Journal
SCIENCE
Volume 319, Issue 5860, Pages 189-192Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1148777
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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 delta O-18 excursions in marine limestones suggest that glaciation events may have punctuated this episode of extreme warmth. New delta O-18 data from the tropical Atlantic show synchronous shifts similar to 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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