Isotopic evidence for glaciation during the Cretaceous supergreenhouse.

@article{Bornemann2008IsotopicEF,
  title={Isotopic evidence for glaciation during the Cretaceous supergreenhouse.},
  author={Andr{\'e} Bornemann and Richard D. Norris and Oliver Friedrich and Britta Beckmann and Stefan Schouten and Jaap S. Sinninghe Damst{\'e} and Jennifer Vogel and Peter Hofmann and Thomas Wagner},
  journal={Science},
  year={2008},
  volume={319 5860},
  pages={
          189-92
        }
}
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… CONTINUE READING

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