At Yangtze Delta, about 160 miles[160kmsouthwestofShanghaiLiangzuCity’sarchaeologicalruinsarelocatedThereamoreadvancedculturebloomingabout5300yearsagothanksfortheengineeringofmanyhydraulicstructures
The fortified city has a complicated system of navigational canals, dam and water reservoir. This system makes it possible to cultivate many areas of agriculture throughout the year. In the history of human civilization, it is one of the first examples of developed communities based on a water infrastructure.
And they do it all without metal.
Long undiscovered, the archaeological site is now considered a well-preserved record of Chinese civilization dating back more than 5000 years and was declared a UNESCO World Heritage site in 2019. However, the advanced civilization of this city came to an abrupt end.
“A thin layer of clay is found in the preserved ruins, which focuses on a possible connection between the death of the Yangtze river from the east China river.
The Tripstones of the Shennong Cave (pictured) and Jiulong Cave gave an accurate view during the collapse of Liangzu culture about 4300 years ago. Credit: Haiwei Zhang
Store store the answer
The caves and their deposits, such as leaking, one of the most important climate archives that exist. They allow to rebuild climate conditions above holes until some 100,000 years to the past. Because it is not clear what causes the sudden collapse of Liangzu culture, looking for research team for a possible climate.
Geologist Haiwei Zhang from Xi’an Jiaatong University in Xi’an got samples of staetses from two caves Shennong and Jiulong, located southwest on the site of excavation.
Data from stalagmites appeared between 4345 and 4324 years ago there was a high rainfall. The evidence for this is given to the carbon’s isotope records, measured at the University of Innsbruck. Proper dating is made by analyzing uranium-thorium in Xi’an Jaatong University, whose measure of accuracy ± 30 years.
The widespread rainfall is likely to bring severe flooding in Yangtze and its branches that even sophisticated dams and canals can no longer avoid water masses and force people to flee. The more soft climate situations continue to withdraw another 300 years, as shown geologists from cave data.
Citide: Haiwei Zhang, Hai Cheng, Ashish Sinha, Christoph Spötl, Yanjun Cai et al. Liangzhu collapse and other Neolithic cultures in the lower Yangtze region in response to climate change. Sci. Adv.2021 doi: 10.1126 / sciadv.abi9275
