Before the Great Wall: Chinese Rulers Carved Shallow Grooves

Excavation of Mongolia’s medieval wall system by archaeologists

Gideon Shelach-Lavi et al. 2025

Long before the construction of the Great Wall of China, other significant walls were erected on the Eurasian steppes, not with the intent of safeguarding the Mongolian army. Recent diggings indicate that they were established to regulate movement and to showcase power, similar to modern boundary walls.

The Great Wall of China spans thousands of kilometers, with its longest segment measuring approximately 8,850 kilometers. This section originates from the Ming Dynasty (1368-1644 AD) and served as a physical barrier against Mongol incursions.

In contrast to large fortifications, the earlier systems consist of a network of trenches, walls, and enclosures approximately 4,000 km wide across northern China, Mongolia, and Russia.

This infrastructure was developed between the 10th and 12th centuries by various dynasties, primarily the Jin Dynasty (1115-1234 AD). It was primarily constructed by the people of Siberia and the Zurchen from northeastern China, who were herders.

Gideon Shelach-Lavi from The Hebrew University of Jerusalem, along with his team, has utilized satellite imagery and drones to explore and map these ancient walls. They are now investigating a 405 km section excavated in Mongolia, including one of the enclosures.

The structure features a trench about 1 meter deep and 3 meters wide, with the earth piled on one side, forming a compact earth wall that stands 1-2 meters tall. At intervals, a thick square stone enclosure approximately 30 meters wide was added along the wall.

The purpose of these walls is still unclear, as historical records are scarce, and they were not built at natural geographical divides, according to Shelach-Lavi.

Many historians believed they were constructed to thwart Genghis Khan’s army, which reigned over the Mongol Empire from 1206 to 1227. However, Sherach Ravi asserts that these structures would not have been particularly effective for defense. “They were not designed to repel military invasions,” he states.

Instead, he theorizes that the walls were primarily a demonstration of power — showing that the region was under the control of the Jin Dynasty. The walls allowed for the regulation of people through the enclosure gates, managing the flow of people, goods, and animals. He suggests that even though they may not have stopped armies, the walls might have been effective in preventing smaller attacks.

“The objective seems to be guiding individuals towards these enclosures, allowing for control and taxation,” he explains. “It’s all about monitoring movement, which is not so different from what we observe today.”

The findings at the enclosure also illuminate the lifestyle of the inhabitants. “This is a picturesque area,” remarks Sherach Ravi. “We have uncovered extensive evidence of livestock grazing, hunting, and fishing.”

Moreover, within the enclosure, researchers discovered stone platforms or benches that could have served as stoves or beds for the Han Chinese during the Song Dynasty, who were in conflict with the Jin Dynasty.

This suggests that significant resources went into building and maintaining garrisons, indicating that people lived there year-round and engaged in agriculture. “This is remarkable, as even today, farming activities are minimal in this region,” he notes.

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Source: www.newscientist.com

Newly Discovered Shallow Water Fish Species in Portugal

Paleontologists have announced the discovery of a new genus and species of Balacromian Ikuchosaur, based on a fossilized skull found in the Agua de Maderos Formation in Portugal.



Gadusaurus Aqualigneus. Image credit: Pratas e Sousa et al., doi: 10.4202/app.01199.2024.

The newly identified species thrived in the early Jurassic oceans around 193 million years ago.

It has been scientifically designated as Gadusaurus Aqualigneus; this marine reptile is a small Ikchosaur, measuring approximately 2 m (6.6 feet) in length.

“Iktiosaurus was a group of Mesozoic reptiles renowned for their adaptation back to marine life,” explained Dr. Joan Platas et Sousa, a researcher from Nova de Lisboa University.

“These creatures existed from the early Triassic to the late Cretaceous, but early Jurassic fish fauna is most commonly found in the European fossil record.”

“While some western regions are rich in marine deposits, southern areas like the Iberian Peninsula (encompassing Portugal and Spain) have very few and fragmented records.”

The nearly complete skull of Gadusaurus Aqualigneus was found in a planarized state, measuring about 35.2 cm (13.9 inches) in length, in the Agua de Madeiros Formation in 2021.

“The specimens we analyzed were collected in mainland Portugal, specifically in the San Pedro de Moel area,” the paleontologist stated.

“The fossil block was located in the sands of Agua de Maderos Beach, at a stream marking the boundary between Marinha Grande and Alcobaza municipalities.”

“This region lies within the Lusitania Basin, which is situated on the passive margin of Western Iberia in the Atlantic, providing exceptional marine records from the Lower Jurassic,” they added.

“The Lusitania Basin is a long, narrow structure bordered to the east by the Iberia Massif and to the west by the Valiskan Berrenga Horst.”

“The basin’s development coincided with the opening of the Atlantic Ocean, displaying various sedimentary facies from the upper Triassic to the upper Cretaceous.”

Phylogenetic analysis places Gadusaurus Aqualigneus within the Ichthyosaur Clade Baracromia, part of the Neoichthyosaur and Parvipelvia Clades.

“This specimen represents the most complete and well-preserved remains of Uoshima described so far on the Iberian Peninsula,” the researchers noted.

“Moreover, it is the first new species of this marine reptile group documented in Iberia.”

“This specimen predates the Toarcian Marine Anoxia Event, which is believed to have affected the lifestyle of later Ichthiosaurus species.”

“It’s reasonable to assume that ecological events during this period may have similarly influenced the lifestyle of this type, though further studies are essential.”

The discovery of Gadusaurus Aqualigneus will be detailed in a new paper published online in the journal Acta Palaeontologica Polonica.

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J. Platas E. Sousa et al. 2025. A new Ichaosaurus from the lower Jurassic of Portugal (Iberian Peninsula). Acta Palaeontologica Polonica 70(1):179-192; doi:10.4202/app.01199.2024

Source: www.sci.news