This from wikipedia & English Heritage.
Geophysical work by English Heritage in 1997 revealed a surrounding ditch and nine concentric rings of postholes within the stone circle. More than four hundred pits, 1 metre (3ft 3in) across and at 2.5 metres (8ft 2in) intervals, stood in rings at the site. The ditch is 135 metres (443ft) in diameter and about 7 metres (23ft) wide. A 40 metres (130ft) wide entrance was visible on the north-east side. No surrounding bank has been identified although the site awaits excavation.
The geophysical work transformed the traditional view of Stanton Drew as being a surface monument and the Great Circle is now seen as being one of the largest and most impressive Neolithic monuments to have been built. Analogous with the circles of postholes at sites at Woodhenge, Durrington Walls and The Sanctuary, it is thought that the pits would have held posts which would have either been freestanding or lintelled as they could not have supported a roof at that size. The postholes in nine concentric rings held posts up to 1 metre (3.3ft) in diameter indicating the use of ancient trees which were sacred to the druids.
Nearby and to the north-east is a smaller ring of eight stones in the centre of which the geophysical work identified four further pits. A third ring of twelve stones, measuring 43 metres (141 t) wide, stands to the south-west.
A fluxgate gradiometer survey in July 2009 investigated standing stones in the garden of the Druids Arms public house known as The Cove, which showed that the stones date from nearly a thousand years before the stone circles. The conclusion from the study was that these upright stones are likely to have been the portals or façade of a chambered tomb.
Just had a very enjoyable long weekend with my daughter, this was one of the
places we visited.
Probably late Neolithic to early Bronze Age: thought to date between 3000 and 2000 BC. I will post more in the next few weeks.
See this link from English Heritage: Stanton Drew.
I have about 80 unprocessed images & 3 rolls of film, it will keep me out of mischief for a while.
Off on my travels again – this time in search of the early Bronze Age site of Salut, some 20 kilometres south of Bahla & Jabrin fort.
A place I have known about for several years, but never visited until now; glad I left it so late because there has been extensive archaeological research carried out recently.
The site has been put forward for inclusion on the UNESCO world heritage list of sites with major historical interest.
It has had extensive human settlement in this area since at least the end of the fourth millennium BC to the present day. Observable by the large concentration of archaeological evidence that can still be seen. There are indications of very large settlements from the Bronze Age (c.3000-1300BC) and following Iron Age (c.1300-300 BC) probably through to the Middle Ages, with farming still carried on in 2015.