Across a stretch of very low-lying land, cut through by drainage channels, aerial photographs captured in 1971 reveal a faint but legible geometry: a series of linear trenches and curving low earthworks pressed into the soil, visible from above in a way they never quite are from the ground. The suggestion, and it remains a suggestion, is that these marks are the residue of a medieval open field system, the kind of communally organised agricultural landscape that once covered large parts of Ireland and Britain but has largely been erased by later land use.

A medieval open field system typically involved strips of arable land managed collectively by the inhabitants of a settlement, with boundaries defined by low ridges, furrows, or drainage cuts rather than walls or hedges. At Silloge, the aerial record, reference FSI 2.411/10, offered the first clear indication that such an arrangement might once have existed here. Decades later, a geophysical survey carried out under Licence no. 07R156, in advance of proposed development in the area, added a layer of ambiguity rather than clarity. The survey identified subtle subsurface responses and trends consistent with past agricultural activity, and probable drainage features were confirmed, but the technology could not determine how old any of it was. The medieval interpretation remains plausible but unproven.

Silloge sits in the suburban northside of Dublin, and the landscape around it is thoroughly ordinary to the passing eye, flat, drained, and unremarkable in the way that former wetland margins often are. There is no monument here in any conventional sense, no visible earthwork that would draw the eye of a casual walker. The interest lies almost entirely in what the aerial photographs from 1971 recorded, and in the way that low-lying ground on the edges of settlement so often turns out to carry older patterns beneath its surface. Anyone curious enough to seek it out would do well to look at the aerial record first, since the landscape as it stands offers very little to read without that prior context.