Linear earthworks are among the more enigmatic categories of monument in Ireland. They may have served as boundaries between territories or land divisions, as cattle barriers, as markers of agricultural organisation, or as elements of defensive systems. Some are prehistoric; others are medieval. Without excavation or detailed survey, it is rarely possible to say which, and Cloonnagashel offers no easy answers.

The townland name itself gestures at something older. Cloonnagashel likely derives from the Irish, with cluain suggesting a meadow or pastoral area, the kind of low-lying ground where earthworks were sometimes constructed to manage livestock movement or demarcate grazing rights. Mayo has a long record of such landscape features, many of them still unexcavated and poorly understood, persisting quietly in fields and bog margins long after the purposes they served have been forgotten. This particular earthwork is recorded as a monument, which places it within the formal category of archaeological sites recognised under Irish heritage legislation, but the details of its dimensions, condition, and date remain, for now, unresolved in any publicly available form.