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Image from Archaeology Today From The Guardian: Unlike the giant boulders of monuments such as Stonehenge, the only evidence for most prehistoric timber structures is post holes in the ground. However in Norfolk, because the salty silt preserved the wood, the two circles at Holme Beach are the only ones in Britain to have been dated precisely, to 2049BC.In 1999, images went round the world of druids and other protesters chanting, weeping and trying to block the diggers from dragging the ancient timbers of Seahenge out of the silt and removing them from the beach.It was the eerie beauty of Seahenge, with the posts half submerged in the waves surrounding the upended stump of a giant oak tree, which made it international news. But the protesters who demanded it be left on the beach missed the second Bronze Age circle, just visible at the lowest tides.The circles were discovered at the same time, but while some of the conserved Seahenge timbers are now on display in the museum at Lynn, the other was never excavated.Norfolk county archaeologists monitoring its decay have just released the dating evidence, obtained by dendrochronology – counting the growth rings in the timbers – which shows it was built from trees felled in the spring or summer of 2049BC, exactly the same time as the Seahenge timbers.The tests were carried out over the last year, before decay would have made the dating impossible.Both circles were exposed because of their location on one of the fastest eroding coastlines in Britain.The 55 oak posts of Seahenge surrounded a gnarled oak stump, but the second ring, known as Holme II, was centred on two oak logs laid flat. . . .

Read more from Seahenge at Tea at Trianon