戎嘉余,陈旭,詹仁斌,樊隽轩,王怿,张元动,李越,黄冰,吴荣昌,王光旭,刘建波

• 1:现代古生物学和地层学国家重点实验室
• 2:中国科学院南京地质古生物研究所
• 3:北京大学地球和空间科学学院

摘要(Abstract)：

贵州桐梓红花园山王庙的奥陶系-志留系分界地层出露好、有笔石带控制且发育介壳相化石,一直被认为是华南最佳剖面之一。本文对该剖面重新剖析,结合桐梓县境南区另外几条剖面的资料分析,提出如下新认识:山王庙剖面的"赫南特贝层"(HirnantiaBed:AFA295-305)和"介壳层"(Shelly Bed:AFA306-311c)宜合并统称为观音桥层,皆归于奥陶系;对照宜昌王家湾,将观音桥层与Normalograptus extraordinarius带上部和N.persculptus带下部对比;确定观音桥层与龙马溪组之间缺失N.persculptus带上部、A.ascensus带和P.acuminatus带大部分的地层。典型赫南特贝动物群延至A.ascensus带甚至更高层位的观点应予以修正。靠近黔中古陆北缘的诸多地点,观音桥层的厚度虽有变化,均宜视为同期沉积,唯上覆地层时代不同。赫南特贝动物群是在特定时期、特定环境中生存的特定底栖生物群落,是奥陶纪末大灭绝首幕后的产物,指示了寒凉、海退、相对浅水、底域富氧的环境条件,有重要的时代、环境和古地理意义。

关键词(KeyWords)： 奥陶系-志留系界线地层;赫南特贝动物群;假整合;观音桥层;桐梓;贵州

Abstract:

Keywords:

基金项目(Foundation): 现代古生物学和地层学国家重点实验室、973项目课题(2006CB806402);; 科技部基础性工作专项(2006FY120300-5);; 国家杰出青年基金(No.40825006)的资助

作者(Author): 戎嘉余,陈旭,詹仁斌,樊隽轩,王怿,张元动,李越,黄冰,吴荣昌,王光旭,刘建波

DOI: 10.19839/j.cnki.dcxzz.2010.04.001

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