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贵州剑河八郎乌溜—曾家崖寒武系第5阶底界潜在的全球层型剖面及点位上下的动物群(三叶虫和无铰纲腕足类)有显著的变化;研究的剖面厚约4.5m,穿过首现点位Oryctocephalus indicus。经逐层化石的采集和深入的研究,证实在寒武系第4阶或寒武系第2统顶部Ovatoryctocara granulata-Bathynotus holopygus带与寒武系第5阶或寒武系第3统底部Oryctocephalus indicus带之间大约有20cm的贫化石间隔区。这一动物群的突变是在均一的岩相中发生的,表明该剖面是建立寒武系第5阶(或第3统)底界的全球层型剖面和点位(GSSP)理想剖面。
There is a significant change in the potential global stratigraphic profiles of the 5th bottom boundary of the Cambrian of the Zengjiacao area and the animal groups above and below the point (trilobites and the non-hinged brachiopods). The thick sections studied 4.5m, crossing the first spot Oryctocephalus indicus. After the fossil layering and in-depth study, it was confirmed that Oryctocephalus indicus (Ovatoryctocara granulata-Bathynotus holopygus belt) in the 4th Cambrian Cambrian or Cambrian top Ovatoryctocara granuti-Bathynotus holopygus zone and the Cambrian fifth order or the bottom of the Cambrian third system Oryctocephalus indicus About 20cm between the fossil pits. The abrupt fauna of this fauna occurred in a homogeneous lithofacies indicating that the profile is the ideal profile of the global stratigraphic and site (GSSP) to establish the 5th (or 3rd) bottom boundary of the Cambrian.