Ring-ditches are the ploughed-out or eroded remnants of prehistoric funerary or ceremonial monuments, most often the outer enclosures of burial mounds whose earthen bulk has long since been levelled by farming. What remains is the negative space, a circular trench whose slightly different soil chemistry causes the crops or vegetation above it to grow at a different rate, producing what archaeologists call a cropmark. At Skidoo, that cropmark is the primary evidence that anything was ever here at all.

The site was first recorded in May 1991, when aerial survey work captured it as a positive cropmark on photograph GB91.DM.26. The image, analysed by Gillian Barrett, revealed not just a single ring-ditch but two in close proximity, sitting on a low east-west ridge to the north of a stretch of the Broadmeadow river. The Skidoo example has an entrance causeway facing westwards, a detail that suggests deliberate orientation rather than casual digging. The south-eastern portion of the ditch has been lost to quarrying at some point in the past, and the outline of that quarry is legible both on the Ordnance Survey six-inch map and on the aerial photograph itself, giving the site a layered quality in which one form of destruction has been documented alongside the survival of what it damaged. The record was compiled by Geraldine Stout and updated by Christine Baker, with the entry uploaded in January 2015.

There is nothing to see at ground level. No earthwork, no stone, no marker of any kind is visible when you walk the field. The site is best appreciated through the aerial imagery available on Bing Maps, where the cropmark can still be made out on the low ridge above the Broadmeadow. For anyone interested in how prehistoric landscapes are recorded and interpreted in the absence of standing remains, Skidoo offers a useful case study in the limits and possibilities of aerial archaeology. The partial destruction by quarrying is a reminder of how much has been quietly removed from the Irish landscape before such survey methods existed to catch it.