A world beneath the water
The floodplain of the Yangtze River near Wuhu is an immense archaeological archive. Seasonal floods deposit layers of silt, creating a low-oxygen, waterlogged environment that slows decomposition to a crawl. Organic materials that would normally vanish in a few years can survive for millennia. This unique form of preservation shows the Neolithic period, specifically the Majiabang culture, which flourished in this region from approximately 5000 BCE to 3300 BCE.
The science of this preservation lies in the absence of oxygen. Microorganisms that cause decay need oxygen to function. In the dense, water-saturated mud of the floodplain, this important element is scarce. As a result, delicate materials like wood, seeds, and even rice paddies can be maintained for thousands of years. When excavated, wooden artifacts are often so well-preserved that they appear freshly carved. The primary chemical change in this waterlogged archaeological wood is the degradation of cellulose and hemicellulose, while the more durable lignin remains, leaving a fragile but intact wooden skeleton.
The first carpenters and farmers
Archaeological sites associated with the Majiabang culture reveal a society with sophisticated knowledge of both agriculture and construction. They were among the world's earliest cultivators of rice. At sites in the lower Yangtze region, excavators have uncovered the remains of ancient paddy fields, showing that rice farming was a central part of their economy. Analysis of microscopic silica particles from rice leaves, called phytoliths, allows researchers to distinguish domesticated rice from its wild ancestors.
Alongside farming, the Majiabang people were skilled woodworkers. Their settlements contained the remains of timber-frame buildings. These structures used advanced joinery, including mortise-and-tenon joints, a technique that shows a complex understanding of carpentry. This method of construction became a feature of traditional Chinese architecture for thousands of years. Excavated wooden tools include shovels, paddles, and building columns. Other unearthed items include stone adzes for working wood, pottery for cooking and storage, and tools made from animal bone and antlers. Faunal remains show they also hunted sika and roe deer and had domesticated pigs.