山东新汶煤田太原组小有孔虫动物群及石炭-二叠系界线的探讨

通过对山东新汶煤田太原组小有孔虫动物群的系统研究，共鉴定出小有孔虫化石24属66种，根据小有孔虫在太原组中的垂向分布和含量的变化，自下而上分为3个小有孔虫组合：1．Brad yina samarica- Palaeotextularia angusta elongata组合，2．Nodosaria sinensis- Tetrataxis组合，3．Geinitzina postacarbonica组合。通过与邻区及华北部分地区的对比，本区太原组小有孔虫动物群的地质时代应归属于早二叠世，其层位大致相当于华北各地太原组(ting)类的Pseudoschwagerina带。

THE FORAMINIFERAL FAUNA AND THE CARBONIFEROUS - PERMIAN BOUNDARY IN THE TAIYUAN FORMATION OF THE XINWEN COALFIELD, SHANDONG

This study shows that the small foraminiferal fauna in the Taiyuan Formation of the Xinwen coalfield in Shandong Province, contains 66 species in 24 genera of foraminifera. According to the distribution and vertical varia- tion of foraminifera fossils in the strata , the foraminiferal sequence can be divided in ascending order into 3 assemblages: 1. Bradyina samarica-Palaeotextularia angusta elongata Assemblage, 2.Nodosaria sinensis-Tetrataxis Assemblage, 3.Geinitzina postacarbonica Assemblage. Compared with those in nearby regions and some other areas in North China, the geological age of foraminiferal fauna in the Taiyuan Formation of the Xinwen coalfield should be Early Permian. So the boundary of the Carboniferous and the Permian lies at the bottom of the first foraminifera assemblage in the Xinwen coalfield.