Megalithic tombs are communal burial structures built from large stones, typically during the Neolithic period, and they survive across Ireland in various forms, from the long, gallery-like court tombs to the more compact portal tombs and passage tombs. The example at Mountaincommon belongs to this broad and ancient tradition.

The principal scholarly record for this tomb comes from Ruaidhrí de Valera and Seán Ó Nualláin, whose Survey of the Megalithic Tombs of Ireland, Volume II, covering County Mayo, was published by the Stationery Office in Dublin in 1964. De Valera and Ó Nualláin spent years systematically documenting Mayo's prehistoric monuments, and their survey remains a foundational reference for anyone trying to understand the distribution and character of megalithic architecture across the county. Mayo has a particularly dense concentration of such tombs, reflecting both the suitability of the landscape for Neolithic settlement and the relative durability of stone construction over millennia of change.