长期以来,我国的地学工作者在对第四系研究中,一直采用传统的统一地层单位和四分法的划分原则,分第四系为全新统(Q_4)、上更新统(Q_3)、中更新统(Q_2)和下更新统(Q_1)。在这个原则下,一般人将马兰黄土作为我国北方黄土地区标准的上更新统土状沉积物,萨拉乌苏组被视作黄河中游地区标准的上更新统河湖相沉积物。马兰黄土与萨拉乌苏组二者之间的地层关系,是一个长期争论的问题。德日进等认为是相变关系,并称萨拉乌苏组为砂相 For a long time, geoscientists in our country have always adopted the principle of division of the traditional unit of strata and the four-point method in the study of the Quaternary. The Quaternary is divided into the Holocene (Q_4), the Upper Pleistocene (Q_3), Regeneration (Q_2) and Lower Pleistocene (Q_1). Under this principle, most people regard Malan loess as the upper Pleistocene native sediment in the northern loess area of ​​China and the Sara Wusu Formation is regarded as the upper Pleistocene lacustrine sediments in the middle reaches of the Yellow River. The stratigraphic relationship between the Malan Loess and the Salaussu Formation is a matter of long standing controversy. Germany and Japan believe that the relationship between the phase transition, and that the Sara Wusu sand group