Burnt Bones Hint Humans Used Fire 1.8 Million Years Ago
Charred bones deep inside Wonderwerk Cave, dated up to 1.79 million years old, point to fire carried in and maintained by early humans, likely Homo erectus.
Deep inside a South African cave, charred bones may push the story of humanity’s oldest campfires back by nearly a million years. Researchers report evidence that early humans were using fire at Wonderwerk Cave as far back as 1.8 million years ago, far earlier than the textbooks have it.
In a study published this month in the journal PLoS ONE, a team examined animal bones from cave layers dated between 1.07 and 1.79 million years old and found, using a new technique that detects the chemical traces of burning, signs that the bones had been heated by fire, again and again, in a spot deep enough inside the cave that a natural wildfire could not have reached it.
That depth is the crux of the argument. Lightning-sparked grass fires can leave burn marks near a cave mouth, but not in its dark interior. Repeated burning far inside, the researchers argue, points to fire that was carried in and kept going, most likely by Homo erectus, the long-limbed human ancestor that ranged across Africa and beyond at the time. The new method, which reads heat damage in the structure of the bone itself, is what let them make the call where older techniques could not.
The claim comes with the usual cautions of deep-time science. The dating spans a wide window, the bones cannot say whether the hominins sparked the fire themselves or merely tended flames they found, and “using” fire is not the same as “controlling” it, a distinction archaeologists guard carefully. What the evidence supports is narrower and still striking: that something was deliberately keeping fire alive, deep in a cave, almost two million years ago.
If it holds up, the finding nudges one of the defining moments of human evolution earlier than expected. Fire is what let our ancestors cook, stay warm, fend off predators and gather after dark, the habit that may have reshaped the very body and brain that distinguish us. Wonderwerk’s burnt bones suggest that turn began deeper in the past than anyone had been able to prove.
