The uppermost feature is a sub-rectangular enclosure, modest in size at roughly eleven metres north to south and under five metres east to west, defined by a fosse, which is simply a cut ditch used to mark or defend a boundary. What makes the spot quietly arresting is not the enclosure itself but what it was built over: an earlier ditch barrow and a timber structure, both of which it effectively erased or ignored when it was constructed.

Excavations carried out by Doody over two months in the spring of 1982 revealed that the fosse was steep-sided and relatively narrow, just over a metre wide at the top and tapering to sixty-five centimetres at the base, with a depth of around forty-five centimetres. When the excavators worked through its fill, they found sandy silt threaded throughout with flecks of charcoal, suggesting burning activity in the vicinity at some point before the ditch silted up. Among the finds recovered from that same fill was a saddle quern, a type of flat stone used for grinding grain by hand, pushing or rocking a smaller stone across its surface. The presence of a quern in a ditch fill rather than a domestic context is not especially unusual; objects were discarded, pits were reused, and boundaries accumulated debris over time. But it adds a domestic, agricultural register to a site that otherwise reads as a sequence of territorial or ceremonial boundaries, one generation of marking simply overlaying another.