The site consisted of an outer ring comprising fifty-five small split oak trunks forming a roughly circular enclosure around 7 m by 6 m. Rather than being placed in individual holes, the timbers had been arranged around a circular construction trench. Their split sides faced inwards and their bark faced outwards (with one exception where the opposite is the case). One of the trunks on the south western side had a narrow Y fork in it, permitting access to the central area. Another post had been placed outside this entrance, which would have prevented anyone from seeing inside. The timbers were set in ground to a depth of 1 m from the contemporary surface although how far they originally extended upwards is not known. In the centre of the ring was a large inverted oak stump.
It is possible to date the creation of Seahenge very accurately through dendrochronology since the rings on the trees can be correlated with other overlapping tree ring variations; the date of felling the oaks was found to have been in the spring or summer of 2049 BC. The upturned central tree stump was 167 years old when it was felled. Between 16 and 26 different trees were used in building the monument with palynological evidence suggesting they came from nearby woodland. Analysis of axe marks on the timbers indicates that at least 51 different axes were used in working the timbers. The largest axe was used to cut the central tree and not any of the other timbers. The excavators interpret each unique axe as representing a different individual, and thus consider it likely that Seahenge was a community endeavour. Holes in the central stump indicate that it was pulled onto site by rope. Pieces of the rope, made from honeysuckle stems, were found under the stump.
The site was discovered because of the actions of the tide on Holme Dunes, which is gradually wearing away the peat layers to reveal the landscapes laid down many thousands of years ago. In this instance the wooden posts and stump had been preserved in the peat and were revealed at low tides. Since the entire structure had been in an anaerobic waterlogged state for several thousand years, the logs had survived with little damage. In the early Bronze Age, the site was probably a saltmarsh environment, between the sea and the forest before the ocean encroached to form the modern coastline. Tidal action had scoured away overlying sediment which had built up in the intervening centuries revealing the timbers for the first time since prehistory. (Wikipedia)
