山东莱芜地区晚寒武世炒米店组牙形石生物地层学研究  

THE CONODONT BIOSTRATIGRAPHY OF THE UPPER CAMBRIAN CHAOMIDIAN FORMATION IN THE LAIWU AREA, SHANDONG PROVINCE

作　　者：武桂春[1,2] 姚建新[1] 纪占胜[1] 刘书才 

机构地区：[1]中国地质科学院地质研究所 [2]北京大学地球与空间科学学院,北京1008713 [3]山东省地质科学实验研究院

出　　处：《微体古生物学报》2005年第2期185-195,共11页Acta Micropalaeontologica Sinica

基　　金：中国地质调查局(项目编号200313000054);国家自然科学基金会(项目编号40302002)项目资助。

摘　　要：本文报道了山东莱芜地区黄羊山剖面炒米店组的牙形石生物地层学研究成果。在该剖面上寒武统的炒米店组建立了9个牙形石带,自上而下分别是Cordylodusangulatus带,C.lindstromi带,C.intermedius带,C.proavus带,Eoconodontusnotchpeakensis带,Proconodontusmuelleri带,P.posterocostatus带,P.tenuiserratus带和Prooneotodusrotundatus-Muelleroduserectus带。牙形石动物群的面貌显示该地区炒米店组顶部在时代上已属早奥陶世,表明该地区的寒武-奥陶界线与三山子组白云岩的底界并不一致,后者在层位上稍高。建立并描述了一副牙形石新种Westergaardodinahuangyangshanensissp.nov.。A new Cambro-Ordovician boundary section, Huangyangshan section in Laiwu area, Western Shandong, is reported in this paper. Nine conodont zones are established in Chaomidian Formation of middle to upper Cambrian. They are described respectively in descending order as Cordylodus angulatus Z.,C. lindstromi Z.,C. intermedius Z.,C. proavus Z.,Eoconodontus notch [KG-*9]peakensis Z.,Proconodontus muelleri Z.,Proconodontus posterocostatus Z.,P. tenuiserratus Z.,and Prooneotodus rotundatus-Muellerodus erectus Z. Since Cordylodus angulatus fauna belongs to earlier Ordovician, the Cambro-Ordovician boundary must be located within the uppermost part of the Chaomidian Limestone. And there exists a clear inconsistency between the lithological boundary and the biological one for the latter being a little lower than the former. A new paraconodont species Westergaardodina huangyangshanensis sp. nov. is described in this paper too.

关 键 词：莱芜地区 晚寒武世 炒米店组 牙形石带 生物地层学 新种 寒武-奥陶界线 黄羊山剖面 

分 类 号：Q911.2[天文地球—古生物学与地层学]