| 陕西耀县地区上奥陶统的头足类 |
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| 引用本文：赖才根.1981.陕西耀县地区上奥陶统的头足类[J].地球学报,3(1):85. |
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| 中文摘要:<正> 一九七五年,林宝玉、郭振明和作者调查陕、甘、宁西南缘的奥陶系时,划分耀县桃曲坡地区的奥陶系为三道沟组、桃曲坡组和背锅山组(桃曲坡组是新命名的地层单位)。三道沟组为友及深灰色块状灰岩夹少量砾状灰岩,顶部10米岩层变薄,总厚80米。桃曲坡组和背锅山组以灰色薄层泥质灰岩为主,厚100米。以紫红色团块状灰岩做背锅山组的底界将该二组分开。在编写“中国地层”一书的过程中,我们已将桃曲坡组与背锅山组合并、称桃曲坡组,原三道沟组顶部10米薄层灰岩亦归入桃曲坡组的底部。这样,三道沟组的岩性均由厚层块状灰岩组成；桃曲坡组以薄层灰岩为主，仅中部夹钙质页岩（产笔石），上部夹紫红色团块状灰岩。 |
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| THE UPPER ORDOVICIAN CEPHALOPODS OF YAOXIAN AREA,SHAANXI PROVINCE |
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| Abstract:The Sandaogou formation and overlying Taoqupo formation constitutethe Ordovician of the Yaoxian area, Shaanxi. Two cephalopod faunas arerecognized. Tofangoceras shaanxiense fauna occurs in the top of Sandaogouformation and the lowest part of Taoqupo formation, and belongs to thePagoda or Miaopo--Pagoda stage. The other fauna Yaoxianoceras latilobatumoccurs in the top of Taoqupo formation and belongs to the early Wufengstage.Therefore the Lower-Upper Ordovician boundary lies within the Sandaogou formation. |
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