Research Article| July 01, 1996 The latest Paleocene crisis in the deep sea: Ostracode succession at Maud Rise, Southern Ocean P. Lewis Steineck; P. Lewis Steineck 1Division of Natural Sciences, Purchase College, Purchase, New York 10577 Search for other works by this author on: GSW Google Scholar E. Thomas E. Thomas 2Center for the Study of Global Change, Yale University, New Haven, Connecticut 06529 Search for other works by this author on: GSW Google Scholar Geology (1996) 24 (7): 583–586. https://doi.org/10.1130/0091-7613(1996)024<0583:TLPCIT>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation P. Lewis Steineck, E. Thomas; The latest Paleocene crisis in the deep sea: Ostracode succession at Maud Rise, Southern Ocean. Geology 1996;; 24 (7): 583–586. doi: https://doi.org/10.1130/0091-7613(1996)024<0583:TLPCIT>2.3.CO;2 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 During the late Paleocene thermal maximum (ca. 55.50 Ma) mid-bathyal ostracodes at Maud Rise in the Southern Ocean (Ocean Drilling Program Site 689) underwent a sudden, dramatic turnover synchronous with a global extinction in deep-sea benthic foraminifers and with large-scale, short-lived negative excursions in the stable isotope record of foraminiferal calcite. A previously stable and long-lived ostracode assemblage, dominated by heavily calcified, chiefly epifaunal taxa, was replaced within ∼ 10 k.y. by a taxonomically novel association of small, thin-walled opportunistic and generalist forms that persisted for ∼ 25–40 k.y. Thereafter, ostracode faunas recovered and common bathyal forms returned, although species were smaller and/or less-heavily calcified than before the turnover. The complex fabric of change in ostracode shell morphology and assemblage composition and structure reflects both long-term and sudden perturbations in seawater chemistry at this site. Ostracode data are in agreement with the hypothesis that the latest Paleocene extinctions in the deep sea were caused by a change in the dominant source area of intermediate water mass from high altitudes to the subtropics. These data also suggest that warm saline waters persisted at Maud Rise for the next 100 k.y. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.