摘要
二叠纪时,在广西境内有利的古地理环境条件下,使“开阔海”、“局限海”两套生态类型菊石得以繁衍发育。本文回顾了广西二叠纪菊石的发现、研究历程,总结其研究成果,为今后研究奠定了基础。指出:广西是二叠纪菊石生态分异缘起、机制和建立台地、盆地两套菊石序列进行对比的理想地区之一。“局限海”生态类型菊名因受环境制约,与晚二叠世硅泥质、凝灰质岩建造的专属性关系:而开阔海生态类型菊石的发现,可与国际上经典地区进行对比。
In Permian period, the favourable conditions of paleogeographical environment within the boundaries of Guangxi made two sets of ecotypic ammonoids living in the 'open sea' and 'restricted sea'multiply and develop. This paper reviews the discovery of the Permian ammonoids in Guangxi and the course of the studies, sums up its research results, and lays foundations for future study. This paper also points out that Guangxi is one of the ideal areas of the cause and machanism of ecocline of the Permian ammonoids, and the comparison between two sets of ammonoid sequences in the platform and the basin. Restricted by the environment, ammonoids in restricted sea had relations of specialization with the formation of the Late Permian siliceous mudstones and tuffs whearas the ecotype ammonoids in open sea can be compared with those in typical areas in the world.
