From Hillforts Of The Wylye And Avon Valleys, by the Hillfort Study Group, Salisbury, April 1984:
Cley Hill Camp, Corsley
ST 839449
The site is situated on an isolated chalk knoll, steep-sided, on the north side of the Wylye valley. The defenses consist of a berm and considerable scarp on the north and west, with segments of counterscarp bank at the north-west corner. The area enclosed is some 7 hectares, though the exact nature of the south-west corner cannot be ascertained because of the very considerable disused chalk quarry which now occupies that area. In the absence of a good candidate elsewhere, it has been suggested that the original entrance to the fort was in this south-west corner. The rather more flimsy and indeed interrupted nature of the eastern side of the defenses led the Ordnance Survey field investigator to suggest that the hill fort may have been unfinished.
On this same eastern side are two terraces which begin on steep natural slopes near the bottom of the hill at the north end and which run on to meet the quarry at the southern end. While the opinion of Palmer is that these are unlikely to have been part of the hill fort defenses – he suggests the medieval strip lynchets – more recent air photographs seem to show this as an area of enclosure attached to the hill fort; the same photographs, taken in 1975-7 show extensive evidence of house platforms and pits, suggesting that the hill fort was not in fact unfinished.