In a field in Kilmurry, County Kildare, a circular outline roughly thirteen metres across has been quietly waiting in the soil, invisible at ground level and only legible from the air. It shows up as a cropmark, the kind of subtle ghost-image that appears in aerial photography when buried archaeology causes the vegetation above it to grow differently, typically greener and lusher over a ditch, or paler and more stressed over a compacted bank. From above, the circle resolves clearly; from the ground, there is nothing to see at all.

The feature was identified in aerial imagery captured on 28 June 2018 and subsequently compiled by Caimin O'Brien, working from details provided by Edward O'Riordan. The circular form suggests a prehistoric or early medieval enclosure, possibly the remains of a barrow, which is a burial mound, or of a ringfort-type enclosure, though without excavation it is impossible to say which. A diameter of around thirteen metres is consistent with smaller monument types in either category. The date of the imagery, late June, is telling: cropmarks of this kind tend to appear most sharply during dry summer conditions, when plants rooted in disturbed or compacted soil show stress before those in undisturbed ground do. The timing of the photograph may well be what made this feature visible at all.