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      Intermittent euxinia in the high-latitude James Ross Basin during the latest Cretaceous and earliest Paleocene

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      Journal: Palaeogeography, Palaeoclimatology, Palaeoecology
      Publisher: Elsevier BV

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          The Phanerozoic record of global sea-level change.

          K. Miller (2005)
          We review Phanerozoic sea-level changes [543 million years ago (Ma) to the present] on various time scales and present a new sea-level record for the past 100 million years (My). Long-term sea level peaked at 100 +/- 50 meters during the Cretaceous, implying that ocean-crust production rates were much lower than previously inferred. Sea level mirrors oxygen isotope variations, reflecting ice-volume change on the 10(4)- to 10(6)-year scale, but a link between oxygen isotope and sea level on the 10(7)-year scale must be due to temperature changes that we attribute to tectonically controlled carbon dioxide variations. Sea-level change has influenced phytoplankton evolution, ocean chemistry, and the loci of carbonate, organic carbon, and siliciclastic sediment burial. Over the past 100 My, sea-level changes reflect global climate evolution from a time of ephemeral Antarctic ice sheets (100 to 33 Ma), through a time of large ice sheets primarily in Antarctica (33 to 2.5 Ma), to a world with large Antarctic and large, variable Northern Hemisphere ice sheets (2.5 Ma to the present).
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            The Chicxulub asteroid impact and mass extinction at the Cretaceous-Paleogene boundary.

            Peter Z. Schulte, Laia Alegret, Ignacio Arenillas … (2010)
            The Cretaceous-Paleogene boundary approximately 65.5 million years ago marks one of the three largest mass extinctions in the past 500 million years. The extinction event coincided with a large asteroid impact at Chicxulub, Mexico, and occurred within the time of Deccan flood basalt volcanism in India. Here, we synthesize records of the global stratigraphy across this boundary to assess the proposed causes of the mass extinction. Notably, a single ejecta-rich deposit compositionally linked to the Chicxulub impact is globally distributed at the Cretaceous-Paleogene boundary. The temporal match between the ejecta layer and the onset of the extinctions and the agreement of ecological patterns in the fossil record with modeled environmental perturbations (for example, darkness and cooling) lead us to conclude that the Chicxulub impact triggered the mass extinction.
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              Thresholds of hypoxia for marine biodiversity.

              Raquel Vaquer-Sunyer, Carlos M. Duarte (2008)
              Hypoxia is a mounting problem affecting the world's coastal waters, with severe consequences for marine life, including death and catastrophic changes. Hypoxia is forecast to increase owing to the combined effects of the continued spread of coastal eutrophication and global warming. A broad comparative analysis across a range of contrasting marine benthic organisms showed that hypoxia thresholds vary greatly across marine benthic organisms and that the conventional definition of 2 mg O(2)/liter to designate waters as hypoxic is below the empirical sublethal and lethal O(2) thresholds for half of the species tested. These results imply that the number and area of coastal ecosystems affected by hypoxia and the future extent of hypoxia impacts on marine life have been generally underestimated.
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                Author and article information

                Journal
                Title: Palaeogeography, Palaeoclimatology, Palaeoecology
                Abbreviated Title: Palaeogeography, Palaeoclimatology, Palaeoecology
                Publisher: Elsevier BV
                ISSN (Print): 00310182
                Publication date Created: July 2017
                Publication date (Print): July 2017
                Volume: 477
                Issue:
                Pages: 40-54
                Article
                DOI: 10.1016/j.palaeo.2017.04.013
                SO-VID: 646a082d-e614-411c-b52f-db105efd1cac
                Copyright © © 2017
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