In a field of reclaimed pasture in Ballyfauskeen, County Limerick, an earthwork was recorded once, from the air, and then effectively vanished. No ridge, no hollow, no trace of it survives at ground level today, and it never appeared on any of the historic Ordnance Survey Ireland maps that documented the Irish landscape across successive generations. Its existence is known almost entirely because an aircraft happened to pass overhead on a specific November day, decades ago.

The earthwork came to light through aerial photographs taken on 3 November 1984 as part of survey work associated with the Bórd Gáis Éireann Curraleigh West to Limerick gas pipeline. Aerial photography of this kind, flown at a scale of 1:5000 and catalogued as frame 370 in series 2611, has been responsible for identifying many features of the Irish archaeological landscape that are invisible at ground level, particularly cropmarks and soilmarks that only register from altitude under the right conditions of light, moisture, and vegetation. The site, recorded under the reference LI049-244, sits roughly 60 metres west of a local road, with a separate earthwork recorded 100 metres to the south-east. By the time Digital Globe and Google Earth orthoimages were examined, covering the period between 2011 and 2013, no surface remains were visible. The record was compiled by Martin Fitzpatrick and uploaded to the national monument database in October 2021.

For anyone hoping to visit, the honest answer is that there is little to see. The land is reclaimed pasture, which means any original topographic features have almost certainly been levelled and smoothed over the course of agricultural improvement. The value of the site lies not in what can be observed on the ground but in what it illustrates about the limits and the possibilities of the archaeological record itself, how much of the past is known only through a fortunate angle of light on a single autumn morning, and how much else may lie beneath fields that look entirely unremarkable from the road.