四川龙门山中段地区泥盆纪的双壳类化石

The Devonian bivalves from the central part of the Longmen mountain area,Sichuan

四川龙门山中段泥盆纪的双壳类，因腕足类的繁盛排斥而相对贫乏，研究者较少。刘协章（１９８８）描述了江油甘溪、北川一带的泥盆纪双壳类１８属４９种，大部分为新属种，并划分出３个组合带１个顶峰带。笔者在进行１∶５万都江堰幅区调工作时，于都江堰市虹口乡九甸坪深...

Abstract Abundant bivalve fossils Ptychopteria(Actinopteria) were recognized by the authors for the first time in the Ganxi Formation in the Hongkou Village and the lower part of the Guanwushan Formation in the Jinfeng Village,Dujiangyanshi,as well as in the lower part of the Ganxi Formation in Pingyipu,Pingwu,Sichuan.These fossils are classified as six genus and fifteen species. The present paper deals with the distribution and features of these bivalve fossils, and give a more detailed description of five new species ,i.e.? Phthonia sichuanensis, Glossites (G.)longes,Ptychopteria(Actinopteria)pingwunensis,P.(A.) pingyipunensis and Tanaodon gigas. The results in this study have, beyond doubt,improved our knowledge of biostratigraphy in the study area,and also provided reliable provements for the stratigraphic division and correlation.