湖南益阳下奥陶统弗洛阶的笔石分带  

BIOZONATION OF FLOIAN (LOWER ORDOVICIAN) GRAPTOLITES FROM YIYANG,HUNAN

作　　者：李丽霞[1] 冯洪真[1] 李明[2] 彭进[1] 季鑫鑫[1] 王文卉[1] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]中国地质科学院地质研究所,北京100037

出　　处：《地层学杂志》2009年第2期123-137,共15页Journal of Stratigraphy

基　　金：国家自然科学基金(No.40472014)资助项目

摘　　要：根据对采自湖南益阳南坝剖面的笔石化石的研究,识别出了下奥陶统弗洛阶4个连续的笔石带(自下而上):Tetragraptus approximatus带、Pendeograptus fruticosus带、Didymograptellus bifidus带和Corymbograptus deflexus带。同时在特马豆克阶顶部也识别出了Hunnegraptus copiosus带,从而在该区确立了一个连续的、可与国内外同期地层精确对比的弗洛阶笔石带序列。Based on materials from the Nanba section in the Yiyang area, Hunan Province, four graptolite zones of the Floian Stage （Lower Ordovician） are identified in ascending order. Tetragraptus approximatus Zone, Pendeograptus fruticosus Zone, Didymograptellus bifidus Zone and Corymbograptus deflexus Zone. No hiatus exists below the Floian Stage in the Nanba section since the T. approxirnatus Zone is underlain directly by the Hunnegraptus copiosus Zone, the topmost graptolite zone of the preceding Tremadocian Stage. As a result, a consecutive graptolite succession of the Floian Stage could be established in the Yiyang area. This succession allows precise correlation of Floian graptolite biostratigraphy between this area and elsewhere home and abroad.

关 键 词：笔石 生物带 弗洛阶 下奥陶统 益阳 湖南 

分 类 号：P534.42[天文地球—古生物学与地层学]