When surveyors working on the Ordnance Survey six-inch mapping recorded it in the nineteenth century, they noted it by name alone, without detail or elaboration. By the time anyone went to look more closely, in March 1983, nothing visible remained on the surface. No kerbing, no grave markers, no earthwork outline. Whatever was once here had been absorbed entirely into the surrounding ground.

The site sits within the south-eastern quadrant of a wider ecclesiastical enclosure, the kind of oval or roughly circular boundary that in Ireland typically marks an early medieval monastic or religious settlement. Such enclosures were often established between the sixth and twelfth centuries, and burial grounds associated with them frequently served local communities for generations after any religious activity had ceased. The place name itself carries the trace of what stood here: "Killeen" derives from the Irish "cillín", which can refer to a small church or, more specifically in later usage, to an unconsecrated burial ground used for unbaptised infants and others excluded from formal Christian burial. Whether that narrower meaning applies here is not certain, but the name preserves what the landscape no longer shows.