摘要
吉林省中部的二道沟组、小绥河组、张家屯组的时代归属，一直是国内、外地质学家争议的问题之一。根据无脊椎动物化石鉴定结果，张家屯组的时代为志留纪Ｌｕｄｌｏｗ晚期至Ｐｒｉｄｏｌｉ早期，小绥河组为志留纪末Ｐｒｉｄｏｌｉ期或泥盆纪初Ｌｏｃｈｋｏｖ期，二道沟组为早泥盆世Ｌｏｃｈｋｏｖ早期。根据上述地层中珊瑚和腕足动物化石，推测它们当时是生活在正常浅海的生活环境中，大致相当于底栖组合ＢＡ３。我国东北地区中古生代存在着两个不同的动物地理区：华北地台北缘产Ｒｅｔｚｉｅｌｌａ腕足动物群和Ｃａｒｌｉｎａｓｔｒａｅａ珊瑚动物群，吉林中部就位于这一个动物地理区范围之内；西伯利亚地台南缘产Ｔｕｖａｅｌｌａ腕足动物群。
Three lithostratigraphical units of central Jilin,NE China,Zhangjiatun, Xiaosuihe and Erhtaokou Formations, are defined as late Ludlow to early Pridoli,Pridoli or Lochkov,and early Lochkov in age respectively based on evidences of various kinds of invertebrates.The brachiopods and corals in these formations may have lived in normal shallow marine environment and a Benthic Assemblage 3 assignment is suggested.Two distinctive zoogeographic provinces in NE China during Middle Palaeozoic are fairly clearly recognized:brachiopod Retziella fauna and coral Carlinastraea fauna occurring along the northern margin of North China Platform and brachiopod Tuvaella fauna along the southern margin of Siberian Platform.
出处
《地层学杂志》
CSCD
北大核心
1995年第4期241-249,共9页
Journal of Stratigraphy
基金
中国科学院古生物与古人类学科基础研究特别费910403项资助
