Unusual 100,000-Year-Old Human Skulls Found in China

Virtual reconstructions of the Xuchang 1 and 2 skulls, superimposed on the archeological site near Xuchang where they were discovered. Image Credit: Xiu-jie Wu

 
Hundreds of thousands of years ago, a variety of scruffy hominins roamed the planet, making tools, chasing down dinner, sitting around fires, and looking at the stars. Unfortunately, they didn’t leave much behind. Figuring out how and when these populations spread across the globe and intermingled with each other is a huge puzzle, one with most of the pieces missing.

That’s why scientists are excited about the discovery of two archaic human skulls in China reported in the journal Science today, March 2. These 100,000-year-old fossils have a mix of traits—and even some similarities with Neanderthals—which bolsters the idea that the precursors to modern humans were a diverse bunch who routinely interbred with one another.

Mental_floss spoke to report authors Erik Trinkaus, a professor of anthropology at Washington University in St. Louis, and paleoanthropologist Xiu-Jie Wu, of the Chinese Academy of Sciences in Beijing, as well as several experts in human evolution who were not involved in the current research.

The two broken skulls were discovered in the outskirts of Xuchang in central China at the Lingjing site, which was a spring for most of its history. The water consistently attracted people and animals over many millennia, and scientists have found at the site thousands bones of creatures like extinct deer and rhino relatives, as well as much more recent Bronze Age remains.

When the water table was lowered in the area in 2007, Lingjing became drier, and scientists were able to start an excavation, says Trinkaus. While digging, the researchers found the two skulls of archaic humans. They died in the Late Pleistocene, about 100,000 years ago.

“These were hunters and gatherers who, if you saw them, would look basically like people today,” Trinkaus says. “We would probably find them rather dirty and uncouth, but they were basically people.”

The skulls show that these almost-people have some similarities with early modern humans, including a large brain size and modest brow ridges. But they also have some important physical differences. Their low and broad braincase is characteristic of earlier, more primitive eastern Eurasian humans. Meanwhile, the shape of the semicircular canals (bones near the inner ear) and arrangement of the back of the skulls are similar to contemporary Neanderthals from western Eurasia.

This mosaic of physical features “suggests a pattern of regional population continuity in eastern Eurasia, combined with shared long-term trends in human biology and population connections across Eurasia,” says Wu. Those long-term trends include increasing brain size and decreasing massiveness of the skull—patterns that are also seen in humans in western Eurasia and Africa during this time period, which suggests some trends could be universal among humans, Trinkaus says.

The human-evolution experts we spoke to gave a number of reasons why the find is significant.

“It is a fascinating new discovery,” says Lynne Schepartz, a paleoanthropologist at the University of the Witwatersrand in South Africa. “The presence of the Neanderthal traits is very clear and, in my opinion, unquestionable. This discovery demonstrates the diversity of eastern Asian populations in the Late Pleistocene, reflecting their roots in earlier Homo erectus populations and then increased gene flow and interaction with peoples from the West.”

Fred Smith, an anthropologist at Illinois State University, says the skulls add to two growing points of consensus in paleoanthropology: “Neanderthals had extensive evolutionary influences beyond their core area of western Eurasia, and archaic human groups routinely hybridized with each other, and with early modern humans.”

In fact, this study highlights how the once-common image of Neanderthals as an anomalous European population, distinguished by a set of regional peculiarities, is now “looking increasingly dubious,” according to Boston University anthropologist Matt Cartmill. Instead, he says, recent research suggests that some of the traits we think of as unique to Neanderthals could have been widely distributed in late archaic human populations all across Eurasia. “I am beginning to wonder how useful the concept ‘Neanderthal’ is."

Other researchers say the skulls' combination of primitive features and Neanderthal-like traits should be somewhat expected in archaic humans in East Asia from this time period. “This is exactly what the Denisovans (an Asian sister group of the Western Eurasian Neanderthals) should be,” says Jean-Jacques Hublin, director of the department of Human Evolution at the Max Planck Institute for Evolutionary Anthropology in Germany.

The authors of the paper, however, have shied away from assigning a species name or category to these archaic humans just yet. Trinkaus says there isn’t enough known about the Denisovans and that using such a category would not be helpful for understanding the messy population dynamics of archaic humans.

“It’s not the kind of thing that you can make a simple diagram of with lines on a piece of paper,” he explains. “It’s a very complex process.”

But Trinkaus is hopeful that further research at Lingjing, along with discoveries elsewhere in China and East Asia, will shed more light on what these ancestral humans were like. “In the last couple of decades there’s been a renaissance of Pleistocene archaeology and paleontology in that part of the world,” he says.

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Drought Reveals Ancient Sites in Scotland That Can Only Be Spotted From the Air
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Typically rainy Scotland is in the middle of an unusually dry summer—and local archaeologists are taking advantage of it. As the BBC reports, the drought has revealed ancient sites, including Roman camps and Iron Age graves, that have been hidden by farm soil for years.

Historic Environment Scotland has been conducting aerial surveys of the country's landscape since the 1930s, but it's in seasons like this, when the crops recede during dry weather, that the buried remains of ancient structures are easiest to spot. Conditions this summer have been the best since 1976 for documenting archaeological sites from the sky.

Aerial view of field.
Historic Environment Scotland

The crescent-shaped crop mark in the photo above indicates a souterrain, or underground passageway, that was built in the Scottish Borders during the Iron Age. The surveyors also found remains of a Roman temporary camp, marked by straight lines in the landscape, built in modern-day Lyne—an area south of Edinburgh already known to have housed a complex of Roman camps and forts.

Aerial view of field.
Historic Environment Scotland

In the image below you'll see four small ditches—three circles and one square—that were likely used as burial sites during the Iron Age. When crops are planted over an ancient ditch, they have more water and nutrients to feed on, which helps them grow taller and greener. Such crops are especially visible during a drought when the surrounding vegetation is sparse and brown.

Aerial view of field.
Historic Environment Scotland

Historic Environment Scotland has a team of aerial surveyors trained to spot the clues: To date, they've discovered more than 9000 archaeological sites from the air. HSE plans to continue scoping out new areas of interest as long as the dry spell lasts.

It's not just in Scotland that long-hidden settlements are coming to light: similar aerial surveys in Wales are finding them too.

[h/t BBC]

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Billion-Year-Old Rocks Reveal the First Color Ever Produced by a Living Thing
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Billions of years ago, before there were plants and animals on Earth, there were rocks, tiny organisms, water, and not much else. It’s hard to envision what our barren planet looked like back then, but scientists now have some idea of what colors dominated the landscape.

As Vice reports, a team of researchers from Australian National University (ANU) were able to pinpoint the oldest colors ever produced by a living creature: purple-red hues dating back more than 1.1 billion years. The pigments, which appear pink when diluted, were found in molecular fossils of chlorophyll that had been preserved in rocks beneath the Sahara desert. A billion years ago, though, this area was “an ancient ocean that has long since vanished,” Nur Gueneli of ANU said in a statement.

Chlorophyll may very well be green, but these pinkish pigments are a result of "fossilized porphyrins, a type of organic compound that forms an atomic ring around a magnesium ion to form a chlorophyll molecule," Vice explains.

While this provides an interesting visual, the color itself is less important than what it reveals about some of the earliest life forms on Earth. Scientists determined that the chlorophyll was produced by ancient organisms called cyanobacteria, which derived energy via photosynthesis and ruled the oceans at that time, researchers wrote in a paper published in the Proceedings of the National Academy of Sciences. Larger planktonic algae—a potential food source for bigger life forms— were scarce, which may explain why large organisms didn’t roam the Earth a billion years ago. That kind of algae was about a thousand times larger than the cyanobacteria.

“The cyanobacterial oceans started to vanish about 650 million years ago, when algae began to rapidly spread to provide the burst of energy needed for the evolution of complex ecosystems, where large animals, including humans, could thrive on Earth," ANU associate professor Jochen Brocks said.

So the next time you encounter algae, you can thank it for helping you secure a spot on this planet.

[h/t Vice]

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