We know about it only through Thomas Fagan’s account from 1846, written years after locals had already dismantled the structure. According to Fagan’s informants, it was a cairn built from white stones containing several stone coffins with human remains; one coffin allegedly held a complete skeleton accompanied by what was described as a ‘brass hatchet’. The monument stood on John Stewart’s land, adjoining the western side of the north;south road through the townland, roughly 150 metres west of Site A, a known cruciform passage tomb in the area.

The exact nature of this lost monument remains tantalisingly unclear. Its proximity to a small cluster of passage tombs suggests it might have been another passage tomb itself, though some scholars have interpreted Fagan’s description as possibly referring to a cemetery mound containing cists. Land valuation records from around 1857 show that Stewart’s holding extended along both sides of the road for about 170 metres, helping archaeologists narrow down the monument’s probable location. Seán Ó Nualláin suggested in 1968 that a slight mound about 90 metres north of another site might mark its location, though this seems unlikely as it falls outside what would have been Stewart’s property boundaries.

Archaeological testing carried out in July 2005 ahead of agricultural development work revealed little of significance in the immediate area, though the proximity to the Kilmonaster Passage Tomb cemetery meant careful investigation was required. The testing, which involved excavating three trenches near a proposed containment tank just five metres from an existing passage tomb, uncovered only modern pottery sherds, a single worked flint in the topsoil, and some animal bones from livestock burials along an old field boundary. While the lost monument described by Fagan remains elusive, its story adds another layer to our understanding of this archaeologically rich landscape where Neolithic communities once built their elaborate tombs for the dead.