Megalithic structures, a broad category covering anything from portal tombs and passage tombs to stone alignments and court cairns, were typically raised during the Neolithic or Bronze Age, often as communal burial monuments or as markers tied to seasonal or astronomical cycles. The people who built them worked without written language, which means the stones themselves are frequently the only evidence that they were ever there at all.

Beyond its classification and location, the details of this particular structure remain largely undocumented in any publicly accessible form. What can be said is that Mayo has a notable concentration of megalithic remains, partly a consequence of the thin upland soils that made later agricultural disturbance less thorough than in lowland areas. Knockfadda itself, the name deriving from the Irish for a long hill, suggests a topography that would have held meaning for prehistoric communities choosing where to mark the land permanently.