Abstract
Research Article| December 01, 2013 Late Cretaceous winter sea ice in Antarctica? Vanessa C. Bowman; Vanessa C. Bowman 1School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK *Current address: British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK; Email: Vanessa.Bowman@bas.ac.uk. Search for other works by this author on: GSW Google Scholar Jane E. Francis; Jane E. Francis 1School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK *Current address: British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK; Email: Vanessa.Bowman@bas.ac.uk. Search for other works by this author on: GSW Google Scholar James B. Riding James B. Riding 2British Geological Survey, Keyworth, Nottingham NG12 5GG, UK Search for other works by this author on: GSW Google Scholar Geology (2013) 41 (12): 1227–1230. https://doi.org/10.1130/G34891.1 Article history received: 02 Jul 2013 rev-recd: 02 Sep 2013 accepted: 04 Sep 2013 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Vanessa C. Bowman, Jane E. Francis, James B. Riding; Late Cretaceous winter sea ice in Antarctica?. Geology 2013;; 41 (12): 1227–1230. doi: https://doi.org/10.1130/G34891.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Late Cretaceous is considered to have been a time of greenhouse climates, although evidence from Maastrichtian sediments for rapid and significant sea-level changes suggests that ice sheets were growing and decaying on Antarctica at that time. There is no direct geological evidence for glaciation, but we present palynomorph records from Seymour Island, Antarctica, that may suggest Maastrichtian sea ice. The dinoflagellate cyst Impletosphaeridium clavus is dominant. We propose that its profusion may signify the accumulation of resting cysts from dinoflagellate blooms related to winter sea ice decay. Prior to the Cretaceous-Paleogene transition, I. clavus decreased dramatically in abundance; we link this with climate warming. Terrestrial conditions inferred from pollen and spore data are consistent with our climate interpretations based on I. clavus together with δ18O values from macrofossils. These data and our interpretation support the presence of ephemeral ice sheets on Antarctica during the latest Cretaceous, highlighting the extreme sensitivity of this region to global climate change. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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