在位于吕梁山西部山前山西柳林卫家洼红粘土层下部发现了一套特殊的水成砂砾层,组成该砂砾石层的碎屑主要是红粘土团块及钙质结核。沉积学的研究表明红粘土和钙质结核碎屑具有不同程度分选性和磨圆度,作为碎屑的钙质结核不再具有不规则的“生姜”状外形而呈典型的圆状或次圆状,这是经过搬运碎屑的典型特征。垂向上自下向上变细的沉积序列,部分层位中埋藏有动物化石都是典型水成堆积物的特征。磁性地层学研究表明其形成于8M a前。这种特殊水成堆积物的发现可为红粘土的成因解释提供新资料。 A special aqua gravel layer was found in the lower part of the red clay layer of Liugong Weijiawa, Shanxi Province, west of Lvliang Mountain, Shanxi. The detritus of the gravel layer is mainly composed of red clay clumps and calcareous nodules. Sedimentology studies have shown that red clay and calcareous nodules have varying degrees of sorting and roundness, and that calcareous nodules that are detritus no longer have an irregular “ginger” -like shape but are typically circular Or sub-circular, which is a typical feature after moving debris. Vertical sedimentary sequence from bottom to top, buried in some layers of animal fossils are typical features of water deposits. Magnetic stratigraphic studies show that it was formed before 8M a. The discovery of this special aquifer deposit provides new information on the genesis of red clay.