Summer temperatures of late Eocene to early Oligocene freshwaters

Abstract

Research Article| March 01, 2005 Summer temperatures of late Eocene to early Oligocene freshwaters Stephen T. Grimes; Stephen T. Grimes 1Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Search for other works by this author on: GSW Google Scholar Jerry J. Hooker; Jerry J. Hooker 2Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK Search for other works by this author on: GSW Google Scholar Margaret E. Collinson; Margaret E. Collinson 3Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Search for other works by this author on: GSW Google Scholar David P. Mattey David P. Mattey 3Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Stephen T. Grimes 1Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Jerry J. Hooker 2Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK Margaret E. Collinson 3Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK David P. Mattey 3Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Publisher: Geological Society of America Received: 29 Jul 2004 Revision Received: 17 Nov 2004 Accepted: 18 Nov 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2005) 33 (3): 189–192. https://doi.org/10.1130/G21019.1 Article history Received: 29 Jul 2004 Revision Received: 17 Nov 2004 Accepted: 18 Nov 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Stephen T. Grimes, Jerry J. Hooker, Margaret E. Collinson, David P. Mattey; Summer temperatures of late Eocene to early Oligocene freshwaters. Geology 2005;; 33 (3): 189–192. doi: https://doi.org/10.1130/G21019.1 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 marine foraminiferal isotope record displays a positive δ18O shift early in the Oligocene, which has been identified as the onset of the Antarctic Oi-1 glaciation. Reported here are the first oxygen isotope–derived summer paleotemperatures for continental freshwater in the Northern Hemisphere (Hampshire Basin, Isle of Wight, UK) leading up to and across this event. These paleotemperatures are derived from multiple paleoproxies (rodent tooth enamel, gastropod shells, charophyte gyrogonites, and fish otoliths) and are independent of freshwater evaporation effects and changes in ice volume. We conclude that a fluctuating mesothermal climate existed, but that there was no significant decrease in summer temperatures across the Oi-1 glaciation. This result is concordant with several other studies in suggesting that the majority of the isotopic shift in the marine realm across the Oi-1 glaciation is linked to changes in Antarctic ice volume and not to global temperature change. Our new approach has allowed us to derive numerical values for summer temperatures as well as to reconstruct relative temperature change across this key interval of the Eocene-Oligocene transition. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.