Covering roughly 6.5 hectares, the rectangular features at Barnacoyle Little are modest enough that they register most clearly not underfoot but from the air, spotted on Ordnance Survey aerial photography and tentatively identified as the remains of an ancient field system.

Field systems of this kind are the fossilised outlines of past land management, boundary banks and divisions left by farming communities who cleared, parcelled, and worked the soil across centuries. The rectangular pattern here suggests deliberate organisation rather than natural accident, though the word "possibly" attached to the identification is an honest one. Without excavation, aerial evidence of low earthworks can only take interpretation so far. The site was brought to attention by Swan in 1996 and included in the Archaeological Inventory of County Wicklow published the following year, where it sits among a broader catalogue of earthwork remains scattered across the county's varied terrain.