自本世纪二十年代以来,中外的地质和古生物学者曾对桑干河谷两岸出露的所谓“泥河湾层”进行过不少工作。1954年我国地质界正式提出把“泥河湾层”划归早更新世,从此“泥河湾层”就成为我国华北地区这一时期的标准地层。近年来,随着第四纪地质研究工作的不断深入,对“泥河湾层”的形成时代和归属问题 Since the 1920s, Chinese and foreign geologists and paleontologists have done a lot of work on the so-called “Nihewan” layer exposed on both banks of the Sanggan valley. In 1954, the geologic community of China formally put forward that “the river of Nihewan” should be placed in the early Pleistocene, and “river of Nihewan” became the standard strata of this period in North China. In recent years, with the deepening of Quaternary geological research work, the forming age and ownership of “the riverine layer”