Sweet Track: Britain's Neolithic Timber Walkway of 3807 BC

The Sweet Track is a Neolithic timber walkway built across the wet reed swamps of the Somerset Levels in south-west England. Tree-ring dating shows that its oak planks came from trees felled in the winter of 3807/3806 BC, which makes it one of the oldest precisely dated structures in Europe. Preserved in waterlogged peat, it gives a rare and detailed glimpse of how some of Britain’s first farmers moved through, worked and used a wetland landscape.

Background: early farmers in a wetland

Farming reached Britain shortly after 4000 BC, bringing cereals, domestic cattle, sheep and pigs, pottery and new kinds of stone tools (see the arrival of farming in Neolithic Britain). The Somerset Levels were then a low basin of reed swamp, fen and open water, broken by islands and ridges of drier ground.

These wetlands were rich in fish, wildfowl, reeds and timber, but they were difficult to cross on foot. The people who built the Sweet Track lived on the drier land around the swamp and needed a dependable way across it. The track linked the Polden Hills ridge to the south with the island of Westhay to the north.

Discovery and excavation

The track was found in 1970 by Ray Sweet, a worker cutting peat for a commercial company, who noticed timbers in a drainage ditch and reported them. It was named after him. Peat extraction was destroying the archaeology of the Levels, so the find helped prompt the Somerset Levels Project, a long-running rescue programme led by the archaeologists John and Bryony Coles from 1973 into the late 1980s.

Excavations exposed several stretches of the track, which turned out to run for roughly 1.8 to 2 kilometres. Because the timber had lain in airless, waterlogged peat for nearly six thousand years, it survived in remarkable condition, along with tool marks, wood chips and objects dropped beside it.

How the walkway was built

The builders used a simple but effective design that suited soft, wet ground:

• long poles of alder, hazel and other wood were laid end to end along the surface of the peat as a base rail;
• pairs of pegs were driven diagonally into the peat on either side of the rail, crossing above it in an X shape;
• planks, mainly of split oak, were laid in the V formed by the crossed pegs, raising a narrow footway above the wet surface.

The planks had been split radially from large oak trunks with stone axes and wedges, while ash, lime, hazel and other species provided pegs and rails. The finished footpath was only wide enough for people to walk in single file.

Studies of the timber suggest that the materials were prepared in advance and assembled quickly, probably in a single building episode. Many of the smaller poles came from managed woodland, which hints that people were already coppicing trees, cutting them back so they would regrow straight stems.

Dating by tree rings

The Sweet Track is famous among archaeologists because of the precision of its date. In 1990 a team of dendrochronologists, including Jennifer Hillam and Mike Baillie, matched the ring patterns of the track’s oak planks to long reference chronologies from Ireland and Britain. They showed that the trees were felled in the winter of 3807/3806 BC.

Few prehistoric structures can be dated to a single year. The tree rings also show that some repairs were made over the following decade or so. After roughly ten to twelve years of use, rising water levels seem to have flooded the area, and the walkway was abandoned and covered by growing peat.

Excavations also revealed an older trackway, the Post Track, running along a similar line and partly beneath the Sweet Track. Its timbers were felled around 3838 BC, about three decades earlier. This means that the route itself was in use before the Sweet Track was built.

Finds beside the track

People walking along the track dropped, lost or deliberately placed objects in the swamp beside it. These finds include:

• leaf-shaped flint arrowheads;
• pottery bowls, including one containing hazelnuts;
• flint flakes and tools, and a variety of small wooden objects;
• an axe head of jadeitite, a hard green stone that came from the western Alps in northern Italy, about 1,000 kilometres away.

The jadeitite axe appears never to have been used for work. Many archaeologists interpret such objects as prestige items or offerings, and its presence shows that Neolithic Britain was linked to long-distance exchange networks reaching across Europe.

Preservation and display

Most of the Sweet Track remains buried in the peat. A stretch lies within Shapwick Heath National Nature Reserve, where a pumped water supply keeps the ground wet so that the wood does not dry out and rot. The track is a scheduled monument, protected by law.

Lifted sections and many of the finds are kept by the British Museum and by museums in Somerset. A modern reconstruction of the walkway stands at Shapwick Heath so that visitors can see how it worked. Comparable waterlogged timbers survive at the prehistoric pile dwellings around the Alps, while Stonehenge, begun some eight centuries later, shows how ambitious Neolithic building in Britain would become.

Timeline

• c. 3838 BC: Timbers of the earlier Post Track are felled along a similar route.
• 3807/3806 BC, winter: Oak trees are felled for the Sweet Track, which is built soon afterwards.
• c. 3800–3795 BC: Repairs are made to the walkway over about a decade.
• c. 3795 BC: Rising water levels lead to the track being abandoned and buried in peat.
• 1970: Peat cutter Ray Sweet discovers the timbers.
• 1973: The Somerset Levels Project begins systematic excavation and survey.
• 1990: Tree-ring analysis fixes the felling date to the winter of 3807/3806 BC.

Why it matters

The Sweet Track shows that early Neolithic communities in Britain could plan and build substantial structures within a few years of farming’s arrival. Its exact tree-ring date anchors the chronology of the British Neolithic, and its finds connect a Somerset swamp with the Alps. It is also a reminder of how much of the past survives only in wetlands, which modern drainage and peat cutting continue to threaten.