【摘要】 <正> 一前言自中国南方的长兴阶被国际上承认为二叠纪最年轻的沉积以来,其上是否出露有三叠系的底,一直是国内外二叠系一三叠系界线工作者关注的一个问题。以Otoceras woodwardi带的底作为三叠系的底,是目前广为接受的传统意见。在中国南部和西部,除喜马拉雅地段见及真正的Otoceras外,仅许德佑描述过产自江苏南京附近龙潭的Otoceras cf.woodwardi Griesbach (Hsu,1936—更多还原

【Abstract】 Since the Changhsingian was accepted as the youngest Permian, there has been a question whether the earliest marine Triassic strata exist in South China.The base of Otoceras woodwardi zone is traditionally accepted as the Permo-Triassic boundary by most geologists. But, in China, not to mention its occurrence in S. Xizang (Tibet), only two specimens of Otoceras cf. woodwardi更多还原