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DEVONIAN CONODONTS IN SE AREA OF CHONGQING CITY AND ITS GEOLOGICAL SIGNIFICANCE
Author(s): 
Pages: 282-298
Year: Issue:  3
Journal: Acta Micropalaeontologica Sinica

Keyword:  牙形刺 写经寺组 法门期早期 弗拉斯期 穿时 渝东南地区;
Abstract: 本文研究了渝东南地区3个泥盆纪剖面的牙形刺,黔江濯水剖面的顶部(第7层)产有Palmatolepis quadrantinodosalobata等牙形刺,时代为法门期早期Middle crepida带至Lower rhomboidea带,是本区泥盆纪海相沉积的最高层位;酉阳兴隆剖面(第51层)发现牙形刺Palmatolepis semichatovae等牙形刺,时代为弗拉斯期晚期Lower rhenana带;濯水剖面的5层和6层、黔江水泥厂剖面的5层至7层以及酉阳兴隆剖面的52层和53层均产有较多的弗拉斯期晚期的牙形刺。本区写经寺组、黄家磴组和云台观组都可能是穿时的,写经寺组在各剖面残留厚度不同。写经寺组的时代为弗拉斯期晚期至法门期早期。本区缺少法门期中、晚期的典型的海相沉积。描述了一个新种Polygnathus chongqingensis Wang sp.nov.。
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