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  1. Article ; Online: Isotopic evidence for temperate oceans during the Cambrian Explosion.

    Wotte, Thomas / Skovsted, Christian B / Whitehouse, Martin J / Kouchinsky, Artem

    Scientific reports

    2019  Volume 9, Issue 1, Page(s) 6330

    Abstract: The Cambrian Explosion was a key event in the evolution of life on Earth. This event took place at a time when sea surface temperatures have been proposed to reach about 60 °C. Such high temperatures are clearly above the upper thermal limit of 38 °C for ...

    Abstract The Cambrian Explosion was a key event in the evolution of life on Earth. This event took place at a time when sea surface temperatures have been proposed to reach about 60 °C. Such high temperatures are clearly above the upper thermal limit of 38 °C for modern marine invertebrates and preclude a major biological revolution. To address this dichotomy, we performed in situ δ
    Language English
    Publishing date 2019-04-19
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-019-42719-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Atmosphere-ocean oxygen and productivity dynamics during early animal radiations.

    Dahl, Tais W / Connelly, James N / Li, Da / Kouchinsky, Artem / Gill, Benjamin C / Porter, Susannah / Maloof, Adam C / Bizzarro, Martin

    Proceedings of the National Academy of Sciences of the United States of America

    2019  Volume 116, Issue 39, Page(s) 19352–19361

    Abstract: The proliferation of large, motile animals 540 to 520 Ma has been linked to both rising and declining ... ...

    Abstract The proliferation of large, motile animals 540 to 520 Ma has been linked to both rising and declining O
    MeSH term(s) Animals ; Atmosphere/chemistry ; Biological Evolution ; Carbonates/chemistry ; Earth, Planet ; Ecosystem ; Geologic Sediments/chemistry ; Isotopes/analysis ; Oceans and Seas ; Oxygen/analysis ; Photosynthesis ; Seawater/chemistry ; Time ; Uranium/analysis
    Chemical Substances Carbonates ; Isotopes ; Uranium (4OC371KSTK) ; Oxygen (S88TT14065)
    Language English
    Publishing date 2019-09-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1901178116
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
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  3. Book ; Online: Carbon and oxygen isotope ratios, and geochemistry of the Precambrian-Cambrian Sukharikha River section, northwestern Siberian platform, supplementary data to: Kouchinsky, Artem; Bengtson, Stefan; Pavlov, Vladimir; Runnegar, Bruce; Torssander, Peter; Young, Edward; Ziegler, Karen (2007): Carbon isotope stratigraphy of the Precambrian-Cambrian Sukharikha River section, northwestern Siberian platform. Geological Magazine, 144(3), 1-10

    Kouchinsky, Artem / Bengtson, Stefan / Pavlov, Vladimir / Runnegar, Bruce / Torssander, Peter / Young, Edward / Ziegler, Karen

    2007  

    Abstract: A high-resolution carbon isotope profile through the uppermost Neoproterozoic-Lower Cambrian part of the Sukharikha section at the northwestern margin of the Siberian platform shows prominent secular oscillations of d13C with peak-to-peak range of 6-10 ?. ...

    Abstract A high-resolution carbon isotope profile through the uppermost Neoproterozoic-Lower Cambrian part of the Sukharikha section at the northwestern margin of the Siberian platform shows prominent secular oscillations of d13C with peak-to-peak range of 6-10 ?. There are six minima, 1n-6n, and seven maxima 1p-7p, in the Sukharikha Formation and a rising trend of d13C from the minimum 1n of -8.6 ? to maximum 6p of +6.4 ?. The trough 1n probably coincides with the isotopic minimum at the Precambrian-Cambrian boundary worldwide. Highly positive d13C values of peaks 5p and 6p are typical of the upper portion of the Precambrian-Cambrian transitional beds just beneath the Tommotian Stage in Siberia. A second rising trend of d13C is observed through the Krasnoporog and lower Shumny formations. It consists of four excursions with four major maxima that can be cor related with Tommotian-Botomian peaks II, IV, V, and VII of the reference profile from the southeastern Siberian platform. According to the chemostratigraphic cor relation, the first appearances of the index forms of archaeocyaths are earlier in the Sukharikha section than in the Lena-Aldan region.
    Language English
    Dates of publication 2007-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1017/S0016756807003354
    DOI 10.1594/PANGAEA.526943
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  4. Book ; Online: Carbon and oxygen isotope ratios of Selinde River, southeastern Siberian platform, supplementary data to: Kouchinsky, Artem; Bengtson, Stefan; Pavlov, Vladimir; Runnegar, Bruce; Val'kov, Anatolij K; Young, Edward (2005): Pre-Tommotian age of the lower Pestrotsvet Formation in the Selinde section on the Siberian platform: carbon isotopic evidence. Geological Magazine, 142(4), 319-325

    Kouchinsky, Artem / Bengtson, Stefan / Pavlov, Vladimir / Runnegar, Bruce / Val'kov, Anatolij K / Young, Edward

    2005  

    Abstract: Carbon isotopic data from the Selinde section in the southeastern part of the Siberian platform area are correlated with the reference isotopic profile from the Lower Cambrian stratotype sections of the Lena Aldan region, but also show additional d13C ... ...

    Abstract Carbon isotopic data from the Selinde section in the southeastern part of the Siberian platform area are correlated with the reference isotopic profile from the Lower Cambrian stratotype sections of the Lena Aldan region, but also show additional d13C excursions unrecognized there. The chemostratigraphic correlation suggests that the geological and fossil record of the lower Pestrotsvet Formation in the Selinde section has a deeper history than the stratotype region. This conclusion is important for both constraining the age of the earliest Cambrian marine transgression on the Siberian platform and providing a clearer understanding of the pace and order of early Cambrian geochemical and biological events.
    Language English
    Dates of publication 2005-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1017/S0016756805000865
    DOI 10.1594/PANGAEA.688263
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  5. Book ; Online: Geological investigation of a section at Kulyumbe river in Siberia, supplementary data to: Kouchinsky, Artem; Bengtson, Stefan; Gallet, Y; Korovnikov, I; Pavlov, Vladimir; Runnegar, Bruce; Shields, Graham; Veizer, Jan; Young, Edward; Ziegler, Karen (2008): The SPICE carbon isotope excursion in Siberia: a combined study of the upper Middle Cambrian-lowermost Ordovician Kulyumbe River section, northwestern Siberian Platform. Geological Magazine, 145(5), 609-622

    Kouchinsky, Artem / Bengtson, Stefan / Gallet, Y / Korovnikov, I / Pavlov, Vladimir / Runnegar, Bruce / Shields, Graham / Veizer, Jan / Young, Edward / Ziegler, Karen

    2008  

    Abstract: An integrated, high-resolution chemostratigraphic (C, O and Sr isotopes) and magnetostratigraphic study through the upper Middle Cambrian - lowermost Ordovician shallow-marine carbonates of the northwestern margin of the Siberian Platform is reported. ... ...

    Abstract An integrated, high-resolution chemostratigraphic (C, O and Sr isotopes) and magnetostratigraphic study through the upper Middle Cambrian - lowermost Ordovician shallow-marine carbonates of the northwestern margin of the Siberian Platform is reported. The interval was analysed at the Kulyumbe section, which is exposed along the Kulyumbe River: an eastern tributary of the Enisej River. It comprises the upper Ust'-Brus, Labaz, Orakta, Kulyumbe, Ujgur, and lower Iltyk formations and includes the Steptoean positive carbon isotopic excursion (SPICE) studied here in detail from upper Cambrian carbonates of the Siberian Platform for the first time. The peak of the excursion, showing d13C positive values as high as +4.6? and least-altered 87Sr/86Sr ratios of 0.70909, is reported herein from the Yurakhian Horizon of the Kulyumbe Formation. The stratigraphic position of the SPICE excursion does not support traditional correlation of the boundary between the Orakta and Labaz formations at Kulyumbe River with its supposedly equivalent level in Australia, Laurentia, South China, and Kazakhstan, where the Glyptagnostus stolidotus and G. reticulatus biozones are known to immediately precede the SPICE excursion and span the Middle-Upper Cambrian boundary. The Cambrian-Ordovician boundary is probably situated in the middle Nyajan Horizon of the Iltyk Formation, in which carbon isotope values show a local maximum below a decrease in the upper part of the Nyajan Horizon, attributed herein to the Tremadocian. A refined magnetic polarity sequence shows that the geomagnetic reversal frequency was very high during the Middle Cambrian at 5-10 reversals per Ma, assuming a total duration of ~10 Ma and up to 100 magnetic intervals in the Middle Cambrian. By contrast, the sequence attributed herein to the Upper Cambrian on chemostratigraphic grounds contains only 10-11 magnetic intervals.
    Preprint in Open Access hdl:10013/epic.30209.d001
    Language English
    Dates of publication 2008-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1017/S0016756808004913
    DOI 10.1594/PANGAEA.687608
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  6. Article: Fossilized embryos are widespread but the record is temporally and taxonomically biased.

    Donoghue, Philip C J / Kouchinsky, Artem / Waloszek, Dieter / Bengtson, Stefan / Dong, Xi-ping / Val'kov, Anatoly K / Cunningham, John A / Repetski, John E

    Evolution & development

    2006  Volume 8, Issue 2, Page(s) 232–238

    Abstract: We report new discoveries of embryos and egg capsules from the Lower Cambrian of Siberia, Middle Cambrian of Australia and Lower Ordovician of North America. Together with existing records, embryos have now been recorded from four of the seven continents. ...

    Abstract We report new discoveries of embryos and egg capsules from the Lower Cambrian of Siberia, Middle Cambrian of Australia and Lower Ordovician of North America. Together with existing records, embryos have now been recorded from four of the seven continents. However, the new discoveries highlight secular and systematic biases in the fossil record of embryonic stages. The temporal window within which the embryos and egg capsules are found is of relatively short duration; it ends in the Early Ordovician and is roughly coincident with that of typical "Orsten"-type faunas. The reduced occurrence of such fossils has been attributed to reducing levels of phosphate in marine waters during the early Paleozoic, but may also be owing to the increasing depth of sediment mixing by infaunal metazoans. Furthermore, most records younger than the earliest Cambrian are of a single kind-large eggs and embryos of the priapulid-like scalidophoran Markuelia. We explore alternative explanations for the low taxonomic diversity of embryos recovered thus far, including sampling, size, anatomy, ecology, and environment, concluding that the preponderance of Markuelia embryos is due to its precocious development of cuticle at an embryonic stage, predisposing it to preservation through action as a substrate on which microbially mediated precipitation of authigenic calcium phosphate may occur. The fossil record of embryos may be limited to a late Neoproterozoic to early Ordovician snapshot that is subject to dramatic systematic bias. Together, these biases must be considered seriously in attempts to use the fossil record to arbitrate between hypotheses of developmental and life history evolution implicated in the origin of metazoan clades.
    MeSH term(s) Animals ; Australia ; Classification ; Embryo, Nonmammalian/anatomy & histology ; Fossils ; Microscopy, Electron, Scanning ; Nevada ; Siberia
    Language English
    Publishing date 2006-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2020288-X
    ISSN 1525-142X ; 1520-541X
    ISSN (online) 1525-142X
    ISSN 1520-541X
    DOI 10.1111/j.1525-142X.2006.00093.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Book ; Online: Stable isotope measurements along the rivers Malaya Kuonamka and Bol'shaya Kuonamka in Siberia, supplementary data to: Kouchinsky, Artem; Bengtson, Stefan; Missarzhevsky, Vladimir V; Pelechaty, Shane; Torssander, Peter; Val'kov, Anatolij K (2001): Carbon isotope stratigraphy and the problem of a pre-Tommotian Stage in Siberia. Geological Magazine, 138(4), 387 - 396

    Kouchinsky, Artem / Bengtson, Stefan / Missarzhevsky, Vladimir V / Pelechaty, Shane / Torssander, Peter / Val'kov, Anatolij K

    2001  

    Abstract: Carbon isotopic oscillations are useful to elucidate the stratigraphy and biogeochemical events around the Precambrian-Cambrian transition. New isotopic data from the Manykaj and Emyaksin formations of the eastern Anabar Uplift (Siberia) help to ... ...

    Abstract Carbon isotopic oscillations are useful to elucidate the stratigraphy and biogeochemical events around the Precambrian-Cambrian transition. New isotopic data from the Manykaj and Emyaksin formations of the eastern Anabar Uplift (Siberia) help to correlate the Lower Cambrian and Neoproterozoic-Cambrian transitional beds across the Siberian Platform. The similarity of trends and amplitudes of the carbon isotopic curves, together with biostratigraphic and sequence-stratigraphic markers from the Anabar Uplift,provide a precise correlation with the southern part of the Siberian Platform. Diagenesis of argillaceous limestones of the Emyaksin Formation has apparently not affected the primary isotopic variations. The resulting curve is nearly identical in sections about 100km apart in the Tommotian-Atdabanian portion ofthe formation.Relatively frequent and pronounced isotopic oscillations in the lower beds of the Emyaksin Formation fit between features I and II of the southern Siberian isotopic reference scale but are undetected therein owing to the depositional hiatus at the base of the Tommotian Stage in its type section. This cofirms the transgressive onlap from the north suggested by previous studies,and makes the appearance of the Cambrian skeletal fossils on the Siberian Platform less abrupt.The hiatus in the south appears to embrace at least two biostratigraphic zones as recognized in the north. The case is strengthened for a pre-Tommotian Cambrian Stage in Siberia,the biostratigraphic framework for which has been elaborated earlier.
    Language English
    Dates of publication 2001-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    DOI 10.1594/PANGAEA.688698
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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