Evolución de las asociaciones de foraminíferos durante el tránsito Paleoceno-Eoceno en el corte estratotípico de Dababiya (Egipto)

• S. Ortiz ^[1] ; L. Alegret ^[1] ; I. Arenillas ^[1] ; E. Molina ^[1]
  1. [1] Universidad de Zaragoza

     Universidad de Zaragoza

     Zaragoza, España

     
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 2, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España), págs. 295-297
• Idioma: español
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• Resumen

  • The aim of our study was to reconstruct the paleoenvironmental evolution through the PaleoceneEocene transition in the outer neritic Dababiya section (Egypt) by means of foraminifera. The CSSP of the P/E boundary is situated in the Esna Shale Formation at Dababiya Quarry. The Carbon Isotope Excursion (CIE), which is recorded at Dababiya Quarry Beds 1 to 5, coincides with a major turnover in foraminiferal assemblages. The studied interval encompasses the middle part of the Morozovella velascoensis (P5) planktic foraminiferal Zone. Upper Paleocene benthic foraminiferal assemblages are diverse, and they contain 30-40% of agglutinated foraminifera, whereas assemblages from the uppermost Paleocene and lowermost Eocene are dominated by agglutinated, opportunistic taxa that tolerate low oxygen conditions as well as changes in the food supply.

    Towards the upper part of the CIE inverval the low diversity Eocene benthic assemblages are dominated by Lenticulina and nodosariids; diversity increases above the Dababiya Quarry Beds, although it shows several fluctuations.