By 1842, when the Ordnance Survey produced its six-inch map of the area, both the church and its accompanying graveyard were already recorded as ruins within that enclosure. Today, no visible trace of the church itself remains at all, which gives the site a particular quality: the landscape holds the memory of a building that has entirely dissolved back into it.

The 1842 OS six-inch map is a useful marker here, because it captures the site at a moment when the ruins were at least still recognisable as such. The enclosure boundary, a feature that would have defined the sacred precinct of an early medieval religious community, was recorded alongside them. Early ecclesiastical enclosures of this type are found throughout Ireland and often indicate a foundation with roots in the early Christian period, sometimes associated with a local saint or monastic community, though no such specific detail survives in what is known about Kilmona. The graveyard, as is common at such sites, likely continued in use long after the church fell out of use or into decay, which is frequently how these places persist in the landscape even when the architecture is gone entirely.