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Stratigraphical distribution of the Ordovician conodont Erraticodon Dzik in Argentina

机译:阿根廷奥陶纪牙形石Erraticodon Dzik的地层分布

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摘要

Three different species of the Ordovician genus Erraticodon Dzik are described and illustrated. Erraticodon patu Cooper is reported from the Lower-Midde Ordovician strata of the Acoite and Alto del Condor formations. E. cf. Erraticodon balticus and Erraticodon hexianensis from Middle Ordovician carbonate deposits of the San Juan Formation are analyzed and compared to specimens of these species from Australia, China, Newfoundland, and Baltica. E patu and £ hexianensis are recorded for first time in the San Juan Formation of Precordillera. The elements of E. cf. E. balticus resemble closely E. balticus Dzik but lack the important denticle on the posterior process of the S elements. An evaluation of the stratigraphic occurrences of these species relative to those of key Lower and Middle Ordovician conodont species such as Trapezognathus diprion Lindstroem, Oepikodus intermedius Serpagli, Baltoniodus triangularis (Lind-strom), Baltoniodus navis Lindstroem, Yangtzeplacognathus crassus (Chen and Zhang) and Eoplacognathus pseudoplanus (Viira) indicates they value for biostratigraphic correlation.
机译:描述和说明了奥陶纪Erraticodon Dzik属的三种不同种类。 Erraticodon patu Cooper是从Acoite和Alto del Condor地层的下中奥陶纪地层中报告的。 E.比照分析了来自圣胡安组中奥陶纪碳酸盐矿床的波罗的海草和赫拉克西种,并与来自澳大利亚,中国,纽芬兰和波罗的海的这些物种的标本进行了比较。 E Patatu和£hexianensis首次在Precordillera的San Juan组中记录。 E. cf.的要素波罗的海大closely(E。balticus)与波罗的大D(E。balticus Dzik)非常相似,但缺少S元素后突的重要齿齿。相对于关键的下奥陶纪和中奥陶纪主要牙形石物种(如斜方蛇Tra,林间蛇皮,蛇纹石,三角龙(Lind-strom),巴尔通尼奥斯·林维斯特罗姆,扬子白垩纪和陈氏s)的地层学评价拟扁柏(Viira)表示它们具有生物地层相关性。

著录项

  • 来源
    《Journal of South American earth sciences》 |2013年第8期|224-234|共11页
  • 作者单位

    CONICET - CIGEOBIO - Universidad National de San Juan, Facultad de Ingenieria, Institute de Investigations Mineras, Urquiza y Libertador, 5400 San Juan, Argentina;

    Instituto Superior de Correlation Geologica, (CONICET-UNT), Miguel Lillo 205, 4000 San Miguel de Tucuman, Argentina;

    CONICET - CIGEOBIO - Universidad National de San Juan, Facultad de Ingenieria, Institute de Investigations Mineras, Urquiza y Libertador, 5400 San Juan, Argentina;

    CONICET - CIGEOBIO - Universidad National de San Juan, Facultad de Ingenieria, Institute de Investigations Mineras, Urquiza y Libertador, 5400 San Juan, Argentina;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ordovician; Conodonts; Erraticodon; Argentina;

    机译:奥陶纪;牙形石毛rat阿根廷;

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