A 4,000-year-old wooden trackway that forms the centrepiece of a Neolithic henge has been unearthed by archaeologists.

Ancient springs that surrounded the circular monument, which dates from 2,300BC, have led to the excellent preservation of organic material like bone and wood.

That includes the skull of a 6,300-year-old species of wild cattle, known as aurochs, as well as wooden posts.

Experts have described the site, near Woodbridge, Suffolk, as having 'international significance'.

A 4,000-year-old wooden trackway that forms the centrepiece of a Neolithic henge (pictured) has been unearthed by archaeologists at a site, near Woodbridge, Suffolk, described by experts as having 'international significance'

The finds were made as part of excavation work for a cable being laid for a £2.5bn ($3.3bn) offshore wind farm in the area.

Energy company ScottishPower Renewables was digging a 23 mile (40km) trench to connect new turbines to the national grid.

Around 70 archaeologists have been working near Woodbridge since February, carefully unearthing the 100 foot (30-metre) long wooden track, which forms the centrepiece of the prehistoric monument.

Initial theories suggest that the area's natural springs, which can still be seen today, may have been part of the reason that the area had special significance to the area's stone age inhabitants.

Around 70 archaeologists have been working near Woodbridge since February, carefully unearthing the 100 foot (30-metre) long wooden track, which forms the centrepiece of the prehistoric monument

Ancient springs that surrounded the circular monument, which dates from 2,300BC, have led to the excellent preservation of organic material like bone and wood. This image shows a wooden post

The finds were made as part of excavation work for a cable being laid for a £2.5bn ($3.3bn) offshore wind farm in the area. This image shows another wooden post discovered at the site

WHAT ARCHAEOLOGICAL ITEMS WERE FOUND NEAR WOODBRIDGE IN SUFFOLK? Experts have described the site of an archaeological dig, near Woodbridge, Suffolk, as having 'international significance'. Among the discoveries unearthed so far have been: A 4,000-year-old wooden trackway that forms the centrepiece of a Neolithic henge

Wooden posts so well preserved that experts can see markings made by an apprentice, before a more experienced tradesman completed the job

The skull of an extinct species of large wild cattle, known as aurochs, which has been carbon dated to around 4,300 BC

A variety of artefacts from the Bronze Age, Iron Age, Roman and Medieval periods, including a tanged arrowhead Advertisement

Richard Newman, associate director at Wardell Armstrong who worked on the dig, said: 'Undoubtedly this is a site of international archaeological significance.

'It is exceptionally rare to find preserved organic materials from the Neolithic period, and we will learn a great deal from this discovery.

'Some of the wood is so well preserved we can clearly see markings made by an apprentice, before a more experienced tradesman has taken over to complete the job.

'Initially some of the wooden posts looked like they were maybe one hundred years old, and it is incredible to think that they are over 4,000 years old.'

Energy company ScottishPower Renewables were digging a 23 mile (40km) trench to connect new turbines to the national grid. This image shows a selection of wooden posts unearthed

Initial theories suggest that the area's natural springs, which can still be seen today, may have been part of the reason that the area had special significance to the area's stone age inhabitants. This image shows a selection of wooden posts found during the dig

Richard Newman, associate director at Wardell Armstrong who worked on the dig, said: 'Undoubtedly this is a site of international archaeological significance.' This image hows a tanged arrow head found at the site

Diggers also found the skull of an auroch, an extinct species of large wild cattle, which has been carbon dated to around 4,300 BC.

The skull has been cut in a way that suggests it had potentially been fixed to a pole as a totem or used as some form of headdress.

At the time the trackway was built, the skull was already 2,000 years old, suggesting it was a significant item.

Substantial numbers of white pebbles, not common in the area, were also found beside the track.

The positions in which the stones were found suggests they were deliberately deposited in a way that had significance to the people at the time.

The finds were made in Woodbridge as part of excavation work for a cable being built by East Anglia One for a wind farm

Diggers also found the skull of an auroch (pictured), an extinct species of large wild cattle, which has been carbon dated to around 4,300 BC

The skull (pictured) has been cut in a way that suggests it had potentially been fixed to a pole as a totem or used as some form of headdress

At the time the trackway was built, the skull (pictured) was already 2,000 years old, suggesting it was a significant item.

Because organic finds of this age are so rare and vulnerable when exposed, they needed to be kept wet during excavation.

The features containing the organic material were flooded every night and the archaeologists continually sprayed the wood to keep the trackway preserved as they worked.

The wood and other artefacts have now been sent for further analysis, and some of the leading experts on the Neolithic period have already visited to help build up a full picture of activities on the site.

Up to 400 archaeologists have been involved over the last two years, with up to 250 people on site at any given time.

Charlie Jordan, East Anglia One project director for ScottishPower Renewables, said: 'In the last two years our project has been responsible for uncovering artefacts from the Bronze Age, Iron Age, Roman and Medieval periods, but is seems that the best has been saved to last.'

Started earlier this year, the 102-turbine East Anglia ONE project aims to provide enough energy to power the equivalent of almost 600,000 homes, which is the majority of households in Suffolk and Norfolk.

The project should be fully operational by 2020.

Because organic finds of this age are so rare and vulnerable when exposed, they needed to be kept wet during excavation. The features containing organic material, like this skull, were flooded every night

This painting is thought to depict an aurochs, a cattle/aurochs cross, or simply an aurochs like cattle breed. It is a copy of an original which probably dates from the 16th century