It’s hard not to feel slightly superior when you belong to the only human species on the planet. Behind us there is a long track of extinct relatives that did not make it to our days. The Neanderthals in Europe went extinct some 40,000 years ago, just as we got there – leading us to believe we forced them out by being so much more advanced.
But science often teaches us to be humble. We have discovered 47 human teeth in China that are between 80,000 and 120,000 years old, suggesting it took early humans at least twice as long to enter Europe than they did to expand throughout Asia. The result, published in the journal Nature, challenges our current understanding of how humans evolved and spread – especially how we ended up replacing the Neanderthals.
Researchers believe that our species evolved in East Africa around 190,000 to 160,000 years ago. After this, human fossils from the archaeological sites of Es Skhül and Jabel Qafzen, in Israel, suggest they spread there between 80,000 and 120,000 years ago. However, these samples preserve some archaic features that place them “on verge of modernity” but not fully modern yet. They have therefore been thought of as the result of a failed dispersal out of Africa that barely managed to reach beyond the borders of the African continent. So that means that modern humans were at the gates of Europe, but it took them another 50,000 years to be able to enter the land of the Neanderthal.
Genetic studies have indicated that the earliest successful “out of Africa” migration was around 60,000 years ago. But the newly discovered teeth, first found by a team of researchers at the Institute of Vertebrate Paleontology and Paleoanthropology of Beijingin the Fuyan (Daoxian) cave in southern China, are truly modern. The team dated the sample to be more than 80,000 years old, indicating that our species was present in Asia considerably earlier than had previously been suspected. In fact, it implied that anatomically fully modern humans lived in Asia 30,000 to 70,000 years earlier than in Europe and the eastern Mediterranean.
When we first arrived in China we did not have any doubt about the teeth belonging to our own species, Homo sapiens. After a few weeks studying and comparing the teeth with our colleagues in Beijing we took a plane to cross the more than 2,000km distance between Beijing and the Daoxian County, followed by a long trip by car full of excitement and expectations. Was it really possible to find such a modern member of our own species so far in the east?
When we reached the small village of Daoxian and visited the cave we were speechless. The rock and sediment layers in the cave were simple and easy to understand. There were four clear horizontal layers that were easily tracked across the more than 300 square meters of excavation.
The teeth were found in a layer that was sealed by a continuous calcite floor, like an enormous gravestone that would have made it impossible for any soil or more recent fossils to accumulate below. There was a small stalagmite, an upward-growing pillar of mineral deposits from water dripping in, on top of this flowstone that experts from China and US have dated to be around 80,000 years old. As the stalagmite was formed after the calcite floor sealed the layer with the fossils, everything below had to be older than that.