The oldest known evidence of humans deliberately using fire has been found not on an open plain but deep inside a cave in South Africa, where natural flames could never reach. Researchers discovered burned bones buried far from the cave entrance, suggesting that early human ancestors carried fire into the darkness and kept it alive. The find pushes back the timeline for controlled fire use by hundreds of thousands of years.
Burned Bones Deep Inside Wonderwerk Cave
Wonderwerk Cave sits in South Africa’s Kalahari Desert. For years, archaeologists have dug through its layered sediments, searching for signs of ancient life. In 2012, the same team found evidence of fire dating to about one million years ago, which was then considered the oldest known intentional fire use anywhere. But continued excavation has now pushed that date back dramatically.
Using a new technique that detects microscopic signs of burning in fossilized bone, scientists identified fire traces in deposits dating between 1.07 and 1.79 million years ago. The burned bones were found far inside the cave, beyond the reach of any natural wildfire. That means the fire was not accidental. It was brought in and tended by hominins.
A Collaboration Across Continents
The research was led by Dr. Liora Kolska Horwitz of the Hebrew University of Jerusalem, who co-directs the Wonderwerk Cave project with Prof. Michael Chazan of the University of Toronto. An international team of scientists from Spain, Argentina, Canada, the United States, South Africa, Portugal, and Israel contributed to the study, which combined archaeology, paleontology, and geology.
The findings were published in PLOS One. They offer a new window into how early humans interacted with fire long before they could create it on demand. Fire provided warmth, light after dark, protection from predators, and eventually the ability to cook food. But pinpointing when humans first began using fire has been one of archaeology’s hardest questions.
Why Local Researchers Care
For South African scientists and the broader archaeological community, Wonderwerk Cave is a rare site. Its deep sediment layers preserve a long record of early human activity in a region already famous for ancient hominin fossils. The new evidence shows that early humans were not just scavenging or hunting. They were managing a complex resource inside a cave, a behavior that required planning and coordination.
The study also introduces a new tool for detecting ancient burning, which could help identify fire use at other sites where evidence has been too subtle to see. That technique may reshape what we know about when and where early humans first harnessed fire.
A Timeline Pushed Back
The discovery does not prove that these early humans could start a fire from scratch. They likely collected fire from natural sources like lightning strikes and carried it into the cave, keeping it burning. But even that required sophisticated behavior. It suggests a level of social organization and environmental understanding that predates previous estimates by a wide margin.
Wonderwerk Cave now stands as one of the oldest known sites associated with hominin fire use anywhere in the world. The burned bones, lying deep in the dark, are quiet evidence of a skill that would eventually change everything.
