What makes the site at Coolscart particularly unusual is not just its age or ambiguity, but the fact that it contains a second, distinct enclosure nested within it: a rectangular platform, very slightly raised above the level of the first, with its own surrounding fosse. A fosse, in this context, is simply a ditch dug around an earthen feature, often used for drainage, defence, or to mark a boundary. The combination of a circular outer enclosure with an internal rectangular element is an uncommon arrangement, and the relationship between the two forms remains unclear.

The monument was recorded by O'Kelly in 1942 to 1943, at which point it measured approximately 55 metres in overall diameter. Even then, the site had suffered considerably. Modern fences had been constructed across it in two directions, and by the time of the survey the western side of the rectangular inner platform had already been obliterated by one of these boundaries. The inner rectangle measured around 30 metres in length and, at the time of recording, had a maximum surviving width of just 9 metres. The original entrance to the enclosure could not be identified. Beyond those physical measurements and the note that the ground is marshy, the historical record is sparse. No name, period, or function has been firmly assigned to the monument.

The outline of the enclosure remains visible on Digital Globe aerial photographs, which is often the clearest way to appreciate earthworks that are difficult to read at ground level, particularly in wet or overgrown terrain. Anyone hoping to visit should be prepared for soft, boggy ground and limited access; the marshy low-land setting noted in the 1940s survey is unlikely to have changed significantly. Because the monument sits in agricultural land crossed by fencing, its boundaries on the ground can be hard to distinguish from the surrounding field systems. Aerial imagery, freely available through mapping platforms, is worth consulting before any visit.