Abstract

THE Gucheng Lake is located in Gaochun County, Jiangsu Province, China (31" 14'36"31°19'28"N, 118"51i34"-1 1g057'56"E). It lies in the southeast monsoon climate area. To study the paleoclimatic and environmental change of the lake area since Late Ice Age and clarify evolution of the southeast monsoon, a core of 20 m (GS1) was drilled at the center of the lake in November, 1992. During the research it was found that high garnmacerane contents occur in the interval of 12.08-5.55 m, and gammacerane indexes are also high in this section. These indicate that salinity of the lake water increased in this stage. Many brackish di

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