Archaeological excavations on the Indonesian island of Sulawesi have uncovered seven stone tools dating back at least 1.04 million years, potentially extending to 1.48 million years ago. This groundbreaking discovery, published in the journal Nature, represents the oldest evidence of hominin occupation in the Wallacean archipelago and suggests that unknown human relatives were capable of oceanic crossings far earlier than previously imagined. The identity of these ancient toolmakers remains one of archaeology’s most tantalizing mysteries.
The Calio Site Discovery
The seven chert stone artifacts were excavated between 2019 and 2022 at Calio, located in a modern corn field in southern Sulawesi. These simple yet sophisticated tools were manufactured using hard-hammer percussion techniques, where ancient toolmakers struck larger pebbles from nearby riverbeds to create sharp-edged flakes suitable for cutting and scraping tasks. Professor Adam Brumm from Griffith University’s Australian Research Centre for Human Evolution, who co-led the international research team, described the artifacts as “simple, sharp-edged flakes of stone that would have been useful as general-purpose cutting and scraping implements.”
The tools demonstrate remarkable technical knowledge despite their straightforward appearance. Evidence suggests a two-step reduction process was sometimes employed, where large flakes were further reduced into smaller, more manageable tools. Some artifacts even showed retouching – deliberate trimming of edges to enhance sharpness. This level of sophistication indicates that the toolmakers possessed expert understanding of fracture mechanics within a pragmatic, “least effort” approach to tool manufacturing.
Hellbound and Down 