川南甘洛黔北仁怀地区晚奥陶世和早志留世四射珊瑚新资料及其地质意义  

NEW INFORMATION ON LATEST ORDOVICIAN AND EARLY SILURIAN RUGOSE CORALS IN GANLUO,SOUTHERN SICHUAN AND RENHUAI,NORTHERN GUIZHOU AND THEIR GEOLOGICAL SIGNIFICANCE

作　　者：何心一[1] 唐兰[1,2] 陈建强[1] 

机构地区：[1]中国地质大学,北京100083 [2]广西大学,南宁530004

出　　处：《古生物学报》2009年第1期9-22,共14页Acta Palaeontologica Sinica

基　　金：科技部“岩石和化石标本整理整合及共享试点”2007项目资助

摘　　要：报道首次在川南甘洛田坝地区晚奥陶世晚期Hirnantian期观音桥层中发现四射珊瑚Borelasma, Cras-silasma和Streptelasma等属,这一珊瑚群可与黔北毕节、仁怀地区同期的四射珊瑚群对比,进一步表明扬子区晚奥陶世晚期的四射珊瑚与北欧斯堪的纳维亚同期的珊瑚群关系密切。首次报道川南甘洛田坝早志留世的四射珊瑚Brachyelasma, Crassilasma和Entelophyllum3属,这一属群可与上扬子区重庆綦江早志留世石牛栏组或滇东北大关地区早志留世Telychian期早期嘶风崖组四射珊瑚群对比。文中还报道黔北仁怀石场晚奥陶世观音桥层2个四射珊瑚新种,即Brachyelasma concavitabulatum sp. nov.和Crassilasma obliquitabulatum sp. nov.。The latest Ordovician(Hirnantian) rugose corals from the Guanyinqiao Beds in Ganluo district of southern Sichuan are reported for the first time including genera Borelasma,Crassilasma and Streptelasma.This rugosan fauna may correlate with that from the Guanyinqiao Beds in northern Guizhou.The new materials further indicate the close biogeographic affinities of the Late Ordovician rugosan fauna in the Yangtze region to those of Northern Europe and Scandinavia.Three genera Brachyelasma,Crassilasma and Entelophyllum are first reported from the Sifengya Formation(Early Telychian) at Tianba area,Ganluo in southern Sichuan,these generic taxa probably correlate with those rugosan fauna of the Shiniulan Formation(Middle Llandovery) in Qijiang area,Chongqing,or with the fauna of the Sifengya Formation(Early Telychian) in Daguan area,northeastern Yunnan.

关 键 词：四射珊瑚 晚奥陶世 早志留世 川南 黔北 

分 类 号：Q915[天文地球—古生物学与地层学]