鄂西地区长阳组的时代问题ON AGE OF THE CHANGYANG FORMATION OF WESTERN HUBEI
谈力,李鑫,孙元林
摘要(Abstract)：
对长阳组命名剖面的重新观察和研究表明,原认定的长阳组层位不存在误认的问题。来自长阳组命名剖面和相邻剖面长阳组的两件牙形石样品的分析结果显示:长阳组的牙形石化石组合以Siphonodella levis大量发育为特征,兼有少量的Polygnathus inornatus、P.cf.symmetricus、Bispathodus aculeatus和Pseudopolygnathus originalis等,未见Icriodus等典型的泥盆纪分子。此结果不支持长阳组属于泥盆系的论点。长阳组中的牙形石和腕足类等化石组合支持长阳组的层位与黔南地区的汤耙沟组下部、湘中地区的马栏边组大部(或刘家塘组下部)、桂北地区的尧云岭组,以及下扬子苏皖地区五通组擂鼓台段顶部(或老坎组或陈家边组)的层位相当,属于杜内阶的下部的论点。上覆金陵组可与黔南地区的汤耙沟组上部、湘中地区的马栏边组顶部至陡岭坳组(或刘家塘组上部)和桂北地区的英塘组等地层对比,属于杜内阶的上部。
关键词(KeyWords)： 生物地层;牙形石;长阳组;杜内阶;石炭系;湖北
基金项目(Foundation): 国家自然科学基金项目(No.40572004)资助
作者(Author): 谈力,李鑫,孙元林
DOI: 10.19839/j.cnki.dcxzz.2011.01.002
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