DNA reveals surprise ancestry of mysterious Chinese mummies

Since their discovery a century ago, hundreds of naturally preserved mummies found in China’s Tarim Basin have been a mystery to archaeologists. Some thought the Bronze Age remains were from migrants from thousands of kilometres to the west, who had brought farming practices to the area. But now, a genomic analysis suggests they were indigenous people who may have adopted agricultural methods from neighbouring groups.

As they report today in Nature1, researchers have traced the ancestry of these early Chinese farmers to Stone Age hunter-gatherers who lived in Asia some 9,000 years ago. They seem to have been genetically isolated, but despite this had learnt to raise livestock and grow grains in the same way as other groups.

The study hints at “the really diverse ways in which populations move and don’t move, and how ideas can spread with, but also through, populations”, says co-author Christina Warinner, a molecular archaeologist at Harvard University in Boston, Massachusetts.

The finding demonstrates that cultural exchange doesn’t always go hand in hand with genetic ties, says Michael Frachetti, an archaeologist at Washington University in St. Louis, Missouri. “Just because those people are trading, doesn’t necessarily mean that they are marrying one another or having children,” he says.

Perfect preservation environment

Starting in the early twentieth century, the mummies were found in cemeteries belonging to the so-called Xiaohe culture, which are scattered across the Taklamakan Desert in the Xinjiang region of China.

The desert “is one of the most hostile places on Earth”, says Alison Betts, an archaeologist at the University of Sydney in Australia.

Here, bodies had been buried in boat-shaped coffins wrapped in cattle hide. The hot, arid and salty environment of the desert naturally preserved them, keeping everything from hair to clothing perfectly intact. Before the latest study, “we knew an awful lot about these people, physically, but we knew nothing about who they were and why they were there”, says Betts.

The mummies — which were buried over a period of 2,000 years or more — date to a significant time in Xinjiang’s history, when ancient communities were shifting from hunter-gatherers to farmers, she adds.

Some of the later mummies were buried with woollen fabrics and clothing similar to those of cultures found in the west. The graves also contained millet, wheat, animal bones and dairy products — evidence of agricultural and pastoral technologies characteristic of cultures in other regions of Eurasia, which led researchers to hypothesize that these people were originally migrants from the west, who had passed through Siberia, Afghanistan or Central Asia.

The researchers behind the latest study — based in China, South Korea, Germany and the United States — took DNA from the mummies to test these ideas, but found no evidence to support them.

They sequenced the genomes of 13 individuals who lived between 4,100 and 3,700 years ago and whose bodies were found in the lowest layers of the Tarim Basin cemeteries in southern Xinjiang, as well as another 5 mummies from hundreds of kilometres away in northern Xinjiang, who lived between 5,000 and 4,800 years ago.

They then compared the genetic profiles of these people with previously sequenced genomes from more than 100 ancient groups of people, and those of more than 200 modern populations, from around the world.

Two groups of people

They found that the northern Xinjiang individuals shared some parts of their genomes with Bronze Age migrants from the Altai Mountains of Central Asia who lived about 5,000 years ago — supporting an earlier hypothesis.

But the 13 people from the Tarim Basin did not share this ancestry. They seem to be solely related to hunter-gatherers who lived in southern Siberia and what is now northern Kazakhstan some 9,000 years ago, says co-author Choongwon Jeong, a population and evolutionary geneticist at Seoul National University. The northern Xinjiang individuals also shared some of this ancestry.

Evidence of dairy products was found alongside the youngest mummies from the upper layers of cemeteries in the Tarim Basin, so the researchers analysed calcified dental plaque on the teeth of some of the older mummies to see how far back dairy farming went. In the plaque, they found milk proteins from cattle, sheep and goats, suggesting that even the earliest settlers here consumed dairy products. “This founding population had already incorporated dairy pastoralism into their way of life,” says Warinner.

But the study raises many more questions about how the people of the Xiaohe culture got these technologies, from where and from whom, says Betts. “That’s the next thing we need to try and resolve.”

The Immortal Armour of China Jade burial suits

Threaded hand-crafted from thousands of precious stone slabs with silver and gold during the Han Dynasty about 2000 years ago, ancient China’s jade burial suits were built as armour for the afterlife to prevent mortal decay.

The Jude Burial Suits of China are maybe the most opulent type of burial in history. Ceremonial suits composed of jade and gold thread were the chosen way of afterlife immortality for Han Dynasty China’s royal members.

Small discs strung onto necklaces as emblems of political power and religious authority, or ceremonial instruments like axes, knives, and chisels, were fashioned from nephrite jade.

Jade became associated with Chinese conceptions of the soul, protective properties, and immortality in the ‘essence’ of stone over time due to its hardness, durability, and delicate transparent hues (yu Zhi, shi Zhi jing ye).

With the rise of the Han Dynasty (China’s second imperial dynasty) in 202 BC-AD, 9 AD and AD 25 AD–220 AD, the association with jade’s longevity is clear from the text by the Chinese historian Sima Qian (145 – 86 BC) about Emperor Wu of Han (157 BC–87 BC), who was described as having a jade cup inscribed with the words “Long Life to the Lord of Men,” and indulging with an elixir of jade powder mixed with sweet dew.

Jade articles were first documented in literature around 320 AD, although there is archaeological evidence that they existed earlier than half a century.

However, their existence was not verified until 1968, when the tomb of Han Dynasty ruler Liu Sheng and his wife Princess Dou Wan was found.

The undisturbed tomb, said to be one of the most important archaeological findings of the twentieth century, was discovered in Hebei Province behind an iron wall between two brick walls and a passageway packed with stone.

They were composed of hundreds of tiny jade plates stitched together with gold thread. There were also jade pieces designed to conceal the eyes and plugs to fit into the eyes, ears, and other orifices.

All in the sake of keeping the bad at bay. Each suite is divided into twelve sections: the face, head, front and rear portions, arms, gloves, leggings, and feet. Liu Sheng’s outfit was very opulent. It was composed of 2498 pieces of jade that were stitched together with 1.1kg of gold thread and took an estimated 10 years to complete. On occasion, the remains were also placed in elaborate jade-covered coffins, which were equally spectacular, having been constructed with hundreds of solid gold nails.

Sets of instructions and standards for how the outfits should be made were also discovered. These rules are detailed in “The Book of Later Han.”

However, a study of the suits reveals that they were not always designed to meet the stated standards. The quality of the 15 outfits revealed varies.

The type of thread used was determined by the deceased’s status, according to Hu Hànsh (The Book of the Later Han). An emperor’s jade suit was threaded with gold, lessor royals and high-ranking nobles wore silver threaded jade suits, sons and daughters of the lessor wore copper threaded jade suits, and lower-ranked aristocrats wore silk threaded jade suits.

Emperor Wen of Wei ordered that the production of jade suits be stopped, as they encouraged tomb looters who would burn the suits to retrieve the gold thread in AD 223.

Jade failed to prevent soft tissue deterioration. Nonetheless, because jade is permeable, DNA from the royal pair may be entrenched in the stones for 2,000 years after their deaths, granting them a kind of immortality.

The largest animal-shaped bronze mythical beast unearthed at Sanxingdui

Chinese archaeologists have unearthed a big bronze beast – one of the most highly anticipated treasures of the Sanxingdui ruins – a year after spotting it in a pit at the mysterious site in Sichuan province.

The bronze was discovered in July last year, but archaeologists were not able to lift it out of the pit until Wednesday, when other bronze objects piled on top of the statue were removed.

The bronze animal is the biggest ever found in decades of digging at the site. It weighs around 150kg (330lbs) and has a large mouth, small waist, huge ears and four embellished hooves.

According to Zhao Hao, a Peking University archaeologist in charge of the pit that contained the object, all other bronze animals uncovered at the site since digging began in the 1980s measured around 20 to 30cm (7.9 to 11.8 inches).

“But this one is very large in size, with height and width both measuring about one metre (3.3 feet). It’s the only one at the whole site,” Zhao was quoted by state broadcaster CCTV as saying.

A human figurine was attached to what looks like a horn on the creature’s head. The figure was dressed in a long gown and appeared to be riding or controlling the animal.

Another human-shaped artefact was found lying by the animal’s side with its head missing. Human statuettes in different postures were also found nearby, which Zhao speculated could originally have been attached to the bronze beast’s body.

“A holy tree was cast on the chest of the animal, showing people in Sanxingdui worshipped the holy tree or treated it as a god,” Zhao was quoted as saying. “Such a configuration has not been found among any previously excavated artefacts. It’s extremely interesting.”

His team also speculated there could be a larger object that was attached to the beast’s back and has yet to be unearthed.

The Sanxingdui ruins, considered one of the most important archaeological discoveries of the 20th century, are believed to be at the heart of the mysterious Shu kingdom, which dates back some 4,500 years. But researchers have yet to find written records of the kingdom.

The ruins were discovered in the southwestern city of Guanghan in the late 1920s, but excavation work did not start until the 1980s, when archaeologists made a breakthrough and discovered two sacrificial pits containing more than 1,700 artefacts.

More than 400 class A artefacts – the most historically and culturally valuable, according to China’s classification system – were unearthed at the ruins during the first two decades of digging.

The excavation was paused in 2002, resuming only in 2020, after six more pits were identified. More than 13,000 artefacts have been uncovered since then, including a bronze sacrificial altar with human figures, a bronze sculpture with a human head and snake body and a dragon-shaped bronze statue with a pig’s nose.

This round of field excavation work will be completed in September, after which archaeologists will begin restoring, categorising and researching the newly uncovered artefacts.

Hell’s Shells: 90 Million-Year-Old Egg From Turtle Bigger Than Humans

A giant fossilized turtle egg — believed to have been laid by a turtle the length of a fully grown human 90 million years ago — has been found with the embryo inside.

The tennis ball-sized egg, which is protected by an unusually thick outer shell, was found in 2018 by a farmer in China’s Henan Province, who sent it to a university for analysis.

The research team, which included scientists from the China University of Geosciences in Wuhan, the Henan Geological Museum and Canada’s Royal Ontario Museum, carried out CT scans on the egg.

The scans revealed that within the thick fossilized shell, a turtle embryo that was 85 per cent developed had been preserved.

Further examination revealed that the embryo was probably a member of the Yuchelys nanyangensis species, which went extinct during the Cretaceous period 66 million years ago. The fossilized find is also believed to be part of the Nanhsiungchelyidae, an extinct family of land turtles from the Cretaceous period that were native to Asia and North America.

Such turtles were flat-shelled and lived on dry land, which was unusual at the time, said Darla Zelenitsky, a researcher from the Canada’s University of Calgary.

While thousands of dinosaur eggs have been found in Henan Province over the past 30 years, Zelenitsky said they are rarely found in good condition.

“In comparison with dinosaur eggs, turtle eggs — especially those with preserved embryos — rarely fossilize because they’re so small and fragile,” she said.

Zelenitskythey said that this egg likely survived because of its unusually thick shell, which the research team measured at 0.07 inches, several times thicker than the eggs of Galapagos turtles at 0.01 inches.

Judging by the size of the shell, the team estimated that it was laid by a turtle with a 5.3-foot-long carapace, meaning that from its neck to its tail, it would have been longer than some humans are tall.

Zelenitsky said that part of the shell was broken from the inside, so it’s possible that the embryo tried to hatch but has been trapped in its shell for 90 million years.

The study was published online on Aug. 18 in the journal Proceedings of the Royal Society B: Biological Sciences.

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