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  • Copernicus  (3)
  • London : The Geological Society  (1)
  • 1
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    Cretaceous Climate Events and Short-Term Sea-Level Changes (2020)
    London : The Geological Society
    Details
    Keywords: climate events ; sea-level fluctuations ; greenhouse episode ; sea-level cycles
    Description / Table of Contents: An introduction to causes and consequences of Cretaceous sea-level changes (IGCP 609) / Michael Wagreich, Benjamin Sames, Malcolm Hart and Ismail O. Yilmaz / Geological Society, London, Special Publications, 498, 1-8, 5 February 2020, https://doi.org/10.1144/SP498-2019-156 --- Aquifer-eustasy as the main driver of short-term sea-level fluctuations during Cretaceous hothouse climate phases / Benjamin Sames, M. Wagreich, C. P. Conrad and S. Iqbal / Geological Society, London, Special Publications, 498, 9-38, 4 February 2020, https://doi.org/10.1144/SP498-2019-105 --- The pelagic archive of short-term sea-level change in the Cretaceous: a review of proxies linked to orbital forcing / Michael Wagreich and Veronika Koukal / Geological Society, London, Special Publications, 498, 39-56, 9 December 2019, https://doi.org/10.1144/SP498-2019-34 --- High latitude meteoric δ18O compositions from the Cenomanian Bastion Ridge Formation, Axel Heiberg Island, Canadian Arctic Archipelago: a palaeoclimate proxy from the Sverdrup Basin / Jeffrey B. Ross, G. A. Ludvigson, C. J. Schröder-Adams and M. B. Suarez / Geological Society, London, Special Publications, 498, 57-74, 15 January 2020, https://doi.org/10.1144/SP498-2018-134 --- Chronostratigraphy and terrestrial palaeoclimatology of Berriasian–Hauterivian strata of the Cedar Mountain Formation, Utah, USA / R. M. Joeckel, G. A. Ludvigson, A. Möller, C. L. Hotton, M. B. Suarez, C. A. Suarez, B. Sames, J. I. Kirkland and B. Hendrix / Geological Society, London, Special Publications, 498, 75-100, 13 December 2019, https://doi.org/10.1144/SP498-2018-133 --- Oxygen–carbon isotope composition of Middle Jurassic–Cretaceous molluscs from the Saratov–Samara Volga region and main climate trends in the Russian Platform–Caucasus / Yuri D. Zakharov, Vladimir B. Seltser, Mikheil V. Kakabadze, Olga P. Smyshlyaeva and Peter P. Safronov / Geological Society, London, Special Publications, 498, 101-127, 13 December 2019, https://doi.org/10.1144/SP498-2018-57 --- Late Cretaceous stratigraphy in the Mudurnu–Göynük Basin (Turkey) and inferences on sea-level change in the Late Campanian to Early Maastrichtian / Erik Wolfgring, Michael Wagreich, Ismail O. Yilmaz, Liu Shasha and Katharina Boehm / Geological Society, London, Special Publications, 498, 129-146, 17 January 2020, https://doi.org/10.1144/SP498-2018-145 --- Micropalaeontology and stratigraphical setting of the Cambridge Greensand / Malcolm B. Hart and Lyndsey R. Fox / Geological Society, London, Special Publications, 498, 147-163, 29 November 2019, https://doi.org/10.1144/SP498-2018-144 --- Microfossil assemblages as key to reconstruct sea-level fluctuations, cooling episodes and palaeogeography: The Albian to Maastrichtian of Boreal and Peri-Tethyan Russia / Valentina S. Vishnevskaya and Ludmila F. Kopaevich / Geological Society, London, Special Publications, 498, 165-187, 10 January 2020, https://doi.org/10.1144/SP498-2018-138 --- Cenomanian–Turonian drowning of the Arabian Carbonate Platform, the İnişdere section, Adıyaman, SE Turkey / O. Mulayim, O. I. Yilmaz, B. Sarı, K. Tasli and M. Wagreich / Geological Society, London, Special Publications, 498, 189-210, 3 December 2019, https://doi.org/10.1144/SP498-2018-130 --- The major Late Albian transgressive event recorded in the epeiric platform of the Langshan Formation in central Tibet / Yiwei Xu, Xiumian Hu, Marcelle K. BouDagher-Fadel, Gaoyuan Sun, Wen Lai, Juan Li and Shijie Zhang / Geological Society, London, Special Publications, 498, 211-232, 9 December 2019, https://doi.org/10.1144/SP498-2019-8 --- Cenomanian to Coniacian sea-level changes in the Lower Benue Trough (Nkalagu Area, Nigeria) and the Eastern Dahomey Basin: palaeontological and sedimentological evidence for eustasy and tectonism / Holger Gebhardt, Samuel O. Akande and Olabisi A. Adekeye / Geological Society, London, Special Publications, 498, 233-255, 3 December 2019, https://doi.org/10.1144/SP498-201
    Pages: Online-Ressource (266 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786204745
    URL: https://sp.lyellcollection.org/content/498/1
    Language: English
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  • 2
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    Ecological response to collapse of the biological pump following the mass extinction at the Cretaceous–Paleogene boundary (2017)
    Copernicus
    Details
    Publication Date: 2017-02-27
    Description: It is commonly accepted that the mass extinction associated with the Cretaceous–Paleogene (K–Pg) boundary (∼ 66 Ma) is related to the environmental effects of a large extraterrestrial impact. The biological and oceanographic consequences of the mass extinction are, however, still poorly understood. According to the Living Ocean model, the biological crisis at the K–Pg boundary resulted in a long-term reduction of export productivity in the early Paleocene. Here, we combine organic-walled dinoflagellate cyst (dinocyst) and benthic foraminiferal analyses to provide new insights into changes in the coupling of pelagic and benthic ecosystems. To this end, we perform dinocyst and benthic foraminiferal analyses on the recently discovered Tethyan K–Pg boundary section at Okçular, Turkey, and compare the results with other K–Pg boundary sites in the Tethys. The post-impact dominance of epibenthic morphotypes and an increase of inferred heterotrophic dinocysts in the early Paleocene at Okçular are consistent with published records from other western Tethyan sites. Together, these records indicate that during the early Paleocene more nutrients remained available for the Tethyan planktonic community, whereas benthic communities were deprived of food. Hence, in the post-impact phase the reduction of export productivity likely resulted in enhanced recycling of nutrients in the upper part of the water column, all along the western Tethyan margins.
    Print ISSN: 1726-4170
    Electronic ISSN: 1726-4189
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 3
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    Ecological response to collapse of the biological pump following the mass extinction at the Cretaceous-Paleogene boundary (2016)
    Copernicus
    Details
    Publication Date: 2016-08-03
    Description: It is by now unequivocally shown that the mass extinction associated with the Cretaceous-Paleogene (K-Pg) boundary (~ 66 Ma) is related to the environmental effects of a large extraterrestrial impact. The biological and oceanographic consequences of the mass extinction are, however, still poorly understood. According to the Living Ocean model of D’Hondt et al. (1998), the biological crisis at the K-Pg boundary resulted in a reduction of export productivity in the earliest Paleocene. Here, we combine organic-walled dinoflagellate cyst (dinocyst) and benthic foraminiferal analyses to provide crucial new insight into changes in the coupling of pelagic and benthic ecosystems. To this end, we perform dinocyst and benthic foraminiferal analyses on the recently discovered Tethyan K-Pg boundary section at Okçular, Northwestern Turkey, and compare the results with other K-Pg boundary sites in the Tethys. The post-impact dominance of epibenthic taxa and an increase of inferred heterotrophic dinocysts in the earliest Paleocene at Okçular are consistent with published records from other Tethyan sites. Together, these Tethyan records indicate that during the early Paleocene more nutrients were available for the Tethyan planktonic community, whereas benthic communities were deprived of food. Hence, the post-impact phase the reduction of export productivity likely resulted in enhanced recycling of nutrients in the upper part of the water column, all along the Tethyan shelves.
    Print ISSN: 1810-6277
    Electronic ISSN: 1810-6285
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 4
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    Micropalaeontology, biostratigraphy, and depositional setting of the mid-Cretaceous Derdere Formation at Derik, Mardin, south-eastern Turkey (2020)
    Copernicus
    Details
    Publication Date: 2020-11-05
    Description: The micropalaeontology of the mid-Cretaceous Derdere Formation (Mardin Group) from outcrops close to the town of Derik in south-eastern Turkey is described here. In thin sections from the carbonates that form the majority of this formation, rich and diverse micropalaeontological assemblages are present. These include larger benthonic foraminifera, planktonic foraminifera, and other microfossils, including calcareous algae. Alveolinid foraminifera are particularly common and include a new species – Simplalveolina mardinensis. In contrast to some previous studies, the majority of the section can be demonstrated to be Cenomanian (notably middle Cenomanian) in age with no confirmation of extension into the Albian or Turonian. Deposition took place on a carbonate ramp within a range of discrete deposition settings ranging from peritidal to outer ramp. A notable feature is the small-scale (a few metres) shallowing-up cycles within the inner-ramp facies that may be allocyclic or autocyclic in origin. Three major deepening events are recognised within the succession, characterised by more open marine microfauna and microfacies. These occur at the base of the formation, within the mid-Cenomanian lower part, and towards the top of the formation. These may correlate with three Cenomanian deepening phases seen in other parts of the Arabian Plate.
    Print ISSN: 0262-821X
    Electronic ISSN: 2041-4978
    Topics: Geosciences
    Published by Copernicus on behalf of Micropalaeontological Society.
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