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The Qreiya Section at Gebel Abu Had: Lithostratigraphy, clay mineralogy, geochemistry and biostratigraphy

¹ c/o British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
² Department of Geology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey, USA
³ Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
⁴ Faculté Polytechnique de Mons, rue de Houdain 9, B-7000 Mons, Belgium 08554, USA
⁵ Department of Geology, University of Assiut, Assiut, Egypt, email: robertknox{at}rknox.fsnet.co.uk

Calcareous nannofossil and planktonic foramininferal assemblages demonstrate that the succession at Qreiya provides a virtually complete stratigraphic reference section through the Esna Shale Formation.

A detailed study of the Dababiya Quarry Beds has revealed distinct stratigraphic trends in both mineralogy and geochemistry, similar to those reported from Dababiya Quarry itself. In particular, the organic carbon isotope analysis has revealed a pronounced negative carbon isotope excursion of comparable magnitude to that recorded from Dababiya. Calcareous nannoplankton (Rhomboaster spp.-Discoaster araneus association) and planktonic foraminiferal occurrences (the so-called excursion taxa) allow unambiguous determination of this isotopic excursion as the Carbon Isotope Excursion (CIE) identified globally at the base of Eocene successions.

Preliminary petrological analysis of mudstones within the Dababiya Quarry Beds has revealed a finely granular texture, possibly representing fecal pellets. This texture indicates that the sea-bed sediment may have been mobile, and subject to redistribution by gentle, wave-induced currents.

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