Stratigraical studies on the Upper Cretaceous - Lower Eocenerocks in Central Eastern Desert, Egypt | ||||
| Delta Journal of Science | ||||
| Article 6, Volume 37, Issue 2, December 2016, Page 155-189 PDF (3.08 MB) | ||||
| Document Type: Research and Reference | ||||
| DOI: 10.21608/djs.2016.139933 | ||||
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| Authors | ||||
| H Khalil; M. S. Fathy; A. L Abdeldayem; O. A. Ghobara | ||||
| Geology Department, Faculty of Science, Tanta University, Tanta, Egypt | ||||
| Abstract | ||||
| An attempt has been made to construct the lithostratigraphic and biostratigraphic characters of the Upper Cretaceous-Lower Eocene rocks exposed at Gebel Duwi and Gebel Atshan sections, central Eastern Desert. Lithostratigraphically, the studied succession arerepresented by four rock units arranged from base to top as: Dakhla, Tarawan, Esna and Thebes formations. Detailed study of planktonic foraminifera and calcareous nannofossils has led to the recognition of forty five calcareous nannofossil and thirty one planktonic foraminiferal species. Twelve planktonic foraminiferal biozones, Racemiguembelina fructicosa Subzone (CF4), Pseudoguembelina hariaensis Subzone (CF3), Pseudoguembelina palpebra Subzone (CF2), Parasubbotina pseudobulloides Subzone (P1a), Praemurica uncinata Zone (P2), Morozovella angulata Zone (P3, subdivided intoIgorina pusilla Subzone P3a and Igorina albeari Subzone P3b), Globanomalina pseudomenardii Zone (P4), Morozovella velascoensis Zone (P5), Acarinina sibaiyaensis Zone (E1), Pseudohastigerina wilcoxensis-Morozovella velascoensis Zone (E2), Morozovella marginodentata Zone (E3) and Morozovella Formosa Zone (E4) have been recognized as well as twelve calcareous nannofossil biozones; Micula murus Subzone (CC25c), Micula prinsii Subzone (CC26b), Cruciplacolithus tenuis Zone (NP2), Ellipsolithus macellus Zone (NP4), Fasciculithus tympaniformis Zone (NP5), Heliolithus kleinpellii Zone (NP6), Discoastermohleri Zone (NP7/ NP8), Discoaster multiradiatus Zone (NP9), Tribrachiatus contortus Zone (NP10) and Discoaster binodosus Zone (NP11). The Cretaceous/Paleogene (K/Pg) boundary is marked by the absence of nannoplankton NP1 Zone and the planktonic (P0 and P1 Zones). The K/Pg boundary is located at the top of CC26b. This boundary lies in the middle part of the Dakhla Formation. The Danian/Selandian boundary can be placed inthe uppermost part of Zone NP4 and nearly at the top of P3a Subzone in the upper part of the Dakhla Formation. The Selandian/Thanetian boundary can be drawn at NP6/ NP7/8 zonal boundary, and the upper part of P4 Subzone within the Esna Formation. The Paleocene/Eocene (P/E) | ||||
| Keywords | ||||
| Gebel Duwi; Paleocene/Eocene; Foraminifera; Calcareous Nanofossils; Biostratigraphy | ||||
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