Study On The Tanshishan Site And Its Natural Environment Evolution

Tanshishan Site is one of main Neolithic sites in Fujian. The paper chose Tanshishan Site as the study area. By means of grain size and magnetic susceptibility, natural environment evolution in Tanshishan Site was discussed. The main conclusions were drawn as following:First, based on the analyses of grain size, field survey, frequency curves, probability cumulative curves and Sahu's formula, the paper came to realize that the study area was estuarine environment, which was influenced by the river and the tide together.Second, based on the analyses of magnetic susceptibility, comparisons of magnetic susceptibility with frequency-dependent magnetic susceptibility and grain size were carried out to discover that ferrimagnetic content controlled the magnetic susceptibility of samples. Furthermore, the main causes of high magnetic susceptibility were geology, climate, plants and organic matter. The formation of groundwater soil may be one of factors which caused low magnetic susceptibility of samples in the shells layer. And human beings'activities, such as firing, did not influent magnetic susceptibility of samples obviously.Third, in the light of classification of faunal remains from Tanshishan Site, the paper came to reveal that the vegetation in the study area was covered well. At the same time, estuarine environment in the study area was further confirmed by clams'habitat.Finally, low-frequency magnetic susceptibility and mean grain size were used as environmental indicators. Archeological materials were used to set up profiles' strata and dates. All of these showed that the study area had been experimented from a warm-moist climate to a cold-dry climate to warm climate. Tanshishan Culture had been developed in the warm climate, but it was limited by the cold-dry climate which changed the local human being the way of pursuing food.