What do 1,300 Denisovan stone tools tell us?

They confirm that Denisovans manufactured and used stone tools in Yunnan — something inferred from multi-occupant sites but never directly confirmed in a single-occupant stratigraphic context. The assemblage is flake-based, made from local river cobbles, and is the first lithic industry attributable to Denisovans with reasonable archaeological confidence.

1,300 Denisovan stone tools and the first-ever forearm bone emerge from a bat cave in China

For decades, nearly everything known about Denisovans came from a handful of bone and tooth fragments found in a single cave in the Altai Mountains of Siberia. The Denisova Cave gave the species its name — and, because of the exceptional preservation of ancient DNA at that elevation, its molecular identity. But a skeleton they did not have. An arm they had never found. A stone tool made by their hands had never been identified in a controlled excavation context.

A team from the Institute of Vertebrate Paleontology and Paleoanthropology at the Chinese Academy of Sciences has now identified five Denisovan specimens — including the first forearm bone ever recovered from these ancient humans — inside a limestone cave in Yunnan Province, southwestern China. Alongside them: more than 1,300 stone tools that preserve, for the first time, a direct archaeological record of Denisovan behavior.

What was found at Bianfu Cave

Bianfu Cave — the name means “bat cave” in Mandarin — sits in Yunnan Province, near the point where southwest China approaches the borders of Southeast Asia. Excavations recovered more than 60,000 bone fragments from Pleistocene sediments. The vast majority were animal remains — cave bears, hyenas, ungulates — but a systematic screening program singled out a smaller set for closer analysis.

From that screening, five specimens were assigned to Denisovans: two skull fragments, one radius (the forearm bone), and two teeth. The radius is the first forearm bone ever recovered from a Denisovan individual anywhere. It is also the longest Denisovan limb bone yet found — a specimen solid enough to allow direct comparison of its shape against Neanderthal and modern human forearm anatomy.

The sediment layers enclosing the specimens were dated to between approximately 167,000 and 134,000 years ago — Marine Isotope Stage 6, a cold period when much of the Northern Hemisphere lay under glacial ice and human populations across Eurasia were pushing the edges of their range.

How they identified the bones

Identifying archaic human material inside tens of thousands of mixed bone fragments requires a molecular approach. The IVPP team used two complementary techniques.

The first, Zooarchaeology by Mass Spectrometry — ZooMS — extracts short collagen peptides from bone and screens them against a reference library of known protein sequences. Different species produce slightly different peptide patterns; ZooMS can flag human-like collagen even from fragments too small or too poorly preserved for DNA analysis. The ZooMS pass identified a set of candidate specimens as hominin.

The second technique, paleoproteomic analysis, resolved the species assignment. Ancient proteins in bones survive longer than DNA in warm-latitude sediments. By sequencing protein fragments and comparing them against reference databases, the team confirmed that the five specimens carried the protein signatures characteristic of Denisovans as known from the Altai material — not modern humans, not Neanderthals.

This double confirmation — ZooMS triage followed by proteomics identity check — is becoming the standard workflow for sites where DNA preservation is too poor for genetic methods. Yunnan’s subtropical climate makes DNA survival at these depths essentially impossible; the same protein-based approach has opened several East Asian sites to systematic screening that would otherwise have remained molecularly opaque.

The cultural record: 1,300 stone tools

The 1,300 stone tools recovered from the same stratigraphic levels as the Denisovan specimens represent the first time a lithic industry has been associated with this hominin group in a controlled excavation context. The original Denisova Cave yielded tools — but disentangling which artifacts were made by Denisovans versus Neanderthals or modern humans in that multi-occupant site is methodologically complex.

Bianfu Cave presents a cleaner picture. The five hominin specimens are the only non-modern-human presence detected in the relevant layers, and the stone tool assemblage directly overlies or shares those levels.

The assemblage is predominantly flake-based — struck stone tools produced from locally available river cobbles — with retouched pieces consistent with scraping and cutting tasks. No evidence of blade technology or long-distance raw material transport has been reported. The toolkit is pragmatic and locally adapted, suggesting Denisovans at Bianfu Cave exploited regional resources with efficient, locally sourced stone.

What the anatomy reveals about Denisovan bodies

The Bianfu Cave radius adds measurably to what is known about Denisovan morphology. Before this find, the physical description of Denisovans rested almost entirely on DNA inference — comparisons with Neanderthals based on shared and divergent genomic variants — plus the molecular analysis of the original finger bone and teeth from Denisova Cave.

The radius from Yunnan is robustly built. In cross-sectional shape it resembles Neanderthal forearm bones more closely than those of modern humans — consistent with heavy limb use or powerful upper-body activity. But in overall proportions the bone falls within a range that overlaps modern human anatomy, suggesting Denisovans were not simply eastern Neanderthals in morphology. They were, as the DNA had indicated, a distinct lineage with a shared but separate evolutionary history.

Bianfu Cave now stands as the second-richest Denisovan site in the world by specimen count, behind only Denisova Cave itself. Combined with the Xiahe jaw from the Tibetan Plateau — identified via proteomics and dating to around 160,000 years ago — the picture of Denisovans across East and Southeast Asia is beginning to have a spatial footprint.

Common questions about Denisovans

Who were the Denisovans?

Denisovans were an archaic human population closely related to Neanderthals. They are defined primarily by their DNA — extracted from a finger bone, teeth, and a partial skull fragment found in Denisova Cave in Siberia. They split from the lineage leading to Neanderthals roughly 400,000 years ago. Modern humans in parts of Asia and the Pacific carry up to five percent Denisovan ancestry from ancient interbreeding events.

Why is the forearm bone significant?

Before Bianfu Cave, no Denisovan limb bone had been identified. Limb bones allow researchers to compare body proportions and usage patterns between species — something previously impossible for Denisovans. The Bianfu Cave radius gives the first direct anatomical measurement of a Denisovan arm.

What do 1,300 stone tools tell us?

They confirm that Denisovans manufactured and used stone tools in this region of China — something inferred from their presence in multi-occupant sites but never directly confirmed in a single-occupant stratigraphic context. The Bianfu Cave assemblage is the first lithic industry that can be attributed to Denisovans with reasonable archaeological confidence.

What comes next

The Bianfu Cave material extends the known geographic range of Denisovans significantly southward — from Siberia to subtropical Yunnan. Whether the species ranged further into Southeast Asia, and for how long, remains an open question that current excavation at related sites is beginning to address.

The protein-based identification method used at Bianfu Cave is being applied systematically at cave sites across southern China and mainland Southeast Asia. Several sites have already yielded hominin collagen signals; species assignments are pending publication.

The complete morphological description of the Bianfu Cave specimens, including detailed comparative anatomy of the radius, is expected to appear as a companion study.

Reference: Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, “Denisovan specimens from Bianfu Cave, Yunnan Province,” Nature, 2026. DOI: 10.1038/s41586-026-10976-9

Tags: archaeology, human evolution, Bianfu Cave, Denisovans, paleoproteomics, stone tools