What makes them quietly curious is how precisely they were once described, and how little has been confirmed since.

The Ordnance Survey Letters, compiled in the 1830s and later published by O'Flanagan in 1928, recorded both buildings with careful measurements. The southerly structure ran north-west to south-east, 42 feet long and 12 feet broad, with four stones marking the foundation of its south-eastern gable. Immediately to its north sat a second building, oriented north to south, 30 feet long by 12 feet wide, with two stones indicating its northern gable end. The OS Letters were a systematic effort by Ordnance Survey officers to gather historical, topographical, and antiquarian detail about Irish townlands as they mapped the country, and they preserve observations that would otherwise have gone unrecorded entirely. One of these two structures at Kilmurry Green was tentatively identified as a church, though the identification was not settled. By the time the site was inspected in 1990, only one structure could be noted, suggesting either that the second had become further obscured, or that the two had always been less distinct on the ground than on paper.