戎嘉余,陈旭,哈帕尔(D.A.T.Harper),米切尔(C.E.Mitchell)

• 1:中国科学院南京地质古生物研究所!江苏南京210008
• 2:中国科学院南京地质古生物研究所!江苏南京210008
• 3:丹麦哥本哈根大学地质博物馆!哥本哈根DK-1350
• 4:美国纽约州立大学地质系!布法罗NY14260-3050

摘要(Abstract)：

在对鄂西宜昌王家湾和分乡、黔北桐梓红花园、黔东北松桃陆地坪 4条剖面的相关地层和主要门类化石做了新的无间断采集和重新鉴定笔石和腕足动物这两个重要化石门类的基础上 ,发现奥陶纪最末期—志留纪最早期的完整笔石序列与腕足动物等新的化石材料 ,初步了解奥陶纪末集群灭绝后生物幸存的基本特征。经过选择 ,特推荐宜昌王家湾公路旁穿越奥陶 -志留纪界线地层剖面作为建立国际赫南特亚阶的首位候选 (leading candidate)层型 ,并推荐桐梓红花园相关剖面作为辅助候选 (auxiliary candidate)层型。对建立全球赫南特亚阶界线层型的基本条件和国外相关剖面的优缺点作了分析。本文所识别的赫南特亚阶相当于两个笔石带 :下部 N ormalograptus ex-traordinarius- N.ojsuensis带和上部 N.persculptus带。典型的 H irnantia动物群的整体地质历程为奥陶纪最末期 ,相当于 N ormalograptus extraordinarius- N.ojsuensis带和 N.persculptus带的一部分。

关键词(KeyWords)： 奥陶纪;赫南特亚阶;层型;候选剖面

Abstract:

Keywords:

基金项目(Foundation): 中国科学院重点研究项目!( KZ95 2 -J1-0 2 3和 KZ95 2 -J1-4 0 1);; 国家自然科学基金!(No.49672 0 83 )资助

作者(Author): 戎嘉余,陈旭,哈帕尔(D.A.T.Harper),米切尔(C.E.Mitchell)

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