New Radiolarian Genera and Species of Heituao Formation (Ordovician) in the Kuruktag Region, Xinjiang

详细信息   

• 责任者：Wang Yujing (Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China) ; Cheng Junfeng
• 刊名：Acta Palaeontologica Sinica
• 出版年：2008
• 卷期：47(4)
• 关键词：放射虫类 ; radiolarians ; 新疆 ; Xinjiang
• 页码：p.393-404
• 图表：2 illus.， 2 plates, 26 refs.
• 分类号：1103
• issnNo：ISSN0001-6616
• isbnNo：CN32-1188/Q

摘要

A rich radiolarian fauna is discovered in the chert of the Middle Ordovician Heituao Formation in Kuruktag region, Xinjiang. The fauna is characterized by abundant spherical spumellarians, members of Family Inaniguttidae either with or without outer spines, and some particular groups of uncertain affinities. Ten new species are described. Associated with the fauna includes graptolites of the Exigraptus clavus Biozone, which were found from the black shale of this formation, indicating Dapingian age (Middle Ordovician). Based on the radiolarian fauna, Tetrasphaera kuruktagensis Biozone is identified, which includes two subzones, a lower Protosegmentum xinjiangensis Subzone and an upper Quasibeothuka fusiforma Subzone. This formation may be considered as a potential hydrocarbon source rock.