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Late Maastrichtian Calcareous Nannofossil Biostratigraphy and Paleoecology of the Tamera Well, Siwa Area, Western Desert, Egypt

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International Journal of Geosciences 2013年第6期4卷 985-992页

作者： esam zahran Geology Department Faculty of Science Damanhour University Damanhour Egypt

The upper Cretaceous interval of the Khoman Formation in the Tamera well, Siwa area, Western Desert of Egypt was studied for the first time on the basis of calcareous nannofossils. Twenty-one nannofossil species were identified from this interval. The study interval includes the Micula murus Zone, which is precisely dated as Late Maastrichtian age. The Micula murus Zone includes besides the marker species: Micula decussata, Watznaueria barnesae, Arkhangelsktella cymbiformis and relatively rare occurrences of Eiffellithus turrisieffellii, Cribrosphaerella ehrenbergii, Thoracosphaera operculata and Braarudosphaera bigelowii. The latest Maastrichtian Micula prinsi Zone is missing, and an unconformity surface is detected in this well. The high abundance of Micula decussata is indicative of very low surface productivity and high-stress environmental conditions. Several nannofossil species are recognized as cool water indicators such as Micula decussata, and Arkhangelsktella cymbiformis.

关键词： Formation Nannofossils Micula Prins Late Maastrichtian

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Calcareous Nannofossil Biostratigraphy and Stage Boundaries of the Santonian-Eocene Successions in Wadi El Mizeira Northeastern Sinai, Egypt

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International Journal of Geosciences 2014年第4期5卷 432-449页

作者： Hamza Khalil esam zahran Geology Department Faculty of Science Damanhour University Damanhour Egypt Geology Department Faculty of Science Tanta University Tanta Egypt

The stratigraphic successions exposed in Wadi El Mizeira have been dated through the analysis of the calcareous nannofossil assemblages. The results of this study indicate that the successions comprise the Santonian-Late Maastrichtian (Sudr Formation), the Paleocene (Esna Formation) and the Early Eocene (Thebes Formation). The following biozones were recognized: Late Santonian, CC16 Zone;Late Santonian/Early Campanian, CC17 Zone;Early Campanian, Aspidolithus parcus Zone (CC18) Zone;Late Maastrichtian, CC25c Zone;Early Paleocene (Late Danian), NP3 Zone and NP4 Zone;Late Paleocene (Thanethian-Selandian), NP5 Zone;Early Eocene, NP9b Zone, NP10a Zone, NP11 Zone, NP12 Zone and NP14 Zone. Several stratigraphic hiatus were recorded in the studied interval including the absence of Cretaceous nannofossil Zones CC19 to CC25b and CC26 as well as the early Paleocene Zones NP1 and NP2 and probably the basal part of Zone NP3, in addition to the absence of the Zones NP6 and NP7/8. These hiatus may be attributed to environmental conditions, structural activity and/or post depositional processes. This work represents the first attempt to evaluate the nannofossil taxa of the Wadi El Mizeira, Northeastern Sinai.

关键词： Calcareous Nannofossil Biostratigraphy Santonian Eocene Sinai Egypt

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