A midden is, in essence, a refuse heap, an accumulated deposit of shells, bones, ash, and discarded domestic material left by people who once ate, worked, and lived nearby. What looks like rubbish to the untrained eye is, to an archaeologist, a layered record of diet, season, and settlement stretching back centuries or, in some coastal cases, millennia.

The western seaboard of Ireland is particularly rich in shell middens, many of them associated with communities who depended on the sea for a substantial part of their food supply. Cockles, oysters, periwinkles, and limpets were gathered from the foreshore and consumed in quantity, their shells tossed aside in accumulations that can survive in the ground long after timber, thatch, and even bone have decayed. In Connemara, where the Atlantic inlets and tidal flats provided reliable shellfish beds, such deposits are a natural feature of the archaeological landscape. The specific history of the Mweeloon midden, its date, extent, and the people associated with it, remains to be fully documented and made publicly available.