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Seahenge, which is also known as Holme I, was a prehistoric monument located in the village of Holme-next-the-Sea, near Old Hunstanton in the English county of Norfolk. A timber circle with an upturned tree root in the centre, Seahenge was apparently built in the 21st century BCE, during the early Bronze Age in Britain, most likely for ritual purposes. The site consisted of an outer ring comprising fifty-five small split oak trunks forming a roughly circular enclosure around . 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 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. Although the henge's existence had been common knowledge amongst locals for several decades, Seahenge received its name from the press in 1998, who named it after the more famous prehistoric structure Stonehenge in Wiltshire, and was picked up by the local and national media, inducing a great deal of publicity around its excavation. This was only increased due to the protests held against the excavation by both locals, who wanted it to remain as a tourist site, and Neopagans, who believed that the removal of the structure was an insult to the religious beliefs of its original builders. == Construction == Seahenge was constructed during the Early Bronze Age, a period of time that saw the increasing adoption of agriculture and sedentary living in Britain. Using a variety of scientific techniques, archaeologists have come to the conclusion that the trees used in the construction of the monument had all been felled in the same year, 2049 BCE,〔Dendrochronological evidence provided by Cathy Groves indicated that the trees had to have been felled in either 2454 BCE, 2049 BCE or 2019 BCE whilst radiocarbon dating displayed a date range of between 2200 BCE and 2000 BCE for their felling. Using Bayesian estimation, however, an English Heritage team led by Dr Alex Bayliss combined the dendrochronological and radiocarbon dates to reveal that the trees had been felled in the year 2049 BCE.〕 whilst the condition of the sapwood indicated that it had been cut down in spring or early summer.〔Watson 2005. p. 62.〕 According to writer Charlie Watson, "Confirming that all the trees had been felled at the same time suggested strongly that the building of the circle was a single event. Further, a great amount of work would have been involved in felling, transporting, preparing and erecting the timbers, so it was likely too that the job was done by a large number of people - possibly an entire community or an extended family - working together."〔 Those constructing the monument made use of at least fifty different bronze axes,〔The fact that over fifty different bronze axes were used in the construction of Seahenge was discovered through 3-D imaging which allowed archaeologists to measure the exact axe curvature and width of each blade that had made a cut in the timber. This revealed that 59 different blades had been used.〕 which were used to shape the timber to the desired lengths and shapes, at a time when, archaeologists believe, bronze tools were still relatively rare and had only been introduced to Britain a few centuries before.〔Watson 2005. p. 63.〕 Seahenge was originally constructed on a salt marsh, and over the centuries the area became a freshwater wetland, as an offshore barrier grew up, preventing sea water from getting access to the area around the circle. This in turn allowed alder trees to grow in the area, which eventually created a layer of peat above the mudflats. With rising sea levels in later millennia, the sea advanced, and eventually sand began to cover the peat. Through this process, Seahenge eventually found itself from once being inland to being on the beach, where it was revealed by the eroding away of the sand and peat by the late 20th century, four thousand years since its original construction.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Seahenge」の詳細全文を読む スポンサード リンク
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