Most of the 168 post holes held wooden posts, although Cunnington found evidence that a pair of standing stones may have been placed between the second and third post hole rings. Recent excavations in 2006 have indicated that there were, in fact, at least five standing stones on the site, arranged in a "cove". The deepest post holes measured up to – and are believed to have held posts which reached as high as above ground. Those posts would have weighed up to 5 tons, and their arrangement was similar to that of the bluestones at Stonehenge. The positions of the postholes are currently marked with modern concrete posts – a simple and informative method of displaying the site.
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