That is, in a sense, the point. A small oval earthwork once sat just above a cliff-like rocky outcrop near the hilltop, enclosing an area roughly twenty-five metres north to south and twenty metres east to west. It was mapped once, on the Ordnance Survey's six-inch sheet of 1838, and then it quietly vanishes from every subsequent edition, removed during land reclamation at some point in the intervening years. At ground level today, no trace remains.

What makes this enclosure quietly unusual is the way it sat outside the familiar categories of Irish field antiquity. An embanked enclosure of this kind would ordinarily invite comparison with a rath, the circular or oval earthen ringfort that served as a farmstead enclosure in early medieval Ireland, and which is deeply embedded in local tradition across the country as a fairy fort or simply a fort. At Knocknaskeagh, local knowledge was specific on this point: the feature was not remembered as a fort or rath at all, but as a small garden field, about twenty feet across. Whether that memory reflects the structure's actual function, or simply the community's distance from whatever original purpose it served, cannot now be resolved. The commercial quarry that now operates to the west of the site adds a further layer of erasure to a landscape that had already moved on.