Are these two teeth the oldest evidence of human ancestors in China?

Nature · Published 3 October 2026 Swipe more like this →

In short: Discovered in 1965, the Yuanmou Man remains are a puzzle of ancient evolution. While some researchers place these fossilized incisors at 1.7 million years old, others argue for a much younger date. This debate highlights the difficulty of tracking the earliest human expansions across the vast landscapes of prehistoric Asia.

The Yuanmou Man, classified as Homo erectus yuanmouensis, is known from two upper first incisors and a partial tibia found in the Yuanmou Basin of Yunnan Province, China. The teeth were unearthed in 1965 by geologist Qian Fang, while the tibial shaft was discovered nearby in 1984. These remains provide a rare glimpse into early hominin life in East Asia, suggesting a presence in the region that may date back to 1.7 million years ago.

Dating these fossils has proven exceptionally difficult due to the faulted nature of the Yuanmou Formation, which prevents reliable biostratigraphy. Over decades, researchers have employed various methods, including palaeomagnetism and protein ratio analysis, yielding wildly inconsistent results ranging from 1.7 million years to as recent as 0.5 million years ago. While 1.7 million years is a widely cited figure, the scientific community remains divided, with some studies suggesting the younger dates may stem from insufficient sample sizes.

The physical characteristics of the remains offer further complexity. The teeth exhibit a mix of archaic traits, such as a ridge running down the lingual side, which resembles early African Homo habilis and Homo ergaster more than the later, well-known Peking Man. Similarly, the tibia is gracile and flattened, showing anatomical similarities to H. habilis. These findings have led some experts to propose that Homo erectus did not arrive in East Asia in a single wave, but rather through multiple, distinct dispersal events.

Beyond the fossils, the site has yielded 16 stone tools, including scrapers and choppers, which mirror the simple Oldowan technology found in Africa. While early reports once suggested these humans used fire, modern consensus attributes charred remains at the site to natural wildfires. Today, the Yuanmou Man stands as a critical, if contested, piece of the puzzle regarding when and how early humans first settled the diverse environments of the Chinese plateau.

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