Evidence Shows Humans Inhabited African Rainforests 150,000 Years Ago
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New research has uncovered evidence that human ancestors lived in dense West African rainforests approximately 150,000 years ago. This discovery, based on stone tools and environmental analysis from a site in Côte d'Ivoire, pushes back the timeline for human adaptation to such environments by over 130,000 years. The findings challenge long-held assumptions that early humans primarily inhabited open grasslands and coastal areas.
Facts First
- Stone tools found in Côte d'Ivoire date human rainforest habitation to 150,000 years ago
- Environmental analysis shows the site was a dense, humid forest with low grass pollen
- The discovery rewrites the timeline, as the previous oldest secure evidence in Africa was from 18,000 years ago
- The global record for rainforest habitation is also surpassed, previously held by a 70,000-year-old site in Southeast Asia
- The research was conducted by an international team and published in the journal Nature
What Happened
Researchers investigating an archaeological site in present-day Côte d'Ivoire found evidence of human habitation in wet tropical forests approximately 150,000 years ago. The findings were published in the journal Nature. In the 1980s, Professor Yodé Guédé of l'Université Félix Houphouët-Boigny investigated a site known as Bété I during a joint Ivorian-Soviet research mission. Excavations at Bété I uncovered layers of stone tools buried underground in what is currently rainforest territory. An international team returned to the Bété I site using modern technology to re-investigate the original trench relocated with the help of Professor Guédé, though mining activity has since destroyed the site.
Scientists used Optically Stimulated Luminescence and Electron-Spin Resonance dating techniques to determine the site's age, which indicated human occupation occurred around 150,000 years ago. Analysis of pollen, phytoliths (tiny silica structures left behind by plants), and chemical traces in sediments showed the area was heavily forested during human occupation. Samples contained pollen and plant waxes associated with humid West African rainforests and showed very low levels of grass pollen, indicating dense woodland.
Why this Matters to You
This discovery fundamentally reshapes our understanding of human adaptability and history by suggesting our ancestors were capable of thriving in challenging, dense forests much earlier than previously thought. This may lead to a broader search for evidence of early human life in other overlooked environments, potentially uncovering new chapters of our shared past. For anyone interested in human origins, it provides a more complex and resilient picture of how our species spread and survived.
What's Next
The research team, led by senior author Professor Eleanor Scerri, has established a new benchmark. Other researchers are likely to re-examine archaeological sites in similar forested regions with these new dating and environmental techniques. Future discoveries may continue to push back the timeline and reveal more about the specific survival strategies early humans developed for life in dense rainforests.