It does not appear on Ordnance Survey Ireland's historic maps, it leaves no mark on the ground that a walker would notice, and yet aerial photography has caught it twice, each time in a slightly different form, like a patient thing revealing itself only to those looking from above.

The site, recorded under the National Monuments Service reference LI040-125----, was first identified not through any deliberate archaeological survey but as a byproduct of infrastructure work. When Bórd Gáis Éireann was routing the Curraleigh West to Limerick gas pipeline in the early 1980s, contractors commissioned a series of aerial photographs at a scale of 1:5000. The photograph marked 271, taken on the 3rd of November 1984, showed the outline of a rectangular earthwork lying roughly 100 metres to the east of another enclosure in the same field. An earthwork of this kind would originally have been defined by a bank and ditch, demarcating an enclosed space that might have served any number of purposes depending on its period, from a farmstead or stock enclosure to something with a more ceremonial function. When orthophotography returned to the area between 2005 and 2012, the shape had softened further, visible only as an L-shaped cropmark running from the north-east around through the east and down to the south. Cropmarks form when buried features affect how plants above them grow, with ditches tending to retain more moisture and producing lusher growth, and banks compacting the soil and doing the opposite. By the time Google Earth imagery was examined, nothing at all was discernible on the surface. The record was compiled by Fiona Rooney and uploaded to the national archive in June 2021.

For anyone visiting the Hammondstown area with this site in mind, expectations should be calibrated accordingly. There is nothing to see at ground level, and access to the surrounding farmland would require the landowner's permission. The interest here is less in what can be experienced on foot and more in what the archive preserves: the idea that a pipeline survey, conducted for entirely practical reasons four decades ago, accidentally documented something that has since slipped even further from view. If you are curious about the aerial photograph itself, the BGE image marked 271 is referenced in the national monument record, and the Sites and Monuments Record for County Limerick is the place to begin.