It is a fulacht fia, one of the most common prehistoric monument types in Ireland, yet one that still generates genuine debate about what these sites were actually for. The name, loosely translated as "cooking place of the deer" or "wild deer roast", points to one long-held interpretation, though archaeologists have also proposed that these sites served as brewing vessels, hide-tanning troughs, or communal bathing facilities. Whatever their purpose, the basic mechanism is well understood: a trough, usually timber-lined and filled with water, was heated by dropping fire-cracked stones into it. The discarded, heat-shattered stones accumulated over time into the characteristic horseshoe-shaped mounds that survive across the Irish countryside.

Fulachtaí fia are typically dated to the Bronze Age, with many sites clustering between roughly 1500 and 500 BC, though some examples have earlier or later activity. They tend to appear near water sources, which makes practical sense given the volume of water required to fill a working trough. The Ross example is one of many such monuments recorded across Mayo, a county whose boggy, low-lying ground has helped preserve these otherwise fragile earthworks. The burnt mounds are often a dark, peaty colour, stained by the charcoal and organic residue of repeated use, and many were only identified as archaeological sites relatively recently, having been dismissed for generations as natural features or field clearance heaps.