苏皖地区孤峰组放射虫动物群及其古环境意义

苏皖地区下二叠统孤峰组４条剖面中含有极其丰富的放射虫化石，经鉴定计９属２７种，它们主要由阿尔拜虫类ａｌｂｉｌｌｅｌｌｉｄｓ，球形多囊虫类ｓｐｈｅｒｉｃａｌ ｐｏｌｙｃｙｓｔｉｎｅ和十字多囊虫类ｓｔａｕｒａｘｏｎ ｐｏｌｙｃｙｓｔｉｎｅ组成，并且可以划分成３个组合带，即Ｐｓｅｕｄｏａｌｂａｉｌｌｅｌｌａ ｆｕｓｉｆｏｒｍｉｓ－Ｐ．ｌｏｎｇｔａｎｅｎｓｉｓ，Ｆｏｌｌｉｃｕｃｕｌｌｕｓ ｍｏｎａｃａｎｔ

Studies on Radiolarian Fauna from Gufeng Formation in Anhui and Jiangsu Provinces,East China and Its Paleoenviromental Significance

Recently, diverse, abundant and well-preserved radiolarians have been discovered from the radiolarites of the four sections of the Gufeng formation(Lower Permian) in Anhui and Jiangsu Provinces, among which nine genera and twenty seven species are recognized. These radiolarians are composed of three basic types of microfossils, namely, the albaillellids, the spherical polycystine and the stauraxon polycystine- Based on the distribution pattern of the radiolarians in the Gufeng Formation, they are divided into three assemblage zones, namely, the Pseudoalbaillella fusoformis - P. longtanesis Assemblage Zone in the lower part, the Follicucullus monacanthus Assemblage Zone in the middle part and the RuzhencevisPongus uralicus-Follicucullus scholasticus Assemblage Zone in the uper part. At the same time, according to the appearance of the three assemblage zones, the four sections of the Gufeng Formation are correlated by them, and they are still correlated with the assemblage zones of the same age from Guangxi and Yunnan of China, Southern Japan and North America. Finally, the ages of the three assemblage zones are discussed, corresponding to Maokouan and Guadalupian stage. In addition, judging from the features of radiolarites, faunal assemblages, geochemistry and paleomagnetic material, the radiolarites in the area might be formed by the effect of the upwelling.