Study of the archaeological sediment plays an important role in the human earth relationship study Huang Xixuan et al (1984) madea study on the
environmental changes since the Neolithic cultural periods in the Hai'an region by
Pollen Analysis', 1, 1604883)"; href="/tags/pollen-analysis/">pollen analysis However, single proxy indicator analysis makes the research result, to some degree, uncertain As such, the authors employ the sedimentary dynamics, environmental magnetism, microorganism and chronology, etc., interdisciplinary methodology and multiproxy indicators to study the coupled relationship between human activities and environmental changes during the Neolithic cultural period in the study region Magnetic susceptibility, grain size, pollen and 14 C dating analysis results indicate that there occurred a degression process from
layer 8 to layer 7 microorganism analysis suggests that the study region is relatively far away from the ocean Pollen analysis result indicates the existence of halophyte Chenopodiaceae, suggesting the soil contains high content of salt, which indicate frequent transgression occurrence to this study region The climate grows warmer and more humid from layer 8 to layer 7,
suitable climatic environment provides good living conditions for human settlement in this study region 14 C dating analysis shows that the layer 6 is 3790±105 14 C aB.P., being in a sub stable climate warm and wet climatic periods with little fluctuations in climatic changes Suitable climatic environment offer good conditions for great progress in human civilization There occurred a great flood period in the layers 3, 4, 5 of the site, about 4000 14 C aB.P. from analysis of grain size and micro fabric of the layers, which leads to the collapse of the human civilization in this region
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