湖北南部晚二叠世的(竹蜓)类

THE LATE-PERMIAN FUSULINIDS IN SOUTH HUBEI

  • 摘要: 鄂南蒲圻、通山、崇阳等地晚二叠世地层发育,含(竹蜓)类化石9个属40个种,其中新种8个,未定种7个,根据它们的地层分布位置,可分两个带、两个亚带,即吴家坪阶Codonofusiella带,长兴阶Palaeofusulina带;后者,下部为Palaeofusulina-Reichelina亚带,上部为Nankinella-Staffella亚带。CodonofusiellaPalaeofusulina混生现象只限于长兴组下部。代表区内长兴阶最高层位不是palaeofusulina,而是新建立的Nankinella-Staffella组合化石亚带。笔者认为,我国南部各地域内都以Palaeofusulina来确定二叠系和三叠系的界线是困难的。

     

    Abstract: The late-Permian strata were developed in Puqi,Tongshan,Chongyang and some other areas in the south of Hubei Province, bearing 9 genera with 40 species,of which there were 8 new species and 7 undefined species. According to their position in the strata, they can be divided into two zones and two subzones,i. e. Codonofusiella zone in Wujiaping Stage and Palaeofusulina zone in Changxing Stage, the latter is subdivided into Palaeofusulina-Reichelina subzone in the lower and Nankinella-Staffella subzone in the upper of the stage. The mixed assemblage of Codonofusiella and Palaeofusulina a phenomenon only found in the lower of Changxing stage. The fossils which represented the top horizong of Changxing Stage in the region were not Palaeofusulina, but the newly-defined Nankinella-Staffella assemblage. The auther thinks that it would be difficult to take the Palaeofusulina as marker fossils for the boundary between the Permian and Triassic in all south China.

     

/

返回文章
返回