Beneath the grass, cut through at its northern and south-south-eastern edges by that modern division, lies the faint outline of a rath, the circular earthwork enclosure that was the standard unit of rural settlement in early medieval Ireland, typically serving as a defended farmstead for a single family. This one is roughly 34 metres in diameter, circular in plan, and by most measures barely there at all.

A rath of this kind would originally have been defined by a raised earthen bank, possibly with an outer ditch, enclosing a domestic space where a household lived, kept livestock, and stored food. At Grange More, what survives is a low scarp on the western side of the field boundary, a slight change in ground level that rewards careful looking. To the east, even that much has largely disappeared, leaving only very slight traces. The field boundary that bisects the site is an intrusion of uncertain age, though its north-north-east to south-south-west alignment cuts cleanly across what would once have been an unbroken circuit. It is the kind of accidental archaeology that turns up across rural Ireland, where the demands of working land have, over centuries, quietly dismantled what earlier inhabitants built.