A fulacht fia is a burnt mound, typically Bronze Age in origin, formed over centuries of repeated use: stones were heated in a fire, then dropped into a water-filled trough to bring it to a boil, shattering in the process and accumulating into the characteristic crescent or horseshoe shape that survives today. The opening in this particular mound faces west, which is where the original trough would have sat, fed, in all likelihood, by the stream running alongside the field.

The mound measures roughly 10.4 metres along its longer axis and stands no more than 0.7 metres at its highest point, which gives a sense of how easy it would be to walk past without registering what it represents. What makes the site quietly more interesting is that another probable fulacht fia lies just one metre to the south, suggesting this was not a single isolated episode of use but possibly a location returned to, or used in parallel, over time. Such clustering is not unusual with burnt mounds; they tend to appear near reliable water sources, and a stream nearby would have made this corner of a Mayo field a practical and repeatedly attractive spot.