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The Thornborough Henges is an unusual ancient monument complex that includes the three aligned henges that give the site its name. The complex is located near the village of Thornborough, close to the town of Masham in North Yorkshire, England. The complex includes many large ancient structures including a cursus, henges, burial grounds and settlements. They are thought to have been part of a Neolithic and Bronze Age 'ritual landscape' comparable with Salisbury Plain and date from between 3500 and 2500 BC. This monument complex has been called 'The Stonehenge of the North' and has been described by English Heritage as the most important ancient site between Stonehenge and the Orkney Islands.
The cursus is the oldest and largest ancient monument at Thornborough. It is almost a mile in extent and runs from Thornborough Village, under the (later) central henge and terminates close to the River Ure in a broadly east/west alignment.
Cursuses are perhaps the most enigmatic of ancient monuments. They typically comprise two parallel ditches, the larger of which can be a mile or more in extent, cut to create a "cigar shaped" enclosure. Typically, burial mounds and mortuary enclosures are found alongside cursus monuments indicating that they probably had a ceremonial function.
The three henges are almost identical in size and composition, each having a diameter of approximately 240 metres and two large entrances situated directly opposite each other. The henges are located around 550 m apart on an approximate northwest-southeast alignment, although there is a curious 'dogleg' in the layout. Altogether, the monument extends for more than a mile.
Archaeological excavation of the central henge has taken place. It has been suggested that its banks were covered with locally mined gypsum. The resulting white sheen would have been striking and visible for miles around. A double alignment of pits, possibly evidence of a timber processional avenue, extends from the southern henge.
The 'dogleg' in the layout appears to cause the layout of the henges to mirror the three stars of Orion's Belt. The exact purpose of the henges is unclear though archaeological finds suggest that they served economic and social purposes as well as astronomical ones.
The Northern henge is currently overgrown with trees but is one of the best preserved henges in Britain. The Central and Southern henges are in poorer condition although the banks of the henges are still quite prominent, especially in the case of the Central henge. To gain a full appreciation of the scale of the monument it is best viewed from the air.
All three of the Thornborough henges and the narrow strip of land connecting them are Scheduled Ancient Monuments. However, the land is privately owned and there is no official public access. Despite this, the site does have a steady stream of visitors throughout the year. Since 2004 there has been an opportunity for public access to the central henge, which is owned by Tarmac Northern Ltd. to attend the celebration of the ancient Gaelic festival of Bealtaine. On 1 May 2005 this event was attended by around 150 people from across the north of England.
Extensive quarrying has destroyed much of the monument's setting to the north and west of the henges. The site lies within the wider Nosterfield quarry area being exploited for gravel by Tarmac Northern Ltd. Although the henges themselves are not threatened, Tarmac now wishes to extend its quarrying operations to a 45 hectare site less than a mile east of the henges known as 'Ladybridge Farm'. Preliminary investigations of this area of land to discern its archaeological significance have suggested that it may have been a location of ritual Neolithic encampments, possibly used by those people who built or visited the henges. Opponents of the plan claim that if permission was granted for this area to be quarried, much of the remaining contextual information about the henges would be lost. A campaign led by local people and concerned archaeologists is attempting to persuade Tarmac and North Yorkshire County Council to guarantee the protection of the area. British planning and archaeology guidelines prefer preservation in situ of archaeological remains. In cases where this is not possible, such as quarrying, preservation by record is an option, involving archaeological excavation. Campaigners argue that further excavation and subsequent quarrying will destroy the ritual landscape completely.
In 2002 Tarmac Northern Ltd. expressed an intention to apply for planning permission to quarry Thornborough Moor, thus intending to quarry right up to the edge of the designated scheduled monument area. In March 2005, Tarmac stated it would not seek to apply for planning permission to quarry this site for at least ten years, the period covered by North Yorkshire County Council's Minerals Plan.
In February 2006 North Yorkshire County Council turned down Tarmac's application to expand quarrying to the Ladybridge Farm site.
Later in 2006 Tarmac submitted a revised planning application to North Yorkshire County Council.
The revised application for Ladybridge, which is adjacent to the current Nosterfield Quarry, reduces the proposed area for sand and gravel extraction from 45 hectares to 31 hectares and avoids the south west section of the site to address concerns raised about archaeology. The application was approved in February 2007.
Late in 2007 campaign group Friends of Thornborough requested a judicial review of the planning permission due to a number of procedural irregularities. In response, North Yorkshire County Council ruled the permission to be "fatally flawed and withdrew the permission previously granted. It is now planned that the planning application will be re-determined by North Yorkshire County Council planning committee on 22 April 2008. Planners have indicated that granting of permission is likely. However, campaign group TimeWatch have raised the issue of new Neolithic archaeology found within the new quarry area since the last planning meeting.
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