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World's Oldest Multi-Component Arrow Poison Discovered in 7,000-Year-Old Antelope Bone

January 25, 2025

In 1983, archaeologists excavating Kruger Cave in South Africa uncovered an intriguing discovery—a 7,000-year-old antelope femur containing three bone arrowheads. Initially, the significance of the find lay dormant as the bone was stored in the University of the Witwatersrand's Archaeology Department. However, renewed interest in 2022 sparked fresh research, leading to groundbreaking insights.

Unveiling Ancient Hunting Practices

A team from the University of Johannesburg, including archaeologist Justin Bradfield, revisited the femur. Utilizing modern micro-CT imaging, they revealed the marrow cavity was filled with a unique substance—far from ordinary sediment. Chemical analysis identified a complex mixture of toxic compounds: digitoxin and strophanthidin, known cardiac glycosides, alongside ricinoleic acid, a by-product of the toxin ricin. These findings confirmed the femur contained the world's oldest verified multi-component arrow poison.

Evidence of Advanced Cognitive and Pharmacological Knowledge

The discovery highlights ancient humans' sophisticated understanding of their environment. The ability to combine multiple plant-derived toxins demonstrates advanced cognitive skills and traditional pharmacological expertise. Interestingly, the plants contributing to these toxins were not native to the Kruger Cave area, implying long-distance trade or travel to acquire these resources.

A Broader Context of Poison Usage

While poison application in hunting dates back 60,000–70,000 years, this is the earliest confirmed instance of combining multiple toxic ingredients. Earlier evidence includes traces of ricinoleic acid on a 24,000-year-old wooden spatula found at Border Cave and potential poison residues on 13,000-year-old bone arrowheads in Zanzibar, though these cases lacked chemical confirmation.

Implications for Archaeological Research

This discovery underscores the power of archaeobotany and organic chemistry in unraveling ancient human behaviors. It also sheds light on early trade networks and the deep roots of traditional knowledge systems. Long before the use of currency, humans were likely exchanging valuable resources like medicinal or toxic plants.

The Evolution of Hunting Technology

The use of poison on hunting weapons marks a significant leap in technological innovation. Southern African hunters have historically used diverse plants and animals to create potent arrow poisons, often through complex recipes. The femur’s contents further illustrate the enduring ingenuity of early humans in adapting their tools for survival.

A Legacy Preserved

This ancient femur, with its remarkably well-preserved contents, offers a unique glimpse into the lives of our ancestors. It not only speaks to their ingenuity but also opens new pathways for understanding early human innovation, trade, and ecological knowledge. This find reaffirms the importance of preserving archaeological sites for future generations to explore humanity’s fascinating past.

Source: https://www.sciencealert.com/worlds-oldest...
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