根据微体古生物分析结果并综合其他资料,证明上海地区东部第四纪以来经历过四次海进:晚更新世中期和全新世的海进较强,形成浅海相沉积;中更新世与晚更新世早期的海进较弱,仅有海陆过渡相沉积。 Based on the results of the paleontological analysis and other data, it is proved that there have been four sea changes since the Quaternary in the eastern part of Shanghai. The sea facies in the mid-late Pleistocene and the Holocene are strong, forming shallow marine sediments. The mid-Pleistocene and late- In the early period of the world, the sea was weaker and only the sedimentary facies of the sea-land transitional phase was deposited.