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首页> 外文期刊>Stratigraphy >New members of the Cutoff Formation in the southern Guadalupe Mountains near the Global Stratotype Section and Point for the base of the Roadian Stage, Texas
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New members of the Cutoff Formation in the southern Guadalupe Mountains near the Global Stratotype Section and Point for the base of the Roadian Stage, Texas

机译：南瓜大厦南部截止地区的新成员，附近全球划线部分和德克萨斯州北京舞台基地的点

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摘要

The Global Stratotype Section and Point (GSSP) for the base of the Roadian Stage is identified within the Cutoff Formation in Guadalupe Mountains National Park (GMNP). Previous mapping of the Cutoff Formation near the shelf margin of the buried late Kungurian (late Leonardian using North American terminology) Victorio Peak and equivalent Bone Spring platform proposed a three-member subdivision for this unit based upon the recognition of lithological changes and unconformities. New mapping conducted to the south of these previously studied outcrops identifies an undocumented succession of unconformity-bound carbonates, shales, and sandstones situated between the members described in previous work. These units are positioned demonstratively above the GSSP in Stratotype Canyon and thus represent a previously undocumented record of the earliest Roadian Stage in GMNP. In accordance with the North American stratigraphic code, this work includes a description of the facies, boundaries, thickness, and lateral extent and correlations in a proposition for introducing two new members to the stratigraphy of the Cutoff Formation. In ascending order, these members include the Butterfield Member and the Rest Area Member. The Butterfield Member is an interval of grain- and mud-dominated carbonate deposits which are distinct from the underlying siliceous shale of the established El Centro Member and is bounded above by shales of the Rest Area Member. The Rest Area Member represents a lower shale, middle mud-dominated carbonate, and upper conglomerate and sandstone triplet, which is distinct from the overlying thin-bedded carbonate deposits of the established Williams Ranch Member. Both of these members pinch out to the south of the GSSP and have the potential to yield specimens of biota extant during the earliest Roadian Stage that are not currently sampled. Faunal specimens of this kind have the potential to improve correlations of the basal boundary for the Roadian Stage to areas
机译：道路阶段基地的全球划线部分和点（GSSP）在瓜达卢佩山国家公园（GMNP）的截止形成范围内。以前的截止形成附近埋藏后期Kungurian的架子边缘（使用北美术语的晚Leonardian）维多利雷峰和等同骨弹簧平台提出了基于对岩性变化和不整合的识别的三个成员细分。在这些先前研究的露头的南部进行的新映射识别未证实的连续连续的无关纳米碳酸盐，Shales和位于以前的工作中描述的成员之间的砂岩。这些单位在划型峡谷中的GSSP中公正地定位，因此代表了GMNP中最早的道路阶段的先前未记录的记录。根据北美地层代码，这项工作包括在将两个新成员引入截止地层的地层的主张中的相对，边界，厚度和横向范围和相关性的描述。按升序，这些成员包括Butterfield成员和其余区域构件。 Butterfield构件是晶粒和泥浆支配的碳酸盐沉积物的间隔，其与所建立的EL中心成员的底层硅质页岩不同，并且在其余区域构件的Shales上方界定。其余区域构件代表较低的页岩，中间泥粒子碳酸化合物和上部凝聚层和砂岩三重胶片，其与已建立的威廉姆斯牧场构件的覆盖薄层碳酸盐沉积物不同。这两个成员都夹在GSSP的南部，并在目前没有采样的最早的道路阶段期间有可能产生生物群地区的标本。这种群体标本具有提高道路阶段的基础边界与地区的基础边界的相关性

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  • 来源
    《Stratigraphy》 |2018年第2期|共25页
  • 作者

    Hurd Gregory S.; Kerans Charles; Fullmer Shawn; Janson Xavier;

  • 作者单位

    Univ Texas Austin Jackson Sch Geosci Bur Econ Geol 10100 Burnet Rd Bldg 130 Austin TX 78758 USA;

    Univ Texas Austin Jackson Sch Geosci Bur Econ Geol 10100 Burnet Rd Bldg 130 Austin TX 78758 USA;

    ExxonMobil Upstream Res Co 22777 Springwood Village Pkwy Spring TX 77389 USA;

    Univ Texas Austin Jackson Sch Geosci Bur Econ Geol 10100 Burnet Rd Bldg 130 Austin TX 78758 USA;

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  • 正文语种 eng
  • 中图分类 地质学;
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