At Deerpark in County Kildare, an entire archaeological feature exists in a form that can only be properly seen from the air. On the ground, there is nothing visibly remarkable about the field; the enclosure announces itself only as a cropmark, a phenomenon where buried ditches and banks cause the vegetation above them to grow at subtly different rates, producing ghostly outlines that become legible only from altitude.

The aerial photograph, taken in 1989 and catalogued as GB89.AG.32, captures the cropmark of a sub-circular enclosure defined by a fosse, that is, a broad external ditch typically associated with ringforts and enclosed settlements from the early medieval period and earlier. Alongside it, the photograph also reveals an adjacent ring-ditch, a circular trench that often marks the site of a prehistoric burial monument, possibly a round barrow. The proximity of these two features in the same field raises quiet questions about the long sequence of use this patch of Kildare ground may have seen, though without excavation, the relationship between them and their precise dates remain open.