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一、天津市浅层土的生成及其工程特性的影响 1.四万年前开始晚更新世后期的海进。距今已2.5～3.5万年,即大理冰期的后期,随气温降低,出现一次规模较大的海退。它使我同东部海岸线向外延伸600公里以上,约-150米(大沽海平,下同)以上的海底暴露成陆;渤海、东海、黄海大陆架大部分成为陆地。渤海东庙岛列岛上有华北平原晚更新世后期的黄色土层,并在其中发现陆生脊椎动物化石,充分说明当时它与大陆相连。
First, the formation of shallow soil in Tianjin and the impact of its engineering characteristics 1. 40,000 years ago, the late Pleistocene Haijin began. 2.5 to 3.5 million years ago, that is, the late Dali ice period, with the temperature decreased, there is a larger retreat. It made me extend to the sea beyond the coastline of more than 600 km and about -150 m (Taku sea level, the same below) with the eastern coastline; most of the continental shelf in the Bohai Sea, the East China Sea and the Yellow Sea became land. There is a yellow soil layer in the late Pleistocene of the North China Plain on the island of Dongmiao Island in the Bohai Sea, in which terrestrial vertebrate fossils are found, which fully shows that it was connected to the mainland at that time.