That much is certain. Beyond the name and the map reference, the record is presently silent, which in its own way says something about how much of Ireland's landscape archaeology remains catalogued but not yet described, noted but not yet explained. Earthworks of this kind can take many forms, from the low, grassy banks of a ringfort, one of the enclosed circular settlements that dot Irish fields in their thousands, to the remnants of a field boundary, a burial mound, or something more ambiguous that has yet to be formally interpreted. Clare has no shortage of any of these.

The county sits on the limestone of the Burren in its north and gives way to softer, more varied terrain further south, and both environments have preserved earthworks in different ways. Limestone country can hold the outline of ancient enclosures with unusual clarity, while the damp lowlands tend to absorb and obscure. Without more specific detail attached to this particular site, it is difficult to say more than that something human-made once shaped the ground at Glen, and that shape has lasted long enough to be recorded.