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经国际莫斯科阶-卡西莫夫阶界线工作组2008年的投票表决,目前全球卡西莫夫阶的底界比传统底界提高了一个多亚阶;牙形刺Idiognathodus sagittalis和Idiognathodus turbatus是两个候选的底界标志种。牙形刺Id-iognathodus swadei-Ⅰ.turbatus演化谱系在华南连续的深水海相碳酸盐沉积剖面---贵州罗甸纳庆剖面的发现表明,Idiognathodus turbatus的首现是全球卡西莫夫阶底界的潜在标志;纳庆剖面作为目前最具潜力的候选层型剖面,值得进一步深入研究。
According to the vote of the International Moscow-Kasimov Boundary Working Group in 2008, the bottom boundary of the global Kasimovian step is now more than a multi-order higher than the traditional bottom boundary. The conodonts Idiognathodus sagittalis and Idiognathodus turbatus are two A candidate for the bottom of the sign type. Id-iognathodus swadei-Ⅰ.turbatus Evolutionary lineage Continuous deep-water marine carbonate sedimentary profiles in southern China --- Discovery of the Luodiannaqing profile in Guizhou shows that the first occurrence of the Idiognathodus turbatus is the global Kasimovian The potential landmark of the bottom boundary; Naqing section as the most potential candidate layer profile, it is worth further study.