What was once a circular embanked enclosure, a low earthen ring of the kind used across prehistoric and early medieval Ireland to define space, whether for settlement, ceremony, or enclosure of livestock, now survives only as a ghost in the soil. When the field is ploughed, a circle of darker earth roughly eighteen metres across appears in the turned ground, the faint chemical signature of whatever once stood here.

The enclosure was recorded on the Ordnance Survey six-inch maps of both 1839 and 1924, which gives some sense of how recently it was still physically present in the landscape. The earlier edition noted an external diameter of around thirty metres; by 1924 the recorded measurement had grown slightly, to around thirty-five metres, a discrepancy that may reflect differences in surveying method or the gradual softening of the bank's edges over time. The site sat just off the crest of a south-west-facing slope, a position that would have offered both outlook and a degree of shelter. At some point between the mid-twentieth century and the present, the earthwork itself was levelled, most likely through repeated cultivation, leaving only that telltale dark circle behind.

Crop marks and soil marks of this kind are a recognised feature of Irish agricultural landscapes, where centuries of ploughing have reduced earthworks to near-invisibility while preserving the underlying evidence of disturbed or organically enriched ground. The circle at Racecourse is legible only under the right conditions, when fresh tillage catches the contrast between the feature's fill and the surrounding subsoil. It is the kind of site that asks something of the observer: patience, the right season, and an awareness that absence can itself be a form of record.