A single aerial photograph is sometimes all that stands between an ancient landscape feature and complete obscurity. In the case of a possible field system near Hybla in County Kildare, one image from the Geological Survey of Ireland's aerial collection caught what ground-level inspection could not confirm: roughly five short, linear earthworks arranged across a gently north-east-facing slope, with what may be a small rectangular enclosure sitting among them. A field system of this kind typically represents the organised division of agricultural land, the boundaries marked by low banks or ditches that accumulated over generations of use. What the photograph preserved in outline, the ground itself had already begun to lose.

When the site was visited in 1986, the field surface was noted as uneven but without any recognisable pattern or identifiable features. That unevenness, frustratingly vague as a description, may itself have been the last faint echo of the earthworks visible from the air. Since then, land improvement has levelled the ground surface further, and the traces recorded in the aerial image are no longer legible underfoot. A disused land-drain, roughly a metre wide and between thirty and sixty centimetres deep, cuts a dog-leg path through the area running north-west to south-east and then north-east, and spoil from a drained stream has been piled along the eastern edge of the site. These are the ordinary consequences of agricultural modernisation, the kind that quietly erase what centuries of use had quietly made.