Latest research: Two great environmental changes affect ancient humans in Hemudu

Chinanews.
com, Beijing, November 17 (Reporter Sun Zifa) Since the Holocene (10,000 years ago), the world has rapidly warmed up and sea levels have risen.
The landforms of the coastal areas in eastern China have also changed.
What is the impact of ancient human production and life represented by the Hemudu culture on the Shaoxing (Xing) Plain?

The latest research papers published by Chinese scholars in the international professional academic journal "Palaeogeography, Paleoclimate, and Paleoecology" show that the regional comparison of long-term changes in the paleomagnetic field and paleo-intensity changes can provide high-resolution dating scales for Holocene sediments , To reduce the carbon fourteen dating error
.

The first author of the paper, China Ke Xueyuan Vertebrate Paleontology and Paleoanthropology, said Dr.
Zheng Yan, Holocene temperatures rise, a substantial increase in rainfall, making the terrestrial vegetation growth, ecological environment has become good, suitable for the growth of crops and the development of agriculture This not only laid the foundation for the prosperity and development of ancient humans in coastal areas, but also allowed sea level changes to control the temporal and spatial distribution of Neolithic culture in the eastern coastal plain
.

The Hemudu culture on the Ningshao Plain first appeared in railing-style buildings, lacquerware and other products, which was a stage in the development of ancient human civilization in the early Neolithic period
.

She pointed out that although dating materials such as peat, plant debris/seeds, and shells in the borehole number HMD13 in the Hemudu site area, it can be determined that about 18 meters of gray-black muddy sediments were deposited between about 9,000 and 6,000 years ago.
However, the very different carbon fourteen dating can not determine the chronological sequence of the strata, and a reliable age frame is an important basis for studying the co-evolution and development of ancient humans and the environment
.

Therefore, in this study, the researchers used the long-term paleomagnetic long-term changes and relative paleo-intensity of the Hemudu site to make regional stratigraphic comparisons, and established the age-depth curve of the HMD13 hole, which corrected the carbon fourteen dating well and reduced Dating errors of different dating materials
.

Zheng Yan said that on the basis of reliable chronology, researchers through the results of sedimentation rate, grain size change, and element analysis found that environmental changes and paleoclimatic evolution in the early Holocene had two specific effects on ancient human activities in the Neolithic period:

First, since 7,500 years ago, the sedimentary environment was stable, the land grew, and the coastline slowly receded.
The ancestors began to settle in the Hemudu area 7,000 years ago.
The early cultural strata contained wooden buildings and railing buildings (important in modern coastal areas and river and lake basins).
The foundation of the architectural form) also shows that the early human civilization in the Hemudu area was still affected by the ocean
.

Second, before and after the extreme cold weather event 6300 years ago, the sedimentary environment in the Hemudu area has undergone tremendous changes.
After that, marine-derived materials have almost disappeared, the coastline moved eastward and evacuated Yuyao, and wild rice was quickly domesticated in the freshwater environment
.