Stone tools through generations

New research shows 300,000 years of human technology, including the presence of toolmaking and butchering along an ancient river in the Turkana Basin

To the point

• Tech mastery over millennia: Early hominins engineered sharp-edged stone tools with extraordinary consistency, showing advanced skill and knowledge passed down across countless generations—a steady legacy.
• Thriving in the face of climate chaos: These toolmakers lived through radical environmental upheavals. Their adaptable technology helped unlock new diets, including meat and marrow, turning hardship into a survival advantage.
• Cutting-edge science with ancient rocks: Using volcanic ash dating, magnetic signals frozen in ancient sediments, and microscopic plant remains, researchers pieced together an epic climatic saga that provides context for this flourishing technology.

Imagine early humans meticulously crafting stone tools for nearly 300,000 years, all while contending with recurring wildfires, droughts, and dramatic environmental shifts. Now, a new study brings to light remarkable evidence of enduring technological tradition from Kenya’s Turkana Basin.

At an archaeological site called Namorotukunan, an international research team has uncovered one of the oldest and longest intervals of Oldowan stone tools yet discovered, dating from approximately 2.75 to 2.44 million years ago. These artifacts demonstrate that our ancestors not only survived but thrived throughout an environmentally volatile period in Earth’s history when Namorotukunan and the surrounding area transformed from a lush, fertile floodplain into a dry, arid environment.

A long-standing technological tradition

“This site reveals an extraordinary story of behavioral flexibility and cultural continuity,” said lead author David R. Braun, a professor of anthropology at the George Washington University who is also affiliated with the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany. “What we’re seeing isn’t a one-off innovation–it’s a long-standing technological tradition.”

The 2.75-million-year-old Namorotukunan site reveals the earliest known evidence of tool making, showing that early humans adapted their technology through dramatic environmental shifts. According to the researchers, this discovery opens the door to further research on the connection between climate change and human innovation.

"Namorotukunan offers a rare geological lens into a changing world long gone—where shifting rivers, wildfires, and aridification reshaped the landscape over and over," said Dan V. Palcu Rolier (GeoEcoMar, Utrecht University, University of São Paulo). "Yet despite these environmental challenges, early human ancestors were able to survive using their tool-making tradition, perhaps revealing the roots of one of humankind’s oldest habits: using technology to steady ourselves against change."