山东肥城煤田本溪组—太原组牙形刺

Conodonts from the Taiyuan Formation and Benxi Formation in the Feicheng Coalfield, Shandong

通过对山东肥城煤田本溪组和太原组牙形刺动物群的系统研究,共鉴定出牙形刺化石6属14种及部分未定种,根据牙形刺化石在地层中的分布和垂向变化规律自上而下建立了两个牙形刺组合:.Streptognathodus barskovi组合和.Streptognathodus parvus—Idiognothodus magnificus组合。通过与邻区及华北部分地区对比,本区本溪组和太原组中牙形刺动物群的地质时代应分别为晚石炭世晚期(组合1)和早二叠世早期(组合),本区C—P界线应在四灰之底。

6 genera 14 species of conodonts have been found from the Taiyuan Formation and Benxi Formation in the Feicheng Coalfield ,Shandong Province. Based on the geographical distribution and vertical variation of conodont fossils in the strata, the conodonts may be distinguished into 2 assemblages as following（in descending order）. Ⅱ. Streptognathodus barskovi and I. Streptognathodus parous-Idiognothodus magnificus assemblage. Compared with those in nearby regions and some other areas in North China ,the geological ages of the fauna in the Feicheng Coalfield should be early Early Permian （assemblage Ⅱ ）and late Late Carboniferous（assemblage I ）respectively,and the Carboniferous-Permian boundary in the Feicheng Coalfield shoulf be at the bottom of No. 4 limestone.