湖南郴县—嘉禾地区晚二叠世腕足动物组合特征

The Assemblage Characters of the Upper Permian Brachiopod in Chen County-Jiahe Area, Southern Hunan Province

本文对湘南郴县——嘉禾地区晚二叠世的腕足动物群进行了详细研究。依据其性质、分布范围等,首次建立了本地区晚二叠世腕足动物组合层序,自下而上为:龙潭阶:Tyloplecta yangtzeensis-Asioproductus bellus组合;长兴阶下部:Peltichia sinensis-Acosarina dorsisulcata组合;长兴阶上部:Perigeyerellafastigata-Semibrachthyris anshunensis组合;并将它们与国内外同期的腕足动物群或组合进行了对比。本区晚二叠世腕足动物十分丰富,尤其是长兴期的腕足动物群,是世界上古生代层位最高,化石内容最为丰富的动物群之一。

This paper deals with the Upper Permian brachiopod faunas in Chen County and Jiahe County, South Hunan Province. According to their characters and distributions in the ranges of geography and geology, three assemblage zones in the Upper Permian in this area are firstly estabilished. They are listed in descending order as follows: Changxing Stage 3)Perigeyerella fastigata-Semibrachythyris anshunensis Assemblage Zone 2) Peltichia sinensis-Acosarina dorsisulcata Assemblage Zone Lungtan Stage 1) Tyloplecta yangtzeensis-Asioproductus bellus Assemblage Zone The correlation of Upper Permian brachiopod faunas and or assemblage zones in this region to those in other regions at home and abroad shows that they are very abundant in this area and particularly, the Changxingian brachiopod fauna is one of the most abundant brachiopod faunas found in the world.