Ancient Skulls Rewrite Human History: Not Denisovan!

Recent discoveries are shaking up our understanding of human evolution. Two skulls unearthed in Yunxian, northern China, aren’t ancestors of the mysterious Denisovans as previously suggested. Instead, groundbreaking research reveals they represent the oldest known Homo erectus fossils in eastern Asia, pushing back the timeline of this pivotal hominin’s spread across the continent. This re-evaluation isn't just a minor correction; it fundamentally alters our perception of early human migration and the origins of various hominin lineages.

A New Date for Ancient Remains

A recent study, published in Science Advances, has meticulously re-dated the Yunxian skulls to approximately 1.77 million years old. This astonishing age makes them the most ancient hominin remains discovered to date in East Asia. The implications are significant: Homo erectus, a crucial ancestor to modern humans, Neanderthals, and Denisovans, must have dispersed across Asia far earlier and more rapidly than previously believed. Furthermore, this new dating sheds light on the identity of the toolmakers at even older archaeological sites in China, prompting a re-examination of existing evidence.

Yunxian: A Key Archaeological Site

Yunxian, situated on the banks of central China’s Han River, has long been recognized as an important – and sometimes debated – archaeological location. The site has yielded not only three nearly complete hominin skulls (with two now formally described) but also hundreds of stone tools and fossilized animal bones. Paleoanthropologist Hua Tu of Shantou University and his team employed a sophisticated dating technique, measuring the ratio of aluminum-26 and beryllium-10 isotopes in quartz grains from the sediment layer containing the skulls. The results definitively place the Homo erectus remains at 1.77 million years old – a mere 130,000 years after the species first emerged in Africa.

(Interestingly, the Han River has been consistently depositing layers of silt and gravel on the same terraces for over 2 million years, a remarkable geological phenomenon.)

Homo erectus: A Faster Expansion Than Thought

The revised dating strongly suggests that Homo erectus spread across Asia with remarkable speed. Currently, the oldest hominin bones outside Africa are the five skulls (along with numerous other skeletal remains) discovered at Dmanisi Cave in Georgia. These Dmanisi fossils range in age from 1.85 million to 1.77 million years old and are also attributed to Homo erectus (though some debate exists, as we’ll explore later).

Prior to this re-evaluation, the oldest Homo erectus fossils outside Africa were found at Gongwangling, another Chinese site located a short distance north of Yunxian, dating back 1.63 million years. This led to the assumption that Homo erectus took a leisurely 140,000 years to migrate eastward into Asia. However, the new evidence indicates that hominins were present in both Georgia and central China around the same time, implying a much faster dispersal, an earlier start, or a combination of both.

Debunking the Homo longi Connection

This new timeline effectively dismantles a previous hypothesis suggesting the Yunxian skulls were closely related to the Denisovans, specifically a lineage known as Homo longi. A September 2025 study proposed a digital reconstruction of one of the Yunxian skulls, comparing it to a 146,000-year-old skull from Harbin, China, recently identified through DNA analysis as a Denisovan (Homo longi).

The authors of that study argued that the Yunxian skulls represented an early form of Homo longi, diverging from our own lineage shortly after the Denisovan branch. This interpretation, based on the original paleomagnetic dates, proposed a hominin family tree where humans and Denisovans were more closely related to each other than to Neanderthals, with the branching event occurring much earlier than genetic evidence suggests.

However, numerous issues plagued those arguments. As University of Wisconsin paleoanthropologist John Hawks, who was not involved in the new study, stated in an email to GearTech, “1.77 million years is simply too old to establish a credible link to the Denisovan group, which DNA evidence indicates originated after approximately 700,000 years ago.”

Implications for Even Older Sites

The true significance of the 1.77 million-year-old Yunxian skulls lies in their ability to provide a crucial reference point for understanding even older archaeological sites in China. These sites contain evidence of stone tools that may predate the arrival of Homo erectus, raising the possibility that another hominin species reached East Asia even earlier.

Out of Africa: The Prequel

Homo erectus first appeared in the fossil record around 1.9 million years ago in Africa, sometimes referred to as Homo ergaster (a distinction that continues to fuel debate among paleoanthropologists). Within a few hundred thousand years, Homo erectus had spread across vast distances: from South Africa northward to the Levant, from Dmanisi Cave in Georgia eastward to the Indonesian islands.

Traditionally, Homo erectus is considered the first of our hominin ancestors to venture beyond Africa, following routes that our own species would later traverse 1.5 million years later. Crucially, many paleoanthropologists believe they were the first hominin capable of adapting to a wide range of diverse environments and overcoming the associated challenges.

Were They the First?

However, we may need to acknowledge the contributions of earlier members of our genus, such as Homo habilis. Stone tools discovered at two Chinese sites appear to be older than the earliest known Homo erectus remains. At Shangchen, located on the southern edge of China’s Loess Plateau, archaeologists unearthed stone tools from a 2.1-million-year-old sediment layer. Even older tools, dating back 2.43 million years, were found at the Xihoudu site in northern China.

“If you have a site in China that’s 2.43 million years old, and the origin of Homo erectus is 1.9 million years ago, either you need to push the origin of Homo erectus back to 2.5 or 2.6 million years or we need to accept that we need to be looking at other hominins that may have actually moved out of Africa,” explains Christopher Bae, a paleoanthropologist at the University of Hawai’i at Manoa and co-author of the new study.

Who created these 2-million-year-old tools remains a mystery, as no hominin fossils have been found at either site. However, if not Homo erectus, the most likely candidates would be earlier members of our genus, such as Homo habilis or Homo rudolfensis. This would suggest that the “Out of Africa” migration occurred multiple times throughout our genus’s history: once with early Homo, again with Homo erectus, and yet again with our own species.

“There could have been an earlier wave that died out or interbred, so there’s all kinds of possibilities open there,” adds Darryl Granger, a paleoanthropologist at Purdue University and also a co-author of the recent study.

The Dmanisi Debate

Even the classification of the Dmanisi fossils remains a subject of debate. While the Yunxian skull reconstructions agree on certain features, such as the relatively flat faces resembling our own and the 1.63-million-year-old Homo erectus skull from Gongwangling, the Dmanisi hominins exhibit a dramatically projecting lower face, characteristic of older hominin species.

Some paleoanthropologists classify the Dmanisi fossils as a distinct species, while others argue they represent early members of our genus, like Homo habilis or Homo rudolfensis. These earlier hominins may have possessed a greater capacity for migration and adaptation than previously recognized.

Looking Ahead: Further Exploration

Despite the wealth of evidence, it’s clear that our species evolved in Africa and subsequently spread to the rest of the world. However, it’s also increasingly evident that other hominin species inhabited various regions for extended periods before our arrival. The Yunxian skulls, and their revised age, play a crucial role in unraveling this complex story.

“Actually being able to anchor the Homo erectus sites with firm, solid dates helps us try to reconfigure this model,” says Bae. “This is where Yunxian really plays a major role in this. Now that we’ve got older dates to anchor the Yunxian Homo erectus fossils, I think we can really bring in this discussion with Xihoudu and Shangchen.”

The answers may lie buried in deeper sediment layers at sites like Yunxian and Gongwangling, potentially revealing artifacts and fossils from even earlier periods. Archaeologists may now prioritize exploring these previously overlooked layers, given the new evidence suggesting hominin presence in China dating back over 2 million years.

“People haven’t been looking for artifacts and fossils in two-plus million-year-old sediments in these locations in China,” says Granger. “I can think of places that I would like to go back and look if I had more time and money.”

Furthermore, researchers may re-examine fossil animal bones from the same age range as China’s oldest stone tools, investigating whether any of these bones might belong to early hominins rather than other mammals. Bae concludes, “It’s just that they haven’t been receiving any attention, or not enough attention.”

Science Advances, 2026. DOI: 10.1126/sciadv.ady2270