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黑龙江省龙江县朱家坎附近(大兴安岭东坡)的白土山剖面,曾是东北下更新统地层的模式剖面,早在五十年代初就受到地质、地理工作者的重视。1959年全国地层委员会将白土山的第四纪地层命名为白土山组,其时代为早更新世,其底界为第四纪的下限。此后,白土山组被广泛地引用和对比。白土山组地层在松嫩平原和三江平原为第四纪孔隙水主要含水层之一,所以,研究它不仅具有重大的理论意义,而且具有重要的实践意义。
The section of Baisha Mount, near Zhujiakang in Longjiang County, Heilongjiang Province (east slope of Daxinganling Mountains), was once a model section of the Lower Pleistocene strata in northeastern China. As early as the early 1950s, geology and geography workers paid great attention to it. In 1959, the National Stratigraphic Commission named the Quaternary stratigraphy of the Cedar Hills as the Ctushan Formation. Its era was Early Pleistocene and its bottom boundary was the lower limit of Quaternary. Since then, the Cotatum group has been widely cited and contrasted. The Bessashan Formation is one of the major aquifers of Quaternary pore water in the Songnen Plain and the Sanjiang Plain. Therefore, studying it not only has great theoretical significance, but also has important practical significance.