摘要
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。
Quarrying across a potential GSSP of the Cambrian Stage 5/Series 3 boundary indicates a significant change in trilobite and inarticulate brachiopod faunas. The quarry spans approximately 4.5 m across the potential boundary,which is the FAD of Oryctocephalus indicus in the Wuliu-Zengjiayan section. Detailed collections show that the faunas of the Ovatoryctocara granulata-Baythyonotus holopygus and the O. indicus zones changed in a 20 cm,relatively barren interval. This faunal turnover does not coincide with a lithologic change and suggests that the section would be a good location for the GSSP of the Cambrian Stage 5/Series 3.
出处
《地层学杂志》
CSCD
北大核心
2010年第3期289-292,共4页
Journal of Stratigraphy
基金
the National Natural Science Foundations of China(No.40672018)
the Ministry of Technology and Science of China(2006C13806401)
Chinese National Committee on Stratigraphy Special Science and Technology Foundation of Guizhou.(Gui.Sci.Ji2007-4004)
International cooperation Project of Guizhou Science and Technology(G.[2008]700110)
国家自然科学基金(No.40672008)
科技部科技基础工作专项(2006FY120300-4)资助
