East Asian Stone Tool Discoveries Rewrite Prehistoric Timelines
Two recent studies, published in the Journal of Human Evolution, provide revised dates and new archaeological evidence regarding stone tool technologies in central China. The research indicates that hominins in East Asia produced sophisticated stone tools during the late Middle and early Late Pleistocene, challenging prior assumptions about technological development in the region.
Lingjing Site: Revised Dating and Technological Analysis
A study led by researchers from the University of Bordeaux revised the age of stone tools previously excavated at the Lingjing archaeological site in Henan province. Using uranium-thorium dating on a deer-like animal rib containing calcite, the team determined the tools are approximately 146,000 years old. This date places their creation during a glacial period, revising an earlier estimate of 126,000 years, which was associated with a warmer interglacial period.
The stone tools found at Lingjing are primarily made of quartz. They exhibit knapping techniques that involve deliberate preservation of angles on the stone to produce flakes. The researchers described the level of planning and precision required for this method as sophisticated. The underlying technology shows similarities to Middle Paleolithic technologies found in Europe and Africa.
"The planning and precision required for this method are highly sophisticated."
The study’s authors suggested the tools may have been produced by Homo juluensis, a proposed archaic human species with a large brain that is estimated to have lived in eastern Asia from approximately 300,000 to 100,000 years ago. A comparative analysis of 100 Paleolithic sites in China indicated that this type of toolmaking became a widespread adaptation to shifting environments during this period.
Xigou Site: Evidence of Composite Tool Technology
Separately, archaeologists unearthed over 2,600 stone tools at the Xigou site, also in Henan province. The excavation, conducted between 2019 and 2021, yielded artifacts dating from approximately 160,000 to 72,000 years ago.
A significant portion of these tools were identified as “hafted,” meaning they were originally attached to a handle or shaft made of wood or other organic materials. This is the earliest known evidence of composite tools in Eastern Asia. Microscopic analysis of the tools indicates they were primarily used to process plant materials, such as wood or reeds. The manufacturing process required multiple intermediate steps, indicating planning and foresight.
"This is the earliest known evidence of composite tools in Eastern Asia."
The research team noted that the Xigou finds dispute the longstanding concept of the “Movius Line,” a hypothesis from the 1940s that proposed a geographical divide between advanced Acheulean tool cultures in Africa and Western Eurasia and more conservative tool cultures in East Asia.
Unanswered Questions and Context
The specific hominin species responsible for the Xigou tools remains unclear. The study noted that several species, including Denisovans, Homo longi, Homo juluensis, and Homo sapiens, could have inhabited the region during that timeframe.
The newly dated Lingjing tools and the Xigou assemblage, taken together, suggest that advanced tool production strategies appeared in East Asia earlier than previously understood by some archaeological models. According to the reports, the inhabitants of the region during this period were hunter-gatherers, though limited evidence of mammal bones at Xigou makes detailed lifestyle deductions difficult. The findings indicate that hominins in the region displayed a high degree of behavioral flexibility and successful adaptation to local climate and resources.