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 A. Vogel and Peter Hofmann and Thomas Wagner},
  journal={Science},
  year={2008},
  volume={319},
  pages={189 - 192}
}
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°C. High-amplitude sea-level changes and positive δ18O excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New δ18O data from the tropical Atlantic show synchronous shifts ∼91.2 million years ago for both the surface and deep ocean that are consistent with an approximately 200,000-year… 
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