New studies reveal deep history of archaic humans in southern Siberia

New studies reveal deep history of archaic humans in southern Siberia
Initial Upper Palaeolithic pendant being sampled. Credit: Tom Higham, University of Oxford

Oxford University scientists have played a key role in new research identifying the earliest evidence of some of the first known humans—Denisovans and Neanderthals, in Southern Siberia.

Professor Tom Higham and his team at the Oxford Radiocarbon Accelerator Unit at the University of Oxford worked in collaboration with a multi-disciplinary team from the UK, Russia, Australia, Canada and Germany, on the detailed investigation over the course of five years, to date the archaeological site of Denisova cave. Situated in the foothills of Siberia's Altai Mountains, it is the only site in the world known to have been occupied by both archaic human groups (hominins) at various times.

The two new studies published in Nature, now put a timeline on when Neanderthals and their enigmatic cousins, the Denisovans, were present at the site and the environmental conditions they faced before going extinct.

Denisova cave first came to worldwide attention in 2010, with the publication of the genome obtained from the fingerbone of a girl belonging to a group of humans not previously identified in the palaeoanthropological record; the Denisovans. Further revelations followed on the genetic history of Denisovans and Altai Neanderthals, based on analysis of the few and fragmentary hominin remains. Last year, a bone fragment discovered by researchers at Oxford's Research Laboratory for Archaeology and the History of Art and the University of Manchester, yielded the genome of the daughter of Neanderthal and Denisovan parents—the first direct evidence of interbreeding between two archaic hominin groups. But reliable dates for the hominin fossils recovered from the cave have remained elusive, as have dates for the DNA, artefacts, and animal and plant remains retrieved from the sediments.

New studies reveal deep history of archaic humans in southern Siberia
Bone points and pierced teeth from the early Upper Palaeolithic layers of Denisova Cave sampled for radiocarbon dating. Credit: Katerina Douka

Excavations for the past 40 years led by Professors Anatoly Derevianko and Michael Shunkov from the Institute of Archaeology and Ethnography (Siberian Branch of the Russian Academy of Sciences) in Novosibirsk, revealed the longest archaeological sequence of Siberia.

In the new research, the Oxford team obtained fifty from bone, tooth and charcoal fragments recovered from the upper layers of the site, as part of the ERC funded 'PalaeoChron' project. In addition to these, more than 100 optical ages were obtained for the cave sediments, most of which are too old for radiocarbon dating, by researchers at the University of Wollongong in Australia. A minimum age for the bone fragment of mixed Neanderthal/Denisovan ancestry was also obtained by uranium-series dating by another Australian team. "This is the first time we are able to confidently assign an age to all archaeological sequence of the cave and its contents" said Professor Higham.

To determine the most probable ages of the archaic hominin fossils, a novel Bayesian model was developed by the Oxford team that combined several of these dates with information on the stratigraphy of the deposits and genetic ages for the Denisovan and Neanderthal fossils relative to each other—the latter based on the number of substitutions in the mitochondrial DNA sequences, which were analysed by the Max Planck Institute for Evolutionary Anthropology in Germany.

New studies reveal deep history of archaic humans in southern Siberia
Natalia Belousova (Russian Academy of Sciences) and Tom Higham taking samples from the Main Chamber at Denisova Cave. Credit: Sergey Zelinski, Russian Academy of Sciences

The improved age estimates for the obtained using the novel Bayesian age model, "incorporates all of the dating evidence available for these small and isolated fossils, which can sometimes be displaced after deposition in a cave sequence" said Dr. Katerina Douka (Max Planck Institute for the Science of Human History, Germany), lead author of the study that reports the new radiocarbon dates and the human fossils age estimates.

"This new chronology for Denisova Cave provides a timeline for the wealth of data generated by our Russian colleagues on the archaeological and environmental history of the cave over the past three glacial-interglacial cycles" said lead author of the optical dating study, Professor Zenobia Jacobs of the University of Wollongong in Australia.

The new studies show that the cave was occupied by Denisovans from at least 200,000 years ago, with stone tools in the deepest deposits suggesting human occupation may have begun as early as 300,000 years ago. Neanderthals visited the site between 200,000 and 100,000 years ago, with "Denny", the girl of mixed ancestry, revealing that the two groups of hominins met and interbred around 100,000 years ago.

New studies reveal deep history of archaic humans in southern Siberia
Entrance to Denisova Cave. Credit: Richard (Bert) Roberts

Most of the evidence for Neanderthals at Denisova Cave falls within the last interglacial period around 120,000 years ago, when the climate was relatively warm, whereas Denisovans survived through much colder periods, too, before disappearing around 50,000 years ago.

Modern humans were present in other parts of Asia by this time, but the nature of any encounters between them and Denisovans remains open to speculation in the absence of any fossil or genetic traces of modern humans at the site.

The Oxford team also identified the earliest evidence thus far in northern Eurasia for the appearance of bone points and pendants made of animal teeth that are usually associated with modern humans and signal the start of the Upper Palaeolithic. These date to between 43,000 and 49,000 years ago.

New studies reveal deep history of archaic humans in southern Siberia
Laser beam used for optical dating at the University of Wollongong, Australia. Credit: Erich Fisher

So, 'while these new studies have lifted the veil on some of the mysteries of Denisova Cave, other intriguing questions remain to be answered by further research and future discoveries' said Professor Richard 'Bert' Roberts, a co-author on the two papers.

Professor Higham commented that 'it is an open question as to whether Denisovans or modern humans made these personal ornaments found in the . We hoping that in due course the application of sediment DNA analysis might enable us to identify the makers of these items, which are often associated with symbolic and more complex behaviour in the archaeological record'.


Explore further

A fourth Denisovan fossil has been identified

More information: Timing of archaic hominin occupation of Denisova Cave in southern Siberia, DOI: 10.1038/s41586-018-0843-2 , https://www.nature.com/articles/s41586-018-0843-2

Age estimates for hominin fossils and the onset of the Upper Palaeolithic at Denisova Cave, DOI: 10.1038/s41586-018-0870-z , https://www.nature.com/articles/s41586-018-0870-z

Journal information: Nature

Citation: New studies reveal deep history of archaic humans in southern Siberia (2019, January 30) retrieved 22 April 2019 from https://phys.org/news/2019-01-reveal-deep-history-archaic-humans.html
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Jan 30, 2019
They may have been created by modern man and traded or acquired them through other means. The DNA of the people who used them last doesn't prove who created them, only that they were appreciated by them.

Jan 30, 2019
ahh jeff, are you commenting about the late period artifacts found which are believed to be of Modern Human creativity?

Or. are you commenting on the article writer's terminology, conflating & overlapping the three hominid populations?

Or, are you uncomfortable with the thought that these were. all together, three separate lineages of the same Human Species? Who sometimes interbred. Leaving traceable DNA in Modern Humans?

Being able to interbreed is one of the key definitions of species. When evolution is resulting in an ancestral species splitting into two mew species?
Sometimes the two groups can still interbreed but result in infertile offspring.

Such as a horse & ass producing a mule or jenny.

Sexual reproduction is a crapshoot. Of the Neans & Dens had been separate species from Modern Homo Anthropophagus?
We would probably NOT be carrying their genes & be able to reproduce.

Sixumpteen billion humans say that's a losing argument.

Jan 31, 2019
Once one comes to the realization that biological life as we know it could not have arisen by itself without any outside intelligent and powerful help, then it also becomes clear that the evolutionary story is just a lot of hot gas.
Hence all the 200k etc. years given here are really totally laughable if it weren't such a sad indictment of just how misled human beings are about their origins.

We were created by the Creator about 6000 years ago. For those who treat such an idea with contempt - please just go and investigate Genetic Entropy and see for yourself that with such a rapid decline in integrity none of the genomes (human or otherwise) could have existed for the time spans mentioned here.

To make it even worse, where are all the people that should have been around if these figures were true? The human population should have been absolutely ginormous even with the lowest imaginable growth rates. Get real people, this story in the article NEVER happened.

Jan 31, 2019
Ahh, KAYLEE & fredjose,
Please to allow me to be the first on the phys.org site, to express my personal condolences for your imminent nuptials.

You crazy kids go have a funtastic honeymoon!

I suggest the Hellas Planitia. The Trump Resort & Golf Course has all the amenities of home.
If you live in the Trump White House.
Such as a Russian Mob Casino & Saudi Sex-Slave Seraglio.

Please,enjoy yourself. There is no rush to return. We'll somehow try to get along without you for hopefully the foreseeable future?

You sweet kids should ignore all those ugly rumors about Trump hiring illegal aliens.
Fake News & old news at that. A bribe here & a bribe there & it's all fixed.

Look, the Mars Supials fur is orange & minimally dyed.

There's just some sort of red-tape mix-up.
The Trump employees are not illegals. They are merely undocumented.
Undoubtedly sabotaged by evil liberal bureaucrats.

& their children as hostages? They love being kept in cages!

Jan 31, 2019
biological life as we know it could not have arisen by itself


Correct, it must have been a natural process.

And we now know it arose by evolution all the way: https://www.natur...l2016116 , so the question which process is solved.

But that has that got to do with methods and results of archaeological and evolutionary dating as the article discussed? You are not simply trolling irrelevancies, are you!?

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