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贵州铜仁地区石竹—牙溪一带的熬溪组自下而上分为3个岩性段,第Ⅰ段主要由泥质白云岩和细晶白云岩组成,上部产较多的三叶虫,计6属(2亚属),3种、2未定种及1新种,分别为Probowmania (Mufushania) nankingensis、Probowmania (Pr.) balangensis、Balangcunaspis(B.)transversus、Oryctocephalops sp.、Kooteniasp.和Deiradonyx tongrenensis sp.nov.。其中Deiradonyx见于澳大利亚北部Templetonian下部的Alexandris层,Oryctocephalops主要产于西伯利亚Amginian下部,两者时代均为早寒武世;Kootenia主要见于下寒武统;其他三叶虫均为凯里组下部常见的分子。上述三叶虫的发现改变了熬溪组为中寒武统的认识,熬溪组是跨中、下寒武统的岩石地层单元。熬溪组第Ⅰ段上部层位为下寒武统顶部,与紧邻的第Ⅱ段下部的含钾页岩共同组成凯里组。
The Aoxi Formation in Dianzhu - Yaxi, Tongren, Guizhou is divided into three lithology segments from bottom to top. The first segment mainly consists of argillaceous dolomite and fine crystalline dolomite, and the upper part produces more trilobites. 6 genera (2 subgenus), 3 species, 2 undetermined species and 1 new species were identified as Probowmania (Mufushania) nankingensis, Probowmania (Pr.) Balangensis, Balangcunaspis (B.) transversus, Oryctocephalops sp., Kooteniasp. And Deiradonyx tongrenensis sp.nov .. Among them, Deiradonyx is found in the Alexandris layer in the lower part of Templetonian in northern Australia. Oryctocephalops are mainly found in the lower part of Amginian in Siberia, both of which are Early Cambrian. Kootenia is mainly found in the Lower Cambrian. Other trilobites are common molecules in the lower part of Carey Formation . The discovery of the trilobite changed the understanding of the Aoxi Formation to the Middle Cambrian, and the Aoxi Formation is a lithospheric unit that straddles the Middle and Lower Cambrian. The upper layer of the first section of Aoxi Formation is the top of the Lower Cambrian, and forms the Kaili Formation together with the lower potassium shale in the second section of the immediate vicinity.