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作者在桂北资源县吴家和全州市木皮口的下寒武统清溪组剖面修测过程中，对所采集的岩石样品进行偏光显微镜观察研究，发现清溪组～Ｃ１－１ｑ、～Ｃ１－３ｑ和～Ｃ１－５ｑ中原定名为“粉砂岩”和“变余长石石英砂岩”的岩石中含有大量火山凝灰碎屑（晶屑），继而在桂北龙胜、融水和湘西南城步、武岗、新宁等地同时代的富铀黑色岩系中发现存在着２－３层厚度不等的沉凝灰岩。根据岩石的化学成分、结构特征和利用化学成分分析数据所作的各种变异图，确认这些岩石是火山作用形成的沉凝灰岩，通过成岩后的浅变质作用成为变质沉凝灰岩
In the process of revising the Lower Cambrian Qingxi Formation in Wujiahe, Wuyuan County, Guangxi Province, and analyzing the profile of the Qingxi Formation, the collected rock samples were observed by polarized light microscope. It was found that ~ C1-1q, ~ C1- 3q and ~ C1-5q in the Central Plains named “siltstone” and “feldspathic quartz sandstone” contains a large number of volcanic tuff debris (crystal debris), then in Longsheng in Guangxi, meltwater and Xiangxi Nanchengbu, Wugang, Xinning and other places rich in contemporary uranium black rock found in the presence of 2-3 layers of thick tuff of varying thicknesses. Based on the chemical composition, structural characteristics and various variations of the chemical composition analysis data, it is confirmed that these rocks are volcanic sedimentary tuffs that have become metamorphosed tuffs through diagenesis and metamorphism