No earthworks protrude above the surface, no stones mark the boundaries, and the site does not appear on any Ordnance Survey historic map. What gives it away is something far more subtle: the way crops grow differently over buried features, producing faint variations in colour and height that only become legible from the air.

The field system at Ballyphilip first came to light during the Bruff aerial photographic survey of 1986, when analysts identified four roughly parallel, slightly curvilinear cropmarks running across the ground. Cropmarks form when buried ditches, walls, or soil disturbances affect the moisture and nutrients available to plants above them, causing those plants to grow taller or shorter, greener or paler, than their neighbours. A single aerial photograph taken on the right day can reveal centuries of activity invisible from the ground. Later ortho-imagery, including Ordnance Survey images captured between 2005 and 2012 and a Google Earth image from March 2017, showed the picture to be considerably more complex than the 1986 survey had suggested. At least nine roughly parallel linear cropmarks, each running on a NNW-SSE alignment and extending approximately 300 metres in length, are now visible across an area of at least 16.5 hectares. The site sits within a large complex of ring-barrows, which are circular burial monuments typically defined by a central mound or flat area enclosed by a ditch and outer bank, suggesting the landscape here has a long and layered history of human use. The field system itself has not been dated, and without excavation its precise period remains unknown.

Ballyphilip is working farmland, cut through by land drains and watercourses, and there is nothing on the surface to indicate what lies beneath. The features compiled by Alison McQueen and Vera Rahilly, uploaded to the record in September 2020, are best appreciated through the aerial and satellite images associated with the survey rather than by any ground-level visit. Anyone with an interest in aerial archaeology can examine the Google Earth orthoimage from March 2017 alongside the Bruff survey image to trace the pale lines resolving slowly into a pattern of ancient boundaries, most legible when seasonal conditions have stressed the vegetation just enough to make the buried past briefly readable.