At roughly 0.8 metres high, it is not a dramatic feature in the landscape, but its shape is particular: formed from the upcast soil of a U-shaped trench cut into the hillside, it has the tidy, deliberate appearance of something made rather than accumulated. The surrounding land is rough grazing, the kind of terrain where earthworks can persist for centuries without attracting much notice.

When the archaeologist O'Brien examined the site in 1970, the most honest conclusion available was that it was indeterminate. That classification is more interesting than it might sound. The combination of a cut trench and a mound built from the excavated material points to human intention, but the purpose behind that intention remains unclear. The feature was noted as having the appearance of a modern man-made construction, which only deepens the puzzle rather than resolving it. In a county where the archaeological record runs from megalithic tombs to post-medieval field systems, a site that sits outside easy categorisation has a quiet stubbornness to it.