湖南永顺、桃源地区中-上奥陶统大田坝组生物地层新见NEW BIOSTRATIGRAPHIC DATA OF THE MIDDLE–UPPER ORDOVICIAN DATIANBA FORMATION FROM YONGSHUN AND TAOYUAN AREAS,HUNAN,CHINA
方翔,甄勇毅,张元动,王志浩,李文杰,马譞
摘要(Abstract):
通过对湖南永顺和桃源4条中–上奥陶统剖面的牙形刺生物地层研究,在湘西北地区中、上奥陶统原先划分(Pygodus anserinus-Yangtzeplacognathus jianyeensis带和Pygodus serra生物带)的基础上,自下而上识别出:牯牛潭组顶部的Pygodus serra生物带(达瑞威尔阶上部)、大田坝组下部的Pygodus anseinus-Yangtzeplacognathus jianyeensis生物带(达瑞威尔阶顶部–桑比阶下部)、大田坝组中部的Baltoniodus variabilis生物带(桑比阶中部)、大田坝组上部的Baltoniodusalobatus生物带(凯迪阶下部–桑比阶上部),以及大田坝组顶部–宝塔组下部的Hamarodus brevirameus生物带(凯迪阶中部)。这一台地边缘相区的牙形刺生物地层序列与扬子台地中心相区的湖北宜昌、重庆石柱及南京江宁等地的牙形刺生物带几乎一致,与斜坡相区的牙形刺生物带也可以进行很好的对比,为台地边缘相区、中心相区以及斜坡相区地层精细对比提供了新的依据,也证明了湖南永顺、桃源(茅草铺)地区应属于扬子台地区。
关键词(KeyWords): 大田坝组;牙形刺;生物地层;中–上奥陶统;永顺;桃源;湖南
基金项目(Foundation): 中国科学院(XDB26000000;SAFEA 20140491530);; 地质调查项目(DD20190009);; 国家科技重大专项(2017ZX05036-001-004;2017ZX05035-002-001)联合资助;; IGCP653项目“奥陶纪生物大辐射的启动过程”的阶段成果
作者(Author): 方翔,甄勇毅,张元动,王志浩,李文杰,马譞
DOI: 10.19839/j.cnki.dcxzz.2019.02.005
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