The site is known entirely through cropmarks, the subtle differential in how crops grow and ripen over buried features, where ancient ditches or banks beneath the soil cause the vegetation above them to behave differently from the surrounding ground. Seen from above at the right moment in the growing season, these variations resolve into patterns that would otherwise remain completely undetectable.

The evidence here consists of a rectilinear field system, meaning a network of boundaries laid out at roughly right angles to one another, the kind of organised agricultural landscape that speaks to deliberate, sustained land management rather than casual or temporary use. The site was identified from aerial photograph GB90.BY.06, and the record was compiled by archaeologist Geraldine Stout, with the entry uploaded in August 2011. Beyond what the photograph reveals, the precise date of the field system's origin and use is not recorded in the available notes; rectilinear systems of this kind can span a wide range of periods, from the prehistoric through to the early medieval, and without excavation it is generally not possible to be more specific.

Rogerstown lies in north County Dublin, close to the Rogerstown Estuary, a shallow tidal inlet that has long shaped land use in the area. Because the field system survives only as cropmarks, there is nothing to see at ground level; the site looks, to all appearances, like ordinary agricultural land. The best way to appreciate it is through the aerial photograph itself, which can be accessed via the relevant Irish archaeological archives. Visitors to the broader Rogerstown area may find more tangible interest in the estuary's wildlife, but for anyone with a curiosity about how landscapes are read and recorded, the idea that an entire organised field system lies quietly underfoot, legible only from the sky on the right summer afternoon, carries its own particular interest.