global etinction event in benthic foraminifera across the

    The Micropaleontology of Critical Boundaries

    The Paleocene/Eocene boundary event: Inferences from the benthic foraminiferal turnover Laia Alegret & Silvia Ortiz Dept Ciencias de la Tierra, Universidad de Zaragoza, Zaragoza, España

    It is also associated with a large number of extinctions in both marine and terrestrial ecosystems, including within the larger benthic foraminifera Several genera with long global fossil records appear for the last time around this transition event For a long time, it was thought that a sea-level fall due to water becoming locked away as ice.

    Benthic foraminifera across the Cretaceous/Paleogene

    Benthic foraminifera and stable isotopes across the Cretaceous/Paleogene boundary • Lower bathyal setting at Southern Ocean ODP Site 690 • Assemblage fluctuations in Maastrichtian, no forerunner events for extinction • Low (<3%) species extinction and environmental disturbance across.

    Recalibration of the Tethyan shallow-benthic ,

    Recalibration of the Tethyan shallow-benthic zonation across the Paleocene-Eocene boundary : the Egyptian record , dominated by larger benthic foraminifera, to basinal marls with pelagic and deep marine biota , the benthic extinction event in smaller benthic foraminifera and the boundary between planktic foraminifera Biozones P5/E1.

    L Alegret

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    L Alegret

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    Deep-sea Benthic Foraminifera in the SE Atlantic across

    Benthic foraminifera (carbonate and agglutinated) are absent in the carbonate-free PETM clay-layer (Site 1262: 65 kyr; Site1263: 10 kyr) Deep-sea benthic foraminifera suffered extinction and diversity loss at the start of the PETM, as they did globally, with diversity recovering only partially.

    Benthic foraminiferal response to relative sea-level

    Dec 13, 2016· Extinction and survivorship of southern Tethyan benthic foraminifera across the Cretaceous/Paleogene boundary In Biotic Recovery from Mass Extinction Events (ed Hart, ), pp 343 -72 Geological Society of London, Special Publication no 102.

    Correlated terrestrial and marine evidence for global

    Jan 21, 2003· Both plants and foraminifera indicate warming near 660 Ma, a warming peak from ≈658 to 656 Ma, and cooling near 656 Ma, suggesting that these were global climate shifts The warming peak coincides with the immigration of a thermophilic flora, maximum plant diversity, and the poleward range expansion of thermophilic foraminifera.

    Biotic turnover in benthic foraminifera across the

    Biotic turnover in benthic foraminifera across the cretaceous/tertiary boundary at El Kef, Tunisia , Biotic turnover in benthic foraminifera across the cretaceous/tertiary boundary at El Kef, Tunisia: Publication Type: Journal Article: Year of Publication , Although the environmental effects of the K/T boundary event can be inferred from.

    Paleogene larger benthic foraminifera of Tanzania and the

    Larger benthic foraminifera (LBF), one of the most conspicuous and widespread fossil groups during the Eocene, are known to have experienced a rapid global overturning during the EOT, including the extinction of long-ranging families such as the Discocyclinidae, Orbitoclypeidae, Pellatispiridae and a number of species in the Nummulitidae.

    Silvia Ortiz

    Global extinction event in benthic foraminifera across the Paleocene/Eocene boundary at the Dababiya Stratotype section more by Silvia Ortiz Publication Date: 2006 , Global extinction event in benthic foraminifera across the Paleocene/Eocene boundary at.

    Recalibration of the Tethyan shallow-benthic ,

    Recalibration of the Tethyan shallow-benthic zonation across the Paleocene-Eocene boundary : the Egyptian record , dominated by larger benthic foraminifera, to basinal marls with pelagic and deep marine biota , the benthic extinction event in smaller benthic foraminifera and the boundary between planktic foraminifera Biozones P5/E1.

    Planktic foraminiferal turnover across the Paleocene

    We report on the planktic foraminiferal turnover across the P-E transition at DSDP Site 401 in the Bay of Biscay, northeastern Atlantic This section was previously studied by Saint-Marc (1991), and by Pak and Miller (1992) for benthic foraminifera and carbon and oxygen isotopic values of the ben.

    changes and benthic extinctions at the end of the Palaeocene

    now, the extinction event has been studied at insufficient strati-graphic resolution to determine its speed and potential caus During our earlier stable isotope investigationst2'r6 of Antarctic Palaeogene sequences, we discovered a sudden, brief, striking negative isotope excursion in planktonic and benthic.

    "The Paleocene-Eocene Benthic Foraminiferal Extinction and

    In the late Paleocene to early Eocene, deep sea benthic foraminifera suffered their onlyglobal extinction of the last 75 million years and diversity decreased worldwide by 30-50% in a few thousand years At Maud Rise (Weddell Sea, Antarctica; Sites 689 and 690, palaeodepths 1100 m and 1900 m) and Walvis Ridge (Southeastern Atlantic, Sites 525 and 527, palaeodepths 1600 m and 3400 m) post.

    Extinction, Survivorship and Evolution of Planktic

    Extinction, Survivorship and Evolution of Planktic Foraminifera across the Cretaceous/Tertiary Boundary at E1 Kef, Tunisia GERTA KELLER Princeton University, Department of Geological and Geophysical Sciences, Princeton, NJ 08544 (USA) (Revised and accepted November 25, 1987 ) Abstract Keller, G, 1988.

    Benthic foraminifera across the Cretaceous/Paleogene

    Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean (ODP Site 690): Diversity, food and carbonate saturation Laia Alegret a,⁎, Ellen Thomasb,c a Departamento de Ciencias de la Tierra & Instituto Universitario de Investigación en Ciencias Ambientales de Aragón, Universidad de Zaragoza, Spain.

    CiteSeerX — Global change at the Paleocene-Eocene boundary

    CiteSeerX

    Global extinction event in benthic foraminifera across the Paleocene/Eocene boundary at the Dababiya Stratotype section Laia Alegret and Silvia Ortiz Departamento de Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain email: [email protected] ABSTRACT: A global extinction event of deep-sea benthic foraminifera occurred at the Paleocene/Eocene (P/E).

    Atlas of Benthic Foraminifera

    May 02, 2013· An up-to-date atlas of an important fossil and living group, with the Natural History Museum Deep-sea benthic foraminifera have played a central role in biostratigraphic, paleoecological, and paleoceanographical research for over a century.

    Extinction of larger benthic foraminifera at the Eocene

    These records show that all of the larger benthic foraminifera extinction events occur close to the Eocene/Oligocene boundary as recognised by the extinction of the planktonic foraminiferal Family Hantkeninidae, rather than at the prominent oxygen isotope excursion in the lower Oligocene that signifies maximum ice growth and global sea-level fall.

    Environmental perturbation in the southern Tethys across

    into each other (Speijer, 1995) The benthic extinction event occurred so rapidly that it is difficult to compare the immediate post-extinction faunas on a global scale, since the extinction level often coincides with an unconformity and/or with carbonate-dissolution inter-vals with poor recovery of calcareous foraminifera in.

    Paleogene larger benthic foraminifera of Tanzania and the

    Larger benthic foraminifera (LBF), one of the most conspicuous and widespread fossil groups during the Eocene, are known to have experienced a rapid global overturning during the EOT, including the extinction of long-ranging families such as the Discocyclinidae, Orbitoclypeidae, Pellatispiridae and a number of species in the Nummulitidae.