甘肃井儿川纳缪尔期蜓类化石的发现及地质意义  

DISCOVERY OF THE NAMURIAN FUSULINIDS FROM JINGEKCHUAN OF GANSU AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：侈再三 李汉业[1] 

机构地区：[1]兰州大学地质系

出　　处：《甘肃科学学报》1994年第3期19-26,共8页Journal of Gansu Sciences

基　　金：国家自然科学基金;南京地质古生物研究所

摘　　要：太原组以产有Ｄｉｃｔｙｏｃｌｏｓｔｕｓｔａｉｙｕａｎｆｕｅｎｓｉｓ，Ｄ．ｕｒａｌｉｃｕｓ及Ｃｈｏ－ｒｉｓｔｉｔｅｓ，ｎｏｒｉｎｉ等化石，认为是我国华北斯蒂芬期标准岩石地层单位。该类动物群是在纳缪尔期沉积的、原不包括类而建立的这个组上部结束之处发现的。本文建立纳缪尔Ｂ─Ｃ期Ｏｚａｗａｉｎｅｌｌａｕｍｂｏｎａｔａ─Ｍｉｌｌｅｒｅｌ－ｌａｍａｒｂｌｅｎｓｉｓ带。原组的下部，由于纳缪尔期生物面貌的存在，显示了纳缪早期特征。在甘肃靖远井儿川煤矿剖面中（图１），石炭系上、下统的界线是从第１２层的底与第１１层之顶两者之间通过。The Taiyuan Formation containing Dictyoclostus taiyuanfuensis,D,uralicus and Choristitesnorini etc,used to be considered as a standard lithostratigraphic unit of the Stephanian in thenorthern China. A new discovery of the fusulinid fauna from the Geological section of this forma-tion resulted in the conclusion that the upper part of this formation where the fusulinids werefound were deposited during the Namurian time,Afusulinid biozone,the Namurian B─C Oza-wainella umbonata─Millerella marblensis zone is established in this paper.The lower part of thisformation appears to belong to the early Namurian(A)due to the existence of a paleontoligicgroup with the Namurian aspect.The Mid─Carboniferous boundary in this formation passes be-tween the bottom of bed 12 and the top of bed 11,as found in the Geoligical section(Fig,1)ofthe Jingerchuan coal mine,Jingyuan,Gansu。

关 键 词：蜓类 晚石炭世 纳缪尔期 化石 甘肃 

分 类 号：Q915.2[天文地球—古生物学与地层学]