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GEOREF RECORD

Global extinction event in the benthic Foraminifera across the Paleocene/Eocene boundary at the Dababiya stratotype section

Laia Alegret and Silvia Ortiz
Global extinction event in the benthic Foraminifera across the Paleocene/Eocene boundary at the Dababiya stratotype section
Micropaleontology (2006) 52 (5): 433-447

Abstract

A global extinction event of deep-sea benthic foraminifera occurred at the Paleocene/Eocene (P/E) boundary, coeval with a period of rapid global warming (Initial Eocene Thermal Maximum; IETM) and a negative excursion in marine and terrestrial delta (super 13) C values (Carbon Isotope Excursion; CIE). Benthic foraminifera from marginal and epicontinental basins show lesser extinctions and/or temporary assemblage changes. Detailed taxonomical and quantitative analysis of the benthic foraminiferal assemblages and of the paleoenvironmental turnover across the P/E boundary in the outer neritic Dababiya section (Egypt), the Global stratotype Section and Point (GSSP) for the P/E boundary, is of great importance for correlation with other P/E boundary sites. We illustrate the 46 most representative benthic foraminiferal taxa (belonging to 27 genera) in order to compare the taxonomy of species described in Egypt with that of species described from other sections worldwide. Angulogavelinella avnimelechi had its uppermost occurrence at the base of the CIE, and its extinction may be correlated to the main phase of extinction of benthic foraminifera (Benthic Foraminiferal Extinction Event, BEE) in the deep sea. At the same level, the species richness and diversity decreased, and the relative abundance of non-calcareous agglutinated foraminifera increased dramatically, probably related to intense dissolution as seen in the lithology. However, dissolution of carbonate was not complete through the whole CIE at Dababiya, and thus may not have been the only cause of the foraminiferal turnover.


ISSN: 0026-2803
Coden: MCPLAI
Serial Title: Micropaleontology
Serial Volume: 52
Serial Issue: 5
Title: Global extinction event in the benthic Foraminifera across the Paleocene/Eocene boundary at the Dababiya stratotype section
Affiliation: Universidad de Zaragoza, Departamento de Ciencias de la Tierra, Saragossa, Spain
Pages: 433-447
Published: 2006
Text Language: English
Publisher: American Museum of Natural History, New York, NY, United States
References: 50
Accession Number: 2007-087344
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 plates, sketch map
N06°00'00" - N06°00'00", E16°00'00" - E16°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200719
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