A semi-circular enclosure, defined by a fosse (a shallow ditch), exists here only as a cropmark, that faint but revealing discolouration in growing crops that appears from the air when buried earthworks affect the soil's drainage and fertility. You cannot walk up to it, read a sign about it, or trace its outline with your foot. It appears only when viewed from above, and even then only under the right conditions.

The feature was recorded as an enclosure in the Sites and Monuments Record in 1987, but its true character became clearer through aerial photography. A low-level photograph taken on 19 July 1971 captured it from the air, and a later image from 1989 confirmed the cropmark of the semi-circular fosse. Crucially, the same curved outline appears on the first edition Ordnance Survey six-inch map of 1839 and again on the 1900 revision, where it is shown as a semi-circular wooded enclosure. This alignment between the historic maps and the buried earthwork strongly suggests the feature is not an ancient monument in the conventional sense, but rather a remnant of deliberate demesne landscaping from the eighteenth or nineteenth century. Demesne landscapes, the designed grounds attached to landed estates, often incorporated ornamental tree plantings arranged in geometric or curved formations, used to frame views, mark boundaries, or simply signal the aesthetic ambitions of the landowner. What the cropmark outlines, in all likelihood, is the ghostly fosse that once defined just such a planting, long since cleared but leaving its impression in the soil below.