银川盆地第四纪地层学研究

Quarternary Stratigraphy in Yinchuan Basin

依据盆地内７个钻孔的岩石地层、磁性地层及孢粉地层等资料，探讨了区域沉积旋回特征、盆地沉降的阶段性及植被、气候的变迁过程，查明布容正极性时中存在蒙戈、拉尚、布莱克及安比拉亚时。据此，建立了井下地层单元：上更新统惠农组及全新统西大滩组，并对下更新统银川组、中更新统贺兰组做了补充、修订。

Based on the data about lithostratigraphy, biostratigraphy and magnetic stratigraphy from 7 drill cores in Yinchuan Basin, this paper mainly deals with the characters of sedimentary cycles, the stages of the basin subsidence and the changes of vegetation and climate in the region. The results indicate that there existed some significant events such as Mungo, Lascheemp, Blake and Emperor substage during the Brunhes chron. Moreover, the stratigraphic units were established as follows: the Huinong Formation of late Pleistocene age and the Xidatan Formation of Holocene age. Besides, the Yinchunan Formation of early Pleistocene age and Helan Formation of middle Pleistocene age are supplemented and revised in this paper.