A circular enclosure, invisible to anyone walking the field, becomes legible only when seen from the air, appearing as a crop mark, a phenomenon where buried features influence how grass or grain grows above them, leaving ghostly outlines readable in certain lights and seasons. It is a reminder that the Irish landscape is full of structures that have never been excavated, catalogued in records but never fully examined.

The site, recorded in the Sites and Monuments Record as DU014-107, was identified through aerial photography and brought to wider notice through the work of T. Condit, who communicated details of the find. The circular form is accompanied by other features that may represent the remnants of a field system, suggesting that this was once a managed agricultural landscape rather than a single isolated structure. A second enclosure, recorded separately as DU014-105, lies nearby, hinting that this pocket of north County Dublin may contain a cluster of related activity from earlier periods of settlement. The record was compiled by David O'Connor and uploaded to the national database in November 2013, which means the site has been formally noted for just over a decade without, as far as the available record shows, any subsequent excavation or ground survey.

Because the enclosure is defined by a crop mark rather than any visible earthwork, there is little to see on the ground at any time of year. The best conditions for spotting such features from aerial vantage points tend to come during dry summers, when moisture stress reveals buried ditches or banks through differential growth in the vegetation above. The precise location within the Merryfalls townland is not publicly detailed in the available record, so anyone with an interest in visiting would do well to consult the National Monuments Service maps online, where the SMR numbers can be plotted, before making the trip. The surrounding area is ordinary-looking farmland, which is rather the point; nothing about it signals that the outlines of an ancient enclosure are waiting just below the surface.