广西六景泥盆纪吉维阶-弗拉斯阶界线层牙形石生物地层Conodont Biostratigraphy across the Givetian-Frasnian Boundary (Devonian) of Liujing,Guangxi
江大勇,丁干,白顺良
摘要(Abstract)：
广西六景泥盆系剖面是我国泥盆系标准剖面之一 ,通过对其吉维阶 -弗拉斯阶界线上下地层进行详细的牙形石生物地层研究 ,自上而下识别出 12个牙形石带 :Palmatolepis jamieae带、Palmatolepis hassi带、Palmatolepispunctata带、Palmatolepistransitans带、上 Mesotaxisfalsiovalis带、下 Mesotaxisfalsiovalis带、Klapperina dispar-ilis带、上 Schmidtognathus hermanni- Polygnathus cristatus带、下 Schmidtognathus hermanni- Polygnathus cristatus带、上 Polygnathus varcus带、中 Polygnathus varcus带、下 Polygnathus varcus带。吉维阶 -弗拉斯阶界线 (即中 -上泥盆统界线 )由 Ancyrodella binodosa→ Ancyrodella rotundiloba early form→ Ancyrodella rotundiloba late form这一演化线系中的 Ancyrodella rotundiloba early form的首次出现确定 ,处于下 Mesotaxis falsiovalis带下部 ,在谷闭组底界之上 1.80 m处。
关键词(KeyWords)： 牙形石;生物地层;吉维阶-弗拉斯阶界线;泥盆纪;广西
基金项目(Foundation):
作者(Author): 江大勇,丁干,白顺良
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