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通过对上海志丹苑遗址剖面地层中盘星藻、双星藻、环纹藻、硅藻、介形虫、有孔虫等微体化石的研究,推测了石闸建造后的古河道水体变化。河道水体早期就受到海水交汇影响,中期从海生硅藻及有孔虫的增多,反映海水上溯能力增强,到后期,剖面上部海生藻类、有孔虫数量减少,反映志丹苑所在河道与海水的连通性逐渐降低。
Through the study on the microflora in the section of Zhidanyuan Site in Shanghai, such as Panax Species, Binary Algae, Cyclobalanopsis, Diatom, Ostracoda, Foraminifera and other fossils, the changes of the waterways in the ancient rivers after the construction of the Stone Gate were estimated. In the middle period, the increase of diatom and foraminifera in the sea caused the increase of upstream ability of seawater. In the later period, the number of marine algae and foraminifera in the upper part of the section decreased, which reflected that the waterway between Zhidanyuan and Seawater connectivity decreases.