Ancient Mongolian skull is the earliest modern human yet found in the region

Ancient Mongolian skull is the earliest modern human yet found in the region
Salkhit skullcap © Maud Dahlem, Muséum de Toulouse (France). Credit: © Maud Dahlem, Muséum de Toulouse (France)

A much debated ancient human skull from Mongolia has been dated and genetically analysed, showing that it is the earliest modern human yet found in the region, according to new research from the University of Oxford. Radiocarbon dating and DNA analysis have revealed that the only Pleistocene hominin fossil discovered in Mongolia, initially called Mongolanthropus, is in reality a modern human who lived approximately 34—35 thousand years ago.

The skullcap, found in the Salkhit Valley northeast Mongolia is, to date, the only Pleistocene hominin fossil found in the country.

The skullcap is mostly complete and includes the brow ridges and nasal bones. The presence of archaic or ancient features have led in the past to the specimen being linked with uncharacterized archaic hominin species, such as Homo erectus and Neanderthals. Previous research suggested ages for the specimen ranging from the Early Middle Pleistocene to the terminal Late Pleistocene.

The Oxford team re-dated the specimen to 34,950—33,900 years ago. This is around 8,000 years older than the initial radiocarbon dates obtained on the same specimen.

To make this discovery, the Oxford team employed a new optimised technique for radiocarbon dating of heavily contaminated bones. This method relies on extracting just one of the from the collagen present in the bone. The amino acid hydroxyproline (HYP), which accounts for 13% of the carbon in mammalian collagen, was targeted by the researchers. Dating this amino acid allows for the drastic improvement in the removal of modern contaminants from the specimens.

Ancient Mongolian skull is the earliest modern human yet found in the region
View of the find spot in the Salkhit Valley, Mongolia © Institute of History and Archaeology & Academy of Sciences (Mongolia). Credit: © Institute of History and Archaeology & Academy of Sciences (Mongolia)

The new and reliable radiocarbon date obtained for the specimen shows that this individual dates to the same period as the Early Upper Palaeolithic stone tool industry in Mongolia, which is usually associated with modern humans. The age is later than the earliest evidence for anatomically in greater Eurasia, which could be in excess of 100,000 years in China according to some researchers.

This new result also suggests that there was still a significant amount of unremoved contamination in the sample during the original radiocarbon measurements. Additional analyses performed in collaboration with scientists at the University of Pisa (Italy) confirmed that the sample was heavily contaminated by the resin that had been used to cast the specimen after its discovery.

"The research we have conducted shows again the great benefits of developing improved chemical methods for dating prehistoric material that has been contaminated, either in the site after burial, or in the museum or laboratory for conservation purposes." said Dr. Thibaut Devièse first author on the new paper and leading the method developments in compound specific analysis at the University of Oxford. "Robust sample pretreatment is crucial in order to build reliable chronologies in archaeology."

DNA analyses were also performed on the hominin bones by Professor Svante Pääbo's team at the Max-Planck Institute for Evolutionary Anthropology in Leipzig, Germany. Diyendo Massiliani and colleagues reconstructed the complete mitochondrial genome of the specimen. It falls within a group of modern human mtDNAs (haplogroup N) that is widespread in Eurasia today, confirming the view of some researchers that the cranium is indeed a modern human. Further nuclear DNA work is underway to shed further light on the genetics of the cranium.

'This enigmatic cranium has puzzled researchers for some time", said Professor Tom Higham, who leads the PalaeoChron research group at the University of Oxford. "A combination of cutting edge science, including and genetics, has now shown that this is the remain of a modern human, and the results fit perfectly within the archaeological record of Mongolia which link moderns to the Early Upper Palaeolithic industry in this part of the world.'

The research has been published in the journal Nature Communications.


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More information: Nature Communications (2019). www.nature.com/articles/s41467-018-08018-8
Journal information: Nature Communications

Citation: Ancient Mongolian skull is the earliest modern human yet found in the region (2019, January 30) retrieved 15 October 2019 from https://phys.org/news/2019-01-ancient-mongolian-skull-earliest-modern.html
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Jan 30, 2019
With those brow ridges and a near-total lack of forehead, it looks very much more like Neandertal than modern home sapiens.

Jan 30, 2019
Considering the errors made when this specimen was dug up?
I would want a full crystallography x-ray & a professional forensic reconstruction of the skull/

Before accepting what may turn out to have been dubious opinions by the original archeologists.

In addition to DNA testing. Possibly this guy was just born ugly?
That part of Asia he was found? Wouldn't Denisovan be more likely than Neanderthal?
Or even that new claim of hybrid of Neanderthal & Denisovan?

Or, as in the old Playboy cartoon. Of a chimera conversing to a cupid.
"Mother would never talk about that orgy!"

A menagerie du triage of all the available Hominid species?

rhugh, Making too much of superficial physical characteristics?
Reveals more about yourself than the museum exhibit.
The pseudo-science of eugenics has resulted in horrible examples of domesticated animals. Race horses would be extinct if the gambling syndicates hadn't strong-armed the breeders to accept modern genetics.

Jan 30, 2019
Yes, the supra-orbital torus of the Mongolian skull suggests it might have been neandertal or denisovan rather than sapiens. For the anatomical differences between neandertals (& denisovans?) and sapiens, google "caostal dispersal 2018 Verhaegen".

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