set more than a metre apart, suggesting a vanished timber structure in the vicinity. The comparison drawn is with Church Island, where O'Kelly's 1958 excavation uncovered evidence of an early wooden oratory, a small prayer cell built before the more permanent stone structures that replaced such buildings across early Christian Ireland. The view northward from this elevated ground takes in Smerwick Harbour, which places the site within one of the most archaeologically layered landscapes on the western seaboard.