In July 1989, an aerial survey captured something the ground itself conceals: a regular grid of cropmarks spread across roughly twelve hectares, the buried boundaries of an ancient field system showing up as subtle tonal variations in the growing crop above. Cropmarks of this kind form when buried features such as ditches or banks affect soil moisture and nutrients, causing the vegetation above them to grow differently, and in dry summers the effect can be dramatic enough to read from the air like a faint pencil sketch on the land.

What makes the Ballyhimock system particularly compelling is not just its scale but its orientation. The old fields sit on a completely different axis from the field boundaries in use today, a misalignment that suggests the landscape was reorganised at some point, with the earlier arrangement abandoned and eventually buried. The largest individual enclosure identified within the system measures approximately 125 metres by 125 metres, a substantial square plot by any era's standards. Clustered around the edges of this relict system are several other archaeological features: a ringfort, which is a roughly circular earthen enclosure typically associated with early medieval settlement and farming; a separate circular enclosure; and two fulachta fiadh, the latter being ancient burnt mounds thought to relate to cooking or industrial processes, found widely across Ireland and often dating to the Bronze Age. The grouping of all these features around a single field system hints at a locality that saw sustained and varied human activity across a long span of time.