That much is certain. Beyond the bare fact of its existence and its location, the record falls quiet, which is itself a kind of information. Earthworks of this kind, a broad category covering everything from prehistoric enclosures and field boundaries to medieval ringforts and later agricultural banks, are scattered across the Irish midlands and west in their thousands, many of them surveyed but not yet fully documented, sitting in fields and hillsides without interpretation or signage, noticed mainly by those who already know what they are looking for.

Toonagh lies in the barony of Tulla Upper, a part of Clare that was well settled in both the early medieval and prehistoric periods, though without specific detail about this particular earthwork, its age, its function, and its builders remain open questions. The very ambiguity places it in good company. Many earthworks in Ireland resist easy classification even after excavation; the landscape simply holds them, grass-covered and patient, outlasting most attempts at certainty.