第四纪期间,特别是晚更新世以来,在黄渤海岸线发生过巨大的变化。关于华北平原海岸变化的研究,可以追溯到我国北宋时代,当时的科学家沈括根据太行山上有螺蚌壳,断定华北平原曾经是海洋。后来,瑞典人克雷陀普认为海进曾达华北平原的四米等高线位置,这条线大致在津浦线以东。也有人曾提出华北平原西至太行,北抵燕山,在第四纪期间都曾是 During the Quaternary period, especially since the late Pleistocene, tremendous changes took place along the Huang-Bo coastline. The study of the changes in the coast of the North China Plain can be traced back to the Northern Song Dynasty in China. At that time, scientist Shen Kuo believed that the North China Plain was once the ocean according to the existence of the snail shells on the Taihang Mountains. Later, the Swedish Crettenopus believed that Haijin reached a four-meter contour on the North China Plain, roughly east of Jinpu Line. Some people have also proposed to the west of the North China Plain Taihang, North arrived in Yanshan, during the Quaternary have been