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from the burning had given a pinkish tinge to the surrounding gravel.

A charcoal fragment from one of the posts in the inner palisade was radiocarbon-dated to the Late Neolithic. On this evidence the developers were able to grant a two-week extension to the excavation programme. A further 20 radiocarbon dates from the remains of other posts have shown that the palisades were constructed and used over a period of less than 460 years and possibly only a few decades. The dates imply that the two palisades were built between 25302310 cal BC and 2340-2100 cal BC.

Almost all the surviving carbonised posts were between 0.2m and 0.25m in diameter; the enclosure must, therefore, have been relatively uniform in appearance. Several postholes had shallower outer edges, perhaps evidence for the erection of the post. In some cases, adjoining slots contained identical fills, as if opened and backfilled together. Others, however, intercut each other. The cutting sequence ran in a

Above Left A pair of excavated post-holes from the same slot with evidence of burning in situat the top. Left Four excavated post-holes, being two pairs side-by-side, showing the spacing of timbers forming the double-palisade which ran around the edge of the enclosure. Below Aerial photo showing the two rings of double post-holes, representing an outer boundary of 1160 posts enclosing 2.75ha, and an inner one of 900 posts enclosing 1.8ha.

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