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Based on archaeological excavations,217 samples were collected from the Luotuodun Site. Of them 63 samples from the section plane of the site layer were used for identification analysis of foraminifera,plant debris and seed fossils,and four samples were used for 14C dating and relevant analysis. Through many kinds of experiments,we have drawn some conclusions. Firstly,benthic foraminifera,such as Ammonia compressiuscula and Ammonia cff. sobrina,are found in the 10th layer,indicating that between 7500 and 5400 BC,i.e. before the emergence of the Majiabang Culture,Luotuodun Site and its nearby regions had ever experienced a marine transgression event. Secondly,we have found 450 plant fossils in this site,such as Polygonum sp.,Scripus sp.,Najas sp.,Physalis sp.,which indicated lacustrine or swamp environment.
Based on archaeological excavations, 217 samples were collected from the Luotuodun Site. Of them 63 samples from the section plane of the site layer were used for identification analysis of foraminifera, plant debris and seed fossils, and four samples were used for 14C dating and relevant analysis. Through many kinds of experiments, we have drawn some conclusions. First, benthic foraminifera, such as Ammonia compressiuscula and Ammonia cff. sobrina, are found in the 10th layer, indicating that between 7500 and 5400 BC, ie before the emergence of the Secondary, we have found 450 plant fossils in this site, such as Polygonum sp., Scripus sp., Najas sp., Physalis sp., Which shows lacustrine or swamp environment.