The term earthwork covers a broad range of constructed ground features, from prehistoric enclosures and burial mounds to field boundaries and defensive banks, and without further detail it is difficult to say precisely what this one represents. That ambiguity is itself the story here. Ireland's countryside is threaded with such features, many of them still awaiting the kind of documentation that would tell us who made them, when, and why.

Brodullagh is a small townland in Mayo, a county with a dense and varied archaeological record stretching back thousands of years. The broader region contains traces of Neolithic settlement, Bronze Age activity, and early medieval land use, and earthworks of all periods survive across the county in varying states of preservation. Some are the remains of ring forts, the circular enclosed farmsteads that were the most common form of rural settlement in early medieval Ireland. Others are earlier, associated with burial or ritual. Without specific documentation for this particular feature, it is not possible to say which category it falls into, or whether it fits neatly into any category at all.

What is clear is that the record exists, that the earthwork has been noted and given a place in the national inventory of monuments, and that the landscape around Brodullagh almost certainly holds more than is immediately visible to the casual eye.