Paleoenvironmental changes in the Paleocene sequence of Dineigil area, south western Desert (Egypt): Foraminifera and calcareous nannofossils record.
Youssef, Mohamed . 2014
Seventy three rock samples were extracted from the Paleocene interval (43 meters) in Dineigil Area. Three biozones (P3, P4, and P5) and two subzones (P3a and P3b) of planktonic foraminifera were recorded. The calcareous nannofossils were moderately preserved and allowed to recognize four biozones from base to top as follow (NP4, NP5, NP6, and NP7/8). The upper boundaries of P5 and NP7/8 are not recognized. The D/S boundary was delineate at the lower part of the Subzone P3b and coincides with the LO of Fasciculithus janii, F. billii and F. ulii. The lowest occurrence of Discoaster mohleri delineates the Selandian/Thanetian boundary. The benthic foraminiferal assemblage is qualitatively and quantitatively studied to investigate the paleoenvironments of the studied interval. The assemblages are typically dominated by the Midway-type fauna (e.g., Cibicidoides alleni, C. succeedens, Osangularia plummerae, Bulimina midwayensis, Siphogenerinoides eleganta,and Loxostomoides applinae. The deeper dwelling taxa of Paleocene were absent. Based on these data the Paleocene sediments from Dineigil Area was inferred to be deposited in inner to middle neritic environment (50-100 m depth). Anomalous occurrence of Neoeponides duwi (N. duwi event) associated with common occurrence of Siphogenerinoides eleganta, costate lenticulinids, and Stainforthia spp. Neoeponides duwi dominated the benthic foraminiferal assemblages in the latest Danian. This event coincides with a rapid sea-level fall and suggested that Neoeponides duwi thrives in restricted environments characterized by oxygen deficiency and rich food resources.
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