The monument comprises a group of 6 prehistoric burial cairns, five of which are of the chambered variety. Only four of the cairns are already scheduled, but the protected area is not adequate fully at each to protect them, hence this extension, which also adds the two cairns presently unprotected to the Schedule.
The cairns stand on high moorland at the N end of Warehouse Hill. The southern pair are about 85m apart on the summit of the high ground; more westerly is about 17m across with a central depression indicating the chamber. The more easterly is about 16m across, with a central chamber and E-facing entrance; under the circular cairn, and aligned roughly E-W, is a low sub-rectangular platform of large stones.
Standing on its own about 170m to the N is a single round cairn, about 12m across, with entrance and stalled chamber exposed.
The eastern group of three cairns (two large and one small) lie in a NE-SW line about 350m E of the single cairn, The smallest, at the SW end, is about 7m across and appears undisturbed. To the NE is a cairn of squarish plan, about 12m across, with a N-facing entrance passage and stalled interior. To the NE again, the third cairn is 10m across, circular on plan and apparently undisturbed, apart from a central depression that may mark the position of the chamber.
These cairns are of Neolithic or early Bronze Age date.
The area now to be scheduled is in three parts. Around the southern pair of cairns, an elongated area 133m long by 50m wide, with rounded ends; around the single cairn to the N, a circular area 50m across, and around the three cairns described last, an elongated area 100m long by 50m wide, with rounded ends. These areas include the cairns and an area around each in which associated structural remains and deposits are likely to survive, and are marked in red on the accompanying map extract.