298 Million Year Old Forest Found Beneath Coal Mine in China

A tropical forest 300 millions of years old, has been preserved in ash when a volcano exploded in the north of China today.

The reconstruction of this fossilized forest is presented through a new study by Hermann Pfefferkorn, a paleobotanist from the University of Pennsylvania, which lending insight into the ecology and climate of its time.

Pfefferkorn, a professor in Penn’s Department of Earth and Environmental Science, collaborated on the work with three Chinese colleagues: Jun Wang of the Chinese Academy of Sciences, Yi Zhang of Shenyang Normal University and Zhuo Feng of Yunnan University.

Their paper was published this week in the Early Edition of the Proceedings of the National Academy of Sciences.

The study site, located near Wuda, China, is unique as it gives a snapshot of a moment in time. Because volcanic ash covered a large expanse of forest in the course of only a few days, the plants were preserved as they fell, in many cases in the exact locations where they grew.

“It’s marvelously preserved,” Pfefferkorn said. “We can stand there and find a branch with the leaves attached, and then we find the next branch and the next branch and the next branch. And then we find the stump from the same tree. That’s really exciting.”

The researchers also found some smaller trees with leaves, branches, trunk, and cones intact, preserved in their entirety.

Due to nearby coal-mining activities unearthing large tracts of rock, the size of the researchers’ study plots is also unusual. They were able to examine a total of 1,000 m2 of the ash layer in three different sites located near one another, an area considered large enough to meaningfully characterize the local paleoecology.

The fact that the coal beds exist is a legacy of the ancient forests, which were peat-depositing tropical forests. The peat beds, pressurized over time, transformed into the coal deposits.

The scientists were able to date the ash layer to approximately 298 million years ago. That falls at the beginning of a geologic period called the Permian, during which Earth’s continental plates were still moving toward each other to form the supercontinent Pangea. North America and Europe were fused together, and China existed as two smaller continents. All overlapped the equator and thus had tropical climates.

At that time, Earth’s climate was comparable to what it is today, making it of interest to researchers like Pfefferkorn who look at ancient climate patterns to help understand contemporary climate variations.

In each of the three study sites, Pfefferkorn and collaborators counted and mapped the fossilized plants they encountered. In all, they identified six groups of trees. Tree ferns formed a lower canopy while much taller trees — Sigillaria and Cordaites — soared to 80 feet above the ground. The researchers also found nearly complete specimens of a group of trees called Noeggerathiales. These extinct spore-bearing trees, relatives of ferns, had been identified from sites in North America and Europe but appeared to be much more common in these Asian sites.

They also observed that the three sites were somewhat different from one another in plant composition. In one site, for example, Noeggerathiales were fairly uncommon, while they made up the dominant plant type in another site. The researchers worked with painter Ren Yugao to depict accurate reconstructions of all three sites.

“This is now the baseline,” Pfefferkorn said. “Any other finds, which are normally much less complete, have to be evaluated based on what we determined here.”

The findings are indeed “firsts” on many counts.

“This is the first such forest reconstruction in Asia for any time interval, it’s the first of a peat forest for this time interval and it’s the first with Noeggerathiales as a dominant group,” Pfefferkorn said.

Because the site captures just one moment in Earth’s history, Pfefferkorn noted that it alone cannot explain how climate changes affected life on Earth. But it helps provide valuable context.

“It’s like Pompeii: Pompeii gives us deep insight into Roman culture, but it doesn’t say anything about Roman history in and of itself,” Pfefferkorn said. “But on the other hand, it elucidates the time before and the time after. This finding is similar. It’s a time capsule and therefore it allows us now to interpret what happened before or after much better.”

The study was supported by the Chinese Academy of Science, the National Basic Research Program of China, the National Natural Science Foundation of China and the University of Pennsylvania.

12,000-Year-Old Elongated Skulls Discovered in Asia Stun Experts

A new study has found that elderly people in China had a human head shaping about 12,000 years ago — meaning they bound some children’s maturing skulls, encouraging the heads to grow into elongated ovals — making them the oldest group on record to purposefully squash their skulls, a new study finds.

While excavating a Neolithic site (the last period of the Stone Age) at Houtaomuga, Jilin province, in northeast China, the archaeologists found 11 elongated skulls — belonging to both males and females and ranging from toddlers to adults — that showed signs of deliberate skull reshaping, also known as intentional cranial modification (ICM).

“This is the earliest discovery of signs of intentional head modification in Eurasia continent, perhaps in the world,” said study co-researcher Qian Wang, an associate professor in the Department of Biomedical Sciences at the Texas A&M University College of Dentistry.

“If this practice began in East Asia, it likely spread westward to the Middle East, Russia, and Europe through the steppes as well as eastward across the Bering land bridge to the Americas.” 

The Houtaomuga site is a treasure trove, holding burials and artifacts from 12,000 to 5,000 years ago.

During an excavation there between 2011 and 2015, archaeologists found the remains of 25 individuals, 19 of which were preserved enough to be studied for ICM.

After putting these skulls in a CT scanner, which produced 3D digital images of each specimen, the researchers confirmed that 11 had indisputable signs of skull shaping, such as flattening and elongation of the frontal bone, or forehead.

The oldest ICM skull belonged to an adult male, who lived between 12,027 and 11,747 years ago, according to radiocarbon dating.

Archaeologists have found reshaped human skulls all around the world, from every inhabited continent. But this particular finding, if confirmed, “will [be] the earliest evidence of the intentional head modification, which lasted for 7,000 years at the same site after its first emergence,” Wang told Foxnews.

The 11 ICM individuals died between ages 3 and 40, indicating that skull shaping began at a young age when human skulls are still malleable, Wang said.

It’s unclear why this particular culture practiced skull modification, but it’s possible that fertility, social status, and beauty could be factors, Wang said. The people with ICM buried at Houtaomuga were likely from a privileged class, as these individuals tended to have grave goods and funeral decorations.

“Apparently, these youth were treated with a decent funeral, which might suggest a high socioeconomic class,” Wang said.

Even though the Houtaomuga man is the oldest known case of ICM in history, it’s a mystery whether other known instances of ICM spread from this group, or whether they rose independently of one another, Wang said.

“It is still too early to claim intentional cranial modification first emerged in East Asia and spread elsewhere; it may have originated independently in different places,” Wang said. More ancient DNA research and skull examinations throughout the world may shed light on this practice’s spread, he said.