A team of archaeologists from Chicago’s Field Museum has uncovered thousands of stone tools in coastal caves near South Africa’s southern tip. Some of the tools date back as far as 24,000 years. The discovery, detailed in a recent Journal of Paleolithic Archaeology study, reveals advanced blade-making techniques developed during the Last Glacial Maximum. These findings offer new insights into how Ice Age humans connected, adapted, and exchanged knowledge over long distances.
The excavation was led by Dr. Sara Watson, a postdoctoral researcher at the museum’s Negaunee Integrative Research Center. It focused on caves near what would have been an inland plains region 20,000 years ago. At that time, lower sea levels had pushed the coastline miles beyond its current boundary. The area, rich with antelope and other megafauna, gave hunter-gatherers a strategic place to live and hunt.
The tools, crafted between 24,000 and 12,000 years ago, include small, razor-sharp bladelets and stone cores—the parent rocks from which blades were systematically chipped. By analyzing minuscule striations and reduction patterns on these artifacts, the team reconstructed the meticulous methods used to produce them. Notably, the cores exhibited a distinctive reduction strategy known as “Robberg” technology, named after the region’s caves, where tiny bladelets were precision-struck in sequences to maximize efficiency.
“The core is the storyteller,” Watson explained. “It reveals the intentionality behind each strike—a shared ‘recipe’ repeated across sites.” Strikingly, this method mirrors techniques identified in sites hundreds of miles away in modern-day Namibia and Lesotho. “The repetition of these patterns isn’t accidental. It signals a transmission of knowledge, likely through direct interaction between groups,” Watson added.
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