下扬子区孤峰组放射虫化石带划分及环境分析

下扬子区中二叠统孤峰组线硅质岩中的放射虫化石极其丰富，这些化石主要阿尔拜虫类（ａｌｂａｉｌｌｅｌｌｉｄｓ）球形多囊虫类（Ｓｐｈｅｒｉｃａｌｐｏｌｙｃｙｓｔｉｎｅ）十字多囊虫类（ｓｔａｕｒａｘｏｎｐｏｌｙｃｙｓｔｉｎｅ）组成，其中以Ｐｓｅｕｄｏａｌｂａｉｌｌｅｌｌａｃａｌｐｒａｔａ．Ｐ．ｌｏｎｇｔａｎｅｎｓｉ，Ｐ．ｃｆ．ｌｏｎｇｉｃｏｒｎｉｓ，ＨｅｇｌｅｒｉａＭａｍｍｉｌｌａ，Ｆｏｌｌｉｃｕｃｕｌｌ

Classification of Radiolarian Fossil Zones and Environmental Analysis of Gufeng Formation in Lower Yangtze Region

Abundant radiolarians have been recently found in the chert of Gufeng Formation of Middle Permian in Lower yangtze region. These radiolarian are composed of the albaillellids, the spherical polycystine and the stauraxon polycystine, among which dominant elements are P seduoa lbaillella scalprta,P. Longtanensis, P .cf. Longicornis, Hegleria mammilla, Follicucullus monacanthus and Ruzhencevispongus uralicus. The paper discuses three zones and their characters,established by the former geologists in Gufeng Formation of Lower Yangtze region. Through the correlation with some international respective zones,the paper points out the radiolarians lived in the circumstance of slope or deep sea and explains their formation mechanism of the circumstance.