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      Improving the interpretability of air-gun seismic reflection data using deterministic filters: A case history from offshore Cape Leeuwin, southwest Australia

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      GEOPHYSICS
      Society of Exploration Geophysicists

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          Exploration Seismology

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            Adaptive surface‐related multiple elimination

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              Isotopic evidence for glaciation during the Cretaceous supergreenhouse.

              The Turonian (93.5 to 89.3 million years ago) was one of the warmest periods of the Phanerozoic eon, with tropical sea surface temperatures over 35 degrees C. High-amplitude sea-level changes and positive delta18O excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New delta18O data from the tropical Atlantic show synchronous shifts approximately 91.2 million years ago for both the surface and deep ocean that are consistent with an approximately 200,000-year period of glaciation, with ice sheets of about half the size of the modern Antarctic ice cap. Even the prevailing supergreenhouse climate was not a barrier to the formation of large ice sheets, calling into question the common assumption that the poles were always ice-free during past periods of intense global warming.
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                Author and article information

                Journal
                GEOPHYSICS
                GEOPHYSICS
                Society of Exploration Geophysicists
                0016-8033
                1942-2156
                May 2011
                May 2011
                : 76
                : 3
                : B113-B125
                Article
                10.1190/1.3554396
                9f3965af-530f-493a-b70e-2f430bdff733
                © 2011
                History

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