桂东、桂东南晚泥盆世一个弗拉斯期放射虫动物群

UPPER DEVONIAN (FRASNIAN) RADIOLARIAN FAUNA FROM THE LIUKIANG FORMATION,EASTERN AND SOUTHEASTERN GUANGXI

本文系统描述了广西玉林、贺县等地晚泥盆世榴江组硅质岩中的放射虫化石4属14种,其中有1新属2新种。这个放射虫动物群的多数分子曾见于苏联南乌拉尔地区和澳大利亚的弗拉斯阶。

The siliceous rocks of the Upper Devonian Liukiang Formation are widely distributedin eastern and southeastern Guangxi. Abundant fossil radiolarians and tentaculitids arefound in these rocks, with 4 genera and 14 species including 1 new genus and 2 new speciesof the radiolarians described in this paper. The tentaculitid faunas are dominated by the genera Homoctenus, Costulatostyliolinaand Styliolina, with Styliolina philippovae and S. domanicensis regarded as important mem-bers of the Upper Devonian Frasnian Stage in the Russian Platform and Germany. Theradiolarian faunas are characterized by a great number of species and individuals of the ge-nus Entactinosphaera such as Entactinosphaera assidera, E. egindyensis. E. aitpaiensis, E.vetusta, together with Entactinta dissora and Palaeoscenidium cladophorum. which were al-ready discovered in the Frasnian Egindinsk Formation of the South Urals (Nazarov, 1975)and Australia (Hinde, 1899; Nazarov et al., 1982; Nazarov & Ormiston, 1983), indicatingthat the age of the Liukiang Formation is Late Devonian (Frasnian).