Research Article| June 01, 2005 Turnover of larger foraminifera during the Paleocene-Eocene Thermal Maximum and paleoclimatic control on the evolution of platform ecosystems C. Scheibner; C. Scheibner 1Department of Geosciences, Bremen University, P.O. Box 330440, 28334 Bremen, Germany Search for other works by this author on: GSW Google Scholar R.P. Speijer; R.P. Speijer 2Department of Geography and Geology, Katholieke Universiteit Leuven, 3000 Leuven, Belgium Search for other works by this author on: GSW Google Scholar A.M. Marzouk A.M. Marzouk 3Geology Department, Faculty of Science, Tanta University, 31527 Tanta, Egypt Search for other works by this author on: GSW Google Scholar Geology (2005) 33 (6): 493–496. https://doi.org/10.1130/G21237.1 Article history received: 27 Sep 2004 rev-recd: 09 Feb 2005 accepted: 11 Feb 2005 first online: 03 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 C. Scheibner, R.P. Speijer, A.M. Marzouk; Turnover of larger foraminifera during the Paleocene-Eocene Thermal Maximum and paleoclimatic control on the evolution of platform ecosystems. Geology 2005;; 33 (6): 493–496. doi: https://doi.org/10.1130/G21237.1 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 larger-foraminifera turnover (LFT) during the Paleocene-Eocene transition constitutes an important step in Paleogene larger-foraminifera evolution, involving a rapid increase in species diversity, shell size, and adult dimorphism. A platform-to-basin transect in Egypt provides new data on timing and causal mechanisms through correlation with planktic biozonations and through integration with regional paleoenvironmental data. The LFT coincides with the boundary between shallow benthic biozones SBZ4 and SBZ5 and closely correlates with the Paleocene-Eocene Thermal Maximum (PETM). Enhanced oligotrophy from the late Paleocene onward favored the diversification of K-strategist larger foraminifera. We suggest that a short-term eutrophication during the PETM led to a temporary decline of extreme K-strategist larger-foraminifera species, providing opportunities for new taxa with different ecological strategies to develop. During post-PETM oligotrophic conditions, these new taxa were able to evolve rapidly and soon dominated early Eocene larger-foraminifera assemblages, whereas many Paleocene taxa gradually disappeared. The success of larger foraminifera during the early Paleogene appears climatically controlled. Because of the vulnerability of corals to high surface-water temperatures, the late Paleocene to early Eocene global warming may have favored larger foraminifera at the expense of corals as the main carbonate-producing component on carbonate platforms at lower latitudes. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.