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      Glendonites throughout the Phanerozoic

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          Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs.

          Climate models with increased levels of carbon dioxide predict that global warming causes heating in the tropics, but investigations of ancient climates based on palaeodata have generally indicated cool tropical temperatures during supposed greenhouse episodes. For example, in the Late Cretaceous and Eocene epochs there is abundant geological evidence for warm, mostly ice-free poles, but tropical sea surface temperatures are generally estimated to be only 15-23 degrees C, based on oxygen isotope palaeothermometry of surface-dwelling planktonic foraminifer shells. Here we question the validity of most such data on the grounds of poor preservation and diagenetic alteration. We present new data from exceptionally well preserved foraminifer shells extracted from impermeable clay-rich sediments, which indicate that for the intervals studied, tropical sea surface temperatures were at least 28-32 degrees C. These warm temperatures are more in line with our understanding of the geographical distributions of temperature-sensitive fossil organisms and the results of climate models with increased CO2 levels.
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            Global plate boundary evolution and kinematics since the late Paleozoic

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              GPlates: Building a Virtual Earth Through Deep Time

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                Author and article information

                Journal
                Earth-Science Reviews
                Earth-Science Reviews
                Elsevier BV
                00128252
                June 2023
                June 2023
                : 241
                : 104430
                Article
                10.1016/j.earscirev.2023.104430
                849ea63a-950a-42ba-8f0d-8b256418d565
                © 2023

                https://www.elsevier.com/tdm/userlicense/1.0/

                https://doi.org/10.15223/policy-017

                https://doi.org/10.15223/policy-037

                https://doi.org/10.15223/policy-012

                https://doi.org/10.15223/policy-029

                https://doi.org/10.15223/policy-004

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