Browse by author
Lookup NU author(s): Dr Britta Beckmann,
Professor Thomas Wagner
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
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 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.
Author(s): Bornemann A, Norris RD, Friedrich O, Beckmann B, Schouten S, Damsté JSS, Vogel J, Hofmann P, Wagner T
Publication type: Article
Publication status: Published
ISSN (print): 0036-8075
ISSN (electronic): 1095-9203
Publisher: American Association for the Advancement of Science
Altmetrics provided by Altmetric