Ancient discovery in Kenya suggests early humans were inventors of stone tools

A significant discovery in northwest Kenya suggests that early humans were inventors long before previously believed. Archaeological findings at the site known as Namorotukunan indicate that primitive humans used stone tools continuously for 300,000 years, dating back 2.75 million years.

This challenges earlier notions that tool use among early humans was sporadic and quickly forgotten. According to Prof. David Braun from George Washington University, this evidence indicates a long continuity of behavior in tool use, suggesting that such skills were likely passed down through generations.

Researchers spent a decade at Namorotukunan uncovering over 1,300 stone tools, including sharp flakes, hammerstones, and cores, all made using Oldowan technology, the earliest widespread method of stone tool production. The tools were found in three distinct layers, with deeper layers representing older artifacts. Many stones were selected for their quality, indicating that the makers possessed significant skill and knowledge.

Dr. Dan Palcu Rolier, a senior geoscientist on the team, noted the sophistication of the toolmakers, describing them as "extremely astute geologists" who knew how to source the best materials. He emphasized that the sharpness of some tools was such that they could easily cut skin.

Geological evidence suggests that the early humans at Namorotukunan thrived despite significant climatic shifts—from lush wetlands to dry grasslands and semi-deserts. Instead of undergoing biological adaptations, these early inhabitants utilized technology to survive. Dr. Palcu Rolier stated, “Technology enabled these early inhabitants of East Turkana to survive in a rapidly changing landscape."

The tools allowed them to access various food sources, such as ripping open animal carcasses and digging for plants, which was crucial for sustenance. Evidence from the site shows that animal bones were broken and cut using these tools, indicating a consistent diet that included meat.

The findings also challenge the belief that continuous tool use emerged later, around 2.4 to 2.2 million years ago, alongside a significant increase in brain size. Prof. Braun pointed out that the tools at Namorotukunan were used before this brain size increase, implying that early humans possessed cognitive abilities that have been underestimated.

In summary, the evidence from Namorotukunan suggests that the roots of human adaptability through technology extend back to 2.75 million years ago, potentially much earlier than previously thought, reshaping our understanding of early human evolution and tool use.