苏皖南部孤峰组放射虫动物群

南京天宝山、安徽巢湖平顶山、泾县晏公堂和南陵丫山孤峰组中含有较丰富的放射虫化石，包括７属１６种（未定种），分属于６个科，可以分成三个化石组合带，即下部的Ｐｓｅｕｄｏａｌｂａｉｌｌｅｌｌａｆｕｓｉｆｏｒｍｉｓ－Ｐｓ．ｌｏｎｇｔａｎｅｎｓｉｓ带，中部的Ｆｏｌｌｉｃｕｃｕｌｌｕｓｍｏｎａｃａｎｔｈｕｓ带和上部的Ｒｕｚｈｅｎｃｅｖｉｓｐｏｎｇｕｓｕｒａｌｉｃｕｓ－Ｆｏ．ｓｃｈｏｌａｓｔｉｃｕｓ带。这三个带分别可以同广西钦州地区的Ｐｓ．ｇｌｏｂｏｓａ带，Ｆｏ．ｍｏｎａｃａｎｔｈｕｓ带和Ｆｏ．ｓｃｈｏｌａｓｔｉｃｕｓ－Ｆｏ．ｖｅｎｔｒｉｃｏｓｕｓ带对比。根据孤峰组下伏地层栖霞组灰岩中所含类Ｐａｒａｆｕｓｕｌｉｎａｍｕｌｔｉｓｅｐｔａｔａ带和上覆地层堰桥组或武穴组灰岩中所含类Ｍｅｔａｄｏｌｉｏｌｉｎａ动物群证实，孤峰组与华南地区茅口组下部类Ｎｅｏｓｃｈｗａｇｅｒｉｎａ带大体相当。最近的古地磁和古生物资料证明，在华北板块与扬子板块之间，二叠纪时存在一个宽阔的海洋，孤峰组硅质岩中的这些放射虫动物群就是由这个洋中发育的上升洋流带入扬子板块断陷盆地中沉积的。

RADIOLARIAN FAUNA OF THE KUHFENG FORMATION IN SOUTHERN PART OF JIANGSU AND ANHUI PROVINCES

The relatively rich radiolarians of the Kuhfeng Formation found from Tianbaoshan in Nanjing,and from Pingdingshan of Chaohu,Yangongtang of Jingxian and Yashan of Nanling in Anhui comprise 14 species and 2 unnamed species,belonging to 7 genera,which are grouped in 6 families and may be divided into 3 radiolarian assemblage zones,namely,the Pseudoalbaillella fusiformis-Ps.longtanensis Zone(lower);the Follicucullus,monacanthus Zone(middle) and the Ruzhencevispongus uralicus-Fo.scholasticus Zone(upper).They are equivalent in age to the Ps.globosa Zone,the Fo.monacanthus Zone and the Fo.sholasticus-Fo.ventricosus Zone of Qingzhou,Guangxi respectively.Based on the fusulinid Parafusulina multiseptata and Metadoliolina(=Neomisellina) Zones discovered from the underlying Chihsia Formation and the overlying Yanqiao or Wuxue Formation,the age of the Kuhfeng Formation has been regarded as corresponding to the fusulinid Neoschwagerina Zone of Early Maokouan in South China.Recent palaeomagnetic and palaeontological data have demonstrated that there existed a wide ocean between the North China and Yangtze Plates in the Permian time,and that the radiolarians of the Kuhfeng Formation were brought through the upwelling currents developed in this ocean and were deposited in the fault basin of the Yangtze Plate.