Permian sections of southern Primorye: A link in correlation of stage units in the standard and general stratigraphic scales
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Magnetostratigraphy
Chemostratigraphy
Magnetostratigraphy
Cyclostratigraphy
Stratotype
Conodont
Supergroup
Early Triassic
Trias
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This research was financially supported by grants from the Natural Sciences and Engineering Research Council of Canada (NSERC 7961-215) to Uwe Brand.
Chemostratigraphy
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The δ13C chemostratigraphy of five of the seven Ordovician global stages has been published previously but no such data have been available from the Floian GSSP and most of the Sandbian GSSP in Sweden. This lack of information has now been remedied by isotope data obtained from series of closely spaced shale samples collected from the Floian stratotype at Diabasbrottet in Västergötland and the Sandbian stratotype at Fågelsång in Scania. Although the bases of these stages cannot be precisely tied to levels of conspicuous δ13C excursions, that of the Floian Stage, which is marked by the appearance of the graptolite Tetragraptus approximatus, is between the closely spaced excursions named LTNICE and BFICE. The base of the Sandbian Stage, which is defined as the appearance level of the graptolite Nemagraptus gracilis, is just below a negative excursion previously known as the "Upper Kukruse Low", which is nowadays known as the LSNICE. The relations between chemostratigraphy and graptolite and conodont biostratigraphy in the Swedish GSSPs and some coeval key sections in Baltoscandia, China, and America are briefly discussed. It is concluded that the data at hand indicate that there is good regional agreement in these relations.
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中间的奥陶纪的底(即 Dapingian 舞台) 在 conodont Baltoniodus 的第一本外观资料(一度时髦的风尚) 被定义 ? 在 Huanghuachang， Yichang，中国，而是到要决定的另外的外形遗体的区域的边界的精确关联的 triangularis。此处，我们考察 Huanghuachang 全球标准 Stratotype 节和点(GSSP ) 节的 biostratigraphy 和 chemostratigraphy，并且在 Yichang，和 Hengtang 石场节在附近的 Chenjiahe 节上介绍我们的最近的 stratigraphic 工作， Jiangshan，浙江，它斜坡外形被认为是代表性。象 Chenjiahe 节的 chemostratigraphy 一样的 conodont 和 graptolite biostratigraphy 显示中间的奥陶纪的库也在 graptolite Azygograptus suecicus 地区以内掉落，并且在一次次要的积极的碳同位素旅行以内与高或最大的 13C 值与一致，建议基础边界能乐意地越过全部 Yangtze 峡区域被认出。综合 graptolite 和 conodont biostratigraphy 和 Hengtang 节的 chemostratigraphy， Jiangshan，显示基础边界可能在 graptolite Isograptus caduceus imitatus 以内掉落躺 Azygograptus suecicus 地区，并且与 13C 的显著落下与一致的地区。这差别显示一条多学科的途径是批评的在在哪儿的那些区域识别基础边界 Baltoniodus ? triangularis 是不在的
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The Almonacid de la Cuba section, located in the Iberian Range, in central-eastern Spain, contains an outstanding record of the Pliensbachian-Toarcian boundary (Early Jurassic).Four ammonite assemblages, characterized respectively by the presence of Pleuroceras, Canavaria, Dactylioceras (Eodactylites) and Dactylioceras (Orthodactylites) have been distinguished.The base of the Toarcian is located at level CU35.2, based on the first occurrence of Dactylioceras.The presence of Boreal and Mediterranean taxa allows correlation between both bioprovinces.Magnetostratigraphy shows the most complete record of reversals of the Earth magnetic field for the base of Toarcian.The onset of the positive δ 13 C excursion which has been found in the Toarcian of several sections in Europe has been recorded.Average paleotemperatures for the latest Pliensbachian Spinatum Zone was about 12.5°.Seawater temperature rise during the lowermost Toarcian, reaching average temperatures of 16.7°C at the Tenuicostatum Zone.The 87 Sr/ 86 Sr curve fits with the LOWESS calibration curve.
Ammonite
Magnetostratigraphy
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Chemostratigraphy
Conodont
Tournaisian
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Chemostratigraphy
Conodont
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Sequence Stratigraphy
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