Somewhere beneath the farmland near Kilkea in County Kildare, the outline of a complex ancient enclosure survives, invisible at ground level but legible from the air as a cropmark. Cropmarks form when buried ditches or walls affect how crops grow above them, leaving ghostly traces that only become apparent when viewed from altitude, particularly in dry summers when differential moisture in the soil sharpens the contrast. What the aerial photograph reveals here is not a simple circular enclosure of the kind found across Ireland, but something more layered and complicated.

The site shows a curvilinear enclosure defined by two widely spaced fosses, the term for ditches typically dug as boundaries or defensive features, with an entrance oriented to the west. To the north-west, the enclosure appears connected to a rectilinear field system, suggesting organised agricultural activity in the surrounding landscape. More intriguingly, a further trapezoidal enclosure, defined by its own broad fosse, appears to have been superimposed on the southern portion of the original. That kind of overlapping geometry points to reuse across different periods, where one community built on or over the boundaries left by an earlier one. The result is a palimpsest of activity, two distinct phases of enclosure sharing the same ground and partly overwriting each other.

Because the site exists only as a cropmark, there is nothing visible to a person walking the fields today. Its form and extent are known from a single aerial photograph, referenced as GB89.AG.20, and the details it preserves about the entrance, the double fosse, and the later trapezoidal addition are likely all that will be known about this place unless the ground is ever excavated.