湖北宜昌地区下-中奥陶统界线疑源类生物地层学意义  

ACRITARCHS FROM THE LOWER-MIDDLE ORDOVICIAN BOUNDARY(DAPINGIAN) IN YICHANG REGION,SOUTH CHINA:THEIR BIOSTRATIGRAPHICAL IMPLICATION

作　　者：李军[1,2] 燕夔[1,2] Thomas SERVAIS 

机构地区：[1]中国科学院南京地质古生物研究所 [2]现代古生物学与地层学国家重点实验室 [3]FRE3298 du CNRS,Géosystèmes,Universitéde Lille1,SN5,USTL,F-59655 Villeneuve d'Ascq,France

出　　处：《微体古生物学报》2011年第4期357-369,共13页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(40802006;41072001);现代古生物学与地层学国家重点实验室方向性项目(2009404)资助

摘　　要：根据牙形类Baltoniodus?triangularis的首现,中奥陶统和大坪阶底界已界定于湖北宜昌黄花场剖面大湾组底界之上10.57 m。对黄花场剖面以及邻近的大坪剖面大湾组疑源类研究表明,某些疑源类属种具有生物地层学意义,其首现可用于识别奥陶系下/中统界线。The base of the Middle Ordovician Series and Dapingian has been defined at a point 10.57 m above the base of the Dawan Formation in the Huanghuachang Section at Yichang,Hubei Province,South China by the first appearance of the conodont Baltoniodus? triangularis.The results of acritarch investigation into the Dawan Formation at the Huanghuachang and the nearby Daping sections indicates that based on their FADS,some of the acritarch taxa may be of biostratigraphical potential for recognition of the Lower-Middle Ordovician boundary.

关 键 词：疑源类 下/中奥陶统界线 生物地层学 宜昌 湖北 华南 

分 类 号：Q911[天文地球—古生物学与地层学]