The ground itself is level and has been turned over for tillage, yet from the air, a network of cropmarks betrays a pattern of boundaries and enclosures that no longer exist in any visible form. Cropmarks appear when buried ditches or disturbed ground affect the growth of crops above them, producing tell-tale variations in colour and height that are invisible at ground level but legible from above. What they reveal at Ballyvodock is a field system whose internal logic runs almost entirely in a north-east to south-west direction, at an angle to the broadly north-south lines of the modern field that overlies it.

The earlier system is made up of a series of fosses, that is, ditches or trench-like boundaries, arranged in a roughly parallel sequence across the field. Near the north-east corner, one long fosse runs north-east to south-west, with two shorter fosses echoing its line further to the south, spaced somewhere between thirty and sixty metres apart. Towards the south-west of the same field, this network of linear boundaries wraps around a circular enclosure, now levelled into the earth, with fosses abutting it on both sides and one extending roughly thirty metres beyond it before meeting a third ditch cutting across. Further to the north-west of the enclosure, short lengths of fosse are connected by cross divisions, suggesting a more subdivided arrangement of land parcels. In the south-east quadrant, the alignment shifts slightly, and the boundaries begin to curve and interrupt one another in ways that hint at different phases of use or a distinct zone within the overall system. Taken together, the pattern suggests organised land management of some antiquity, with boundaries laid out according to an orientation that made sense in its own time rather than in ours.