PALEOENVIRONMENTAL SIGNIFICANCE OF QUATERNARY MARINE OSTRACODA IN THE CHANGJIANG (YANGTZE)RIVER DELTA
长江三角洲第四纪海相介形虫的古环境意义

Based on the study of Quaternary marine Ostracoda collected from seven drilling holes in the Changjiang (Yangtze) River Dekta, the distribution of these fossils in time and space and the paleoenvilonmental significance have been discussed in this paper. The distribution of these ostracods was controlled by the transgressional layers. They were majorly found in the beds formed at 0.30Ma B. P. and rarely in the beds of the early-middle Quaternary. This situation is identical with the elevation of the sea-level in the coastal plain of eastern China, i. e. the highest sea-level only appeared at about 0.30Ma B. P. The elements of the ostracod fauna are more than that from the western coast of the Bohai Sea, it may be due to the position of this area where was nearer to the open sea and more easilly influenced by it. But this fauna is more simple than those of Fujian, Guangdong and Hong Kong, it reflects the differences of climates and water-temperature.