The stratigraphy of the youngest part of the Kimmeridge Clay Formation (Upper Jurassic) of the Dorset type area
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这份报纸简短为寒武纪的系统的全球阶段总结正式批准的全球标准 Stratotype 节和点和建议 GSSP (GSSP ) 。Luoyixi 镇附近的 Luoyixi 节， Guzhang，西北的湖南为全球 Guzhangian 阶段的底作为边界 stratotype 被批准，它是一个未命名的系列的最高的阶段作为寒武纪的系列 3 暂时地称为。GSSP 位置谎言在在节的 Huaqiao 形成的底上面的 121.3 m，与大都会的 agnostoid 三叶虫 Lejopyge leavigata 的第一外观与一致。在 Duibian 村庄的 Duibian B 节， Jiangshan，西方的浙江，为是 Furongian 系列的第二个阶段的建议全球 Jiangshanian 阶段的底作为边界 stratotype 被建议。建议 GSSP 位置谎言在在节的 Huayansi 形成的底上面的 108.12 m，与大都会的 agnostoid 三叶虫 Agnostotes orientalius 的第一外观与一致。这根地平线也与大都会的 polymerid 三叶虫 Irvingella angustilimbata 的第一外观。
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Based on the precursors' study,the authors explicate the basic concepts of the high-resolution event stratigraphy and its theory basis in this paper.The high-resolution event stratigraphy is divided into four units:unit representing physical events,unit representing chemical events,unit representing biological events and composite events.An example from Global Permian-Triassic Boundary Stratotype Section——the Meishan section,Changxing County,Zhejiang Province,China is taken to discuss the application on the high-resolution event stratigraphy units.
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ジュラ系の国際境界模式層序・位置がオーストリア国チロル州のクーヨッホ層序断面に置かれることが2010年に正式に決まった.それはジュラ紀最古のアンモナイトPsiloceras spelae tirolicumが初産出する層準で,ケンドゥルバッハ層の基底から5.8 m上位に位置する.筆者らは2012年に行われた国際堆積学会の巡検でクーヨッホ層序断面を訪れたので,その概要を紹介する.ジュラ系の国際模式境界が置かれた北部石灰アルプスでは,近年の研究でオリストリスの基質をなす珪質堆積岩からジュラ紀の放散虫化石が数多く報告され,年代決定に有効なことが示された.本稿では特に研究が進んでいるザルツカンマーグート地方の代表的なジュラ紀層を紹介し,北部石灰アルプスの地質構造発達史を概観する.
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Abstract: This paper briefly summarizes an officially ratified Global Standard Stratotype‐section and Point (GSSP) and a proposed GSSP for global stages of the Cambrian System. The Luoyixi section near Luoyixi town, Guzhang, northwestern Hunan is ratified as the boundary stratotype for the base of the global Guzhangian Stage, which is the upmost stage of an unnamed series termed provisionally as Cambrian Series 3. The GSSP position lies 121.3 m above the base of the Huaqiao Formation in the section, coinciding with the first appearance of the cosmopolitan agnostoid trilobite Lejopyge leavigata . The Duibian B section at Duibian village, Jiangshan, western Zhejiang, is proposed as the boundary stratotype for the base of the proposed global Jiangshanian Stage that is the second stage of the Furongian Series. The proposed GSSP position lies 108.12 m above the base of the Huayansi Formation in the section, coinciding with the first appearance of the cosmopolitan agnostoid trilobite Agnostotes orientalius . This horizon is also with the first appearance of the cosmopolitan polymerid trilobite Irvingella angustilimbata .
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Since 1992, the siliciclastic Fortune Head section(southeastern Newfoundland, Canada) and the base of the Trichophycus pedium trace fossil zone have together served as the Precambrian Cambrian(PreC C) boundary global stratotype section and point(GSSP). However, the fact that the Fortune Head section consists mainly of siliciclastic rocks makes it difficult to correlate this section with boundary sections consisting mainly of carbonate rocks, which contain abundant small shelly fossils(SSFs) and can also be correlated using stable carbon isotope data. We propose that a predominantly carbonate section near the town of Dahai, eastern Yunnan Province, southwestern China, be designated a supplementary stratotype for the PreC C boundary GSSP, for the following reasons:(1) the Dahai section is continuous, consisting of the Neoproterozoic Baiyanshao and Daibu members conformably overlain by the Early Cambrian Zhongyicun and Dahai members and Shiyantou Formation; (2) the Early Cambrian units contain abundant SSFs representing four assemblage zones; (3) the Dahai section can be correlated with numerous other sections using stable C isotopic chemostratigraphy; (4) the famous Meishucun section, located not far from Dahai, contains both abundant SSFs and trace fossils and can be readily correlated with the SSF rich Dahai section. We further propose that the base of the Cambrian System be placed at the base of the first SSF assemblage zone(the Anabarites Protohertzina Zone), which in the Dahai section coincides with the base of Bed 11.
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Auxiliary boundary stratotypes have unquestionable value in extending the knowledge of a Global boundary Stratotype Section and Point (GSSP) between continents, biogeographic provinces, climatic zones, depositional facies and preservational states.Two kinds of such stratotypes are in use, the Auxiliary Stratotype Point and the Auxiliary Stratotype Section, although only the Auxiliary Stratotype Point is recognised by the International Commission on Stratigraphy (ICS).The Standard Auxiliary Boundary Stratotype, which is based on the Auxiliary Stratotype Section, is proposed here as a formal replacement for the Auxiliary Stratotype Point.As such, it would provide a detailed complementary expression of the boundary interval without the designation of a specific point -no such points can replicate the precise level defined by a GSSP either conceptually or in practice.We recommend that requirements for future Standard Auxiliary Boundary Stratotypes broadly follow ICS guidelines for GSSPs but be applied with greater flexibility.Past practice reveals inconsistency in the protocols used for approving such auxiliary boundary stratotypes.We propose that in future they require approval by the respective ICS subcommission.More than one Standard Auxiliary Boundary Stratotype may support a single GSSP but restraint should be exercised in approving them, and each will always be subordinate to the GSSP itself.
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