When soil above buried ditches dries at a different rate from the surrounding ground, growing crops register the difference in their colour and height, and from altitude those contrasts resolve into the outlines of vanished structures. A single aerial photograph, taken on 16 July 1971, captured exactly this effect at Kilcreen, revealing a grid of field boundaries aligned roughly NNW-SSE and ENE-WSW, the ghostly geometry of a former agricultural system now lost beneath the plough.

The same photograph disclosed something more complicated beneath that grid. Two ring-ditches also appeared as cropmarks, along with what may be an enclosure. Ring-ditches are the subsurface traces of circular monuments, often prehistoric burial mounds whose above-ground material has long since been levelled. The relationship between these features and the later field system is where the site becomes genuinely interesting. One of the field ditches running NNW-SSE passes along the eastern edge of one ring-ditch and directly through the centre of the other, while the ENE-WSW boundary cuts across the enclosure. The implication is clear: whoever laid out those field boundaries did so without regard for what lay beneath, or perhaps without knowing it was there at all. The field system post-dates the ring-ditches and the enclosure, though by how much remains an open question. Prehistoric monuments overlaid by later agricultural activity is a pattern found across Ireland, but the precise stratigraphy captured here in a single aerial frame makes Kilcreen an unusually legible example of that long process of landscape reuse.