They show up only from the air, rendered as faint rings in the crop, where the soil disturbed by ancient digging causes the plants above to grow differently from those around them. These are ring-ditches, each roughly ten metres in diameter, and they belong to a category of monument that is genuinely difficult to date or interpret without excavation. Ring-ditches are generally understood as the ploughed-down remains of burial mounds or small enclosures, the fosse, meaning the ditch, being all that survives once centuries of agriculture have levelled whatever earthwork once stood within.

The five enclosures were identified by Jean-Charles Caillère, who spotted them on satellite imagery, and their arrangement across the field is quietly telling. The group spans a considerable distance, with the two outermost examples lying roughly 280 metres apart, while two others sit almost side by side, separated by only about 25 metres. A fifth sits approximately in the centre of the scatter, giving the whole cluster a loose but coherent geometry that hints at some shared purpose or period of use, though what that was remains an open question. Cropmark evidence of this kind, where the buried negative features of a fosse become legible only through differences in vegetation, is among the most fragile and transient forms of archaeological visibility. The marks appear in dry summers when crops are under stress, and then disappear again, leaving no surface trace behind.