It is not quite a conventional ringfort, not quite a field boundary, and not quite anything a visitor might expect to find at nearly a thousand feet above sea level on rough upland grazing. Its D-shaped plan, with a flattened side rather than the circular form typical of lowland ringforts, a cashel is the term used for a ringfort built from stone rather than earth, gives it an ambiguous quality that caught the attention of scholars more than a century ago.

Thomas Johnson Westropp, writing in 1901 and again in 1915, noted this site as part of what he called a "curious group of ring walls" on the mountain, and grouped it among sites he considered "late folds", suggesting a function connected with livestock management rather than domestic settlement. The enclosure itself measures roughly 16 metres north-east to south-west and just over 14 metres north-west to south-east, defined by a stone wall that survives to between 0.6 and 1.4 metres internally and around a metre externally, with a thickness of up to 1.8 metres in places. The interior slopes downward toward the east and south-east. Attached to its south-eastern edge is a further D-shaped field, approximately 33 metres across, with a straight eastern side running about 30 metres. At the eastern end of that field sits a small rectangular drystone pen, just 6 metres by 2 metres, with two upright stones marking an entrance on its northern side. This modest structure, almost certainly used for penning animals, reinforces Westropp's reading of the whole complex as a pastoral rather than a residential one. A related enclosure lies roughly 30 metres to the south-south-west. The entire arrangement appears within a large field system on the mountain, and the site was already recorded on the first Ordnance Survey six-inch map of 1842, with its presence confirmed again on the 1915 Cassini edition.