Two skulls from Yunxian, China, previously thought to be Denisovan ancestors, have been re-dated to 1.77 million years old, making them the oldest known Homo erectus fossils in eastern Asia. A recent study measured isotope ratios in quartz grains from the sediment layer containing the skulls, revealing they are 130,000 years younger than previously believed.

This revised date dramatically changes our understanding of early human migration. The skulls suggest Homo erectus spread across Asia much faster than anthropologists had realized, living in Georgia and central China simultaneously. Previously, the next-oldest Homo erectus fossils outside Africa were 1.63-million-year-old specimens from Gongwangling, China, suggesting a leisurely 140,000-year spread eastward.

The new dating also debunks claims that the Yunxian skulls were early Denisovans or Homo longi. At 1.77 million years old, they predate the Denisovan lineage, which DNA evidence places after 700,000 years ago. This finding challenges recent arguments about human family tree relationships and suggests our understanding of early hominin dispersal across Asia needs significant revision.