Abstract
The present work deals with the foraminiferal investigations and analyses of the Danian-Selandian (D-S) succession at Naqb El-Rufuf and Umm El-Ghanayim sections in the Kharga Oasis. Five planktonic foraminiferal zones and subzones (P1c, P2, P3a, P3b, and P4a) were recognized within the studied sections. The D/S stage boundary is characterized by a faunal break at the P3/P4 zonal boundary owing to completely or partially absence of the P3b subzone. This hiatus reveals the dual signature of both the eustatic sea-level changes and the regional tectonic event of the Syrian Arc System. The studied interval is subdivided into three transgressive-regressive sequences bounded by three sequence boundaries at the Cretaceous-Paleogene (K/Pg.) boundary, the boundary between P3a/P3b subzones and the D/S boundary, respectively. The D/S transition is associated with substantial changes in the structure and composition of the foraminiferal assemblages point to extensive paleoenvironmental turnover. The latest Danian sediments were deposited under deep inner-shallow middle neritic environments with oxygen-depleted bottom water conditions and increased trophic level, where an outer neritic environment with meso-oligotrophic and well-oxygenated bottom water conditions prevailed during the deposition of the Selandian deposits.
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Many thanks extend to the anonymous reviewers for constructive criticisms and valuable comments that greatly improved the manuscript. Prof. Abdullah M. Al-Amri Arabian Journal of Geosciences Editor-in-Chief and the Guest Editor are thanked for the editorial handling and useful comments.
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Appendix 1
Appendix 1
Benthic species list
1. Alabamina midwayensis Brotzen, 1948 | |
2. Ammobaculites expansus Plummer, 1933 | |
3. Angulogavelinella avnimelechi (Reiss, 1952) | |
4. Anomalinoides affinis (Hantken, 1875) | |
5. Anomalinoides praeacutus (Vasilenko, 1950) | |
6. Anomalinoides rubiginosus (Cushman, 1926) | |
7. Anomalinoides susanaensis (Browning, 1959) | |
8. Anomalinoides zitteli (LeRoy, 1953) | |
9. Bulimina midwayensis (Cushman and Parker, 1936) | |
10. Bulimina paleocenica Brotzen, 1948 | |
11. Bulimina strobila Marie, 1941 | |
12. Cibicides farafraensis LeRoy, 1953 | |
13. Cibicidoides alleni (Plummer, 1926) | |
14. Cibicidoides hyphalus (Fisher, 1969) | |
15. Cibicidoides libycus (LeRoy, 1953) | |
16. Cibicidoides pharaonis (LeRoy, 1953) | |
17. Cibicidoides proprius (Brotzen, 1948) | |
18. Cibicidoides pseudoacutus (Nakkady, 1950) | |
19. Cibicidoides pseudoperlucidus (Bykova, 1954) | |
20. Cribrostomoides trinitatensis Cushman and Jarvis, 1928 | |
21. Frondicularia spp. | |
22. Gaudryina spp. | |
23. Gavelinella danica (Brotzen, 1940) | |
24. Gavelinella lellingensis Brotzen, 1948 | |
25. Gyroidinoides beisseli (White, 1928) | |
26. Gyroidinoides girardanus (Reuss, 1851) | |
27. Haplophragmoides excavata Cushman and Waters, 1927 | |
28. Karrerulina conversa (Grzybowski, 1901) | |
29. Laevidentalina colei (Cushman and Dusenbury, 1934) | |
30. Ornamented lenticulinids | |
31. Smooth lenticulinids | |
32. Loxostomoides applinae (Plummer, 1926) | |
33. Marginulina carri LeRoy, 1953 | |
34. Marginulinopsis tuberculata (Plummer, 1926) | |
35. Neoeponides duwi (Nakkady, 1950) | |
36. Neoflabellina jarvisi (Cushman, 1935) | |
37. Oridorsalis plummerae (Cushman, 1948) | |
38. Orthokarstenia higazi (Nakkady, 1955) | |
39. Osangularia plummerae Brotzen, 1940 | |
40. Palmula spp. | |
41. Praeglobobulimina quadrata (Plummer, 1926) | |
42. Pseudoclavulina spp. | |
43. Pullenia jarvisi Cushman, 1936 | |
44. Pulsiphonina prima (Plummer, 1926) | |
45. Pygmaeoseistron spp. | |
46. Pyramidulina spp. | |
47. Reussoolina apiculata (Reuss, 1850) | |
48. Siphogeneroides eleganta (Plummer, 1926) | |
49. Spiroplectinella spp. | |
50. Stilostomella spp. | |
51. Textularia schwageri LeRoy, 1953 | |
52. Trifarina esnaensis LeRoy, 1953 | |
53. Trochammina spp. | |
54. Turrilina brevispira Ten Dam, 1944 | |
55. Valvalabamina depressa (Alth, 1850) | |
56. Valvalabamina planulata (Cushman and Renz, 1941) | |
57. Valvulineria esnehensis Nakkady, 1950 | |
58. Vulvulina colei Cushman, 1932 |
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Hewaidy, A.G.A., Farouk, S. & Bazeen, Y.S. Foraminiferal biostratigraphy and paleoenvironments of the Danian-Selandian succession at the Kharga Oasis, Western Desert, Egypt. Arab J Geosci 12, 133 (2019). https://doi.org/10.1007/s12517-019-4229-z
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DOI: https://doi.org/10.1007/s12517-019-4229-z