It belongs to a category of monument that could mean almost anything: a raised enclosure, a boundary bank, a collapsed ringfort, a field system of indeterminate age. Earthworks of this kind are among the most common archaeological features in the Irish countryside, and also among the most quietly ambiguous. Without excavation or detailed survey, many remain little more than a shape in a field, their origins somewhere in the broad span between the Bronze Age and the early modern period.

Knockeeragh is a Mayo townland, and Mayo as a county holds an extraordinary density of such features, many of them still unexamined in any depth. The broader landscape of the west of Ireland preserves earthworks that elsewhere were long ago levelled by intensive agriculture, which means that what survives here sometimes survives almost by accident, simply because the land was never ploughed hard enough or often enough to erase it. Beyond the fact of its existence and its location, the particular history of this earthwork remains, for now, unrecorded in any publicly available form.