In a field in Grangerosnolvan, County Kildare, the ground itself holds a faint circular outline that is invisible to anyone standing on it. It appears only from the air, rendered legible by a cropmark, the phenomenon whereby buried ditches or structures cause overlying crops to grow differently, producing patterns of slightly varied colour or height that can be read from above like writing on a page. What the aerial photograph reveals here is a ring-ditch, a roughly circular trench cut into the earth in prehistory, most commonly associated with burial or ceremonial activity.

An aerial photograph, referenced as GB96.FZ.23, captured this cropmark and identified the ring-ditch as one of a pair located in close proximity to one another. The pairing is significant. Ring-ditches appearing together in this way are not unusual across the Irish midlands and east, where aerial survey has gradually uncovered clusters of such monuments that ground-level inspection would never betray. They likely represent the remains of low burial mounds, sometimes called barrows, whose earthen mounds have long since been ploughed flat, leaving only the encircling ditch as a ghost in the subsoil. Whether the two at Grangerosnolvan were contemporary with one another, or belong to different phases of activity across a landscape already considered significant, is something the cropmark evidence alone cannot settle.