What makes this grouping quietly unusual is that one of the three was, for a time, not recognised as a separate monument at all. On closer examination it proved distinct from its neighbour, a low sub-circular mound measuring roughly eleven metres north to south and six metres east to west, rising just half a metre above the surrounding ground. A fulacht fia, to give the form its Irish name, is a prehistoric cooking place, typically consisting of a mound of fire-cracked stone accumulated beside a water trough. The trough here measures three metres by two, sits about twenty centimetres below the top of the mound, and opens to the west.

All three sites are grassed over and threaded with reeds, their mounds composed largely of shattered red sandstone, the material heated, dropped into water to bring it to the boil, and discarded once it fractured beyond use. That accumulated debris is what eventually builds the characteristic horseshoe-shaped mound around the trough. The marshy character of the field, low-lying and hemmed in by ridges, would have suited the original users well enough; proximity to standing or slow-moving water was a practical requirement. The Lee Valley survey conducted by Michael Connolly in 1996 and 1997 recorded these three monuments together, and it was that careful fieldwork that separated this particular site from what had appeared, at first glance, to be a single larger feature.