Enclosures of this kind are among the most common yet most ambiguous monument types in the Irish archaeological record. They can date from the Bronze Age through to the early medieval period, and their purposes vary considerably: some were farmsteads, their circular or oval banks defining a domestic space and protecting livestock; others may have had ritual or ceremonial functions. Without further detail, the enclosure at Greaghans keeps its own counsel.

The townland name Greaghans derives from the Irish, generally understood to refer to a marshy or gravelly place, which hints at the kind of terrain these early communities often chose to inhabit and manage. Mayo as a county contains an extraordinary density of such earthwork monuments, many of them surviving because the land around them was never intensively ploughed or developed. That survival is itself a kind of accident, the result of marginal ground being left alone long enough for the archaeology beneath and within it to endure. What exactly the Greaghans enclosure represents, who built it, and when, remains a question that the available record has not yet answered in full.