Calcareous nannofossil biostratigraphy and bioevents across the Ypresian/Lutetian boundary in Egypt and Jordan. (May 2023)

• Record Type: Journal Article
• Authors: Alhejoj, Ikhlas; Faris, M.; Ahmad, F.; Farouk, S.; Sreepat, J.; Musa, G.; Shama, M.
• Is Part Of: Journal of African earth sciences. Volume 201(2023)
• Publication Date: 2023-05
• Subjects: Calcareous nannofossils -- Ypresian/Lutetian boundary -- Biostratigraphy -- Bioevents -- Egypt -- Jordan; Earth sciences -- Africa -- Periodicals; Earth sciences -- Middle East -- Periodicals; Geology -- Africa -- Periodicals; Geology -- Middle East -- Periodicals; Sciences de la terre -- Afrique -- Périodiques; Sciences de la terre -- Moyen-Orient -- Périodiques; Géologie -- Afrique -- Périodiques; Géologie -- Moyen-Orient -- Périodiques; Earth sciences; Geology; Africa; Middle East; Periodicals; Electronic journals; 556.05
• DOI: 10.1016/j.jafrearsci.2023.104881
• Languages: English
• ISSNs: 1464-343X

Abstract

Abstract: The Ypresian/Lutetian boundary duration calcareous nannofossil biostratigraphy and bioevents from three sections, two from Sinai, Egypt (Wadi Ferian and El Mishatii; west-central and north-east Sinai, respectively) and one from Jordan (Outherite), are presented for the first time. Fifty-three calcareous nannofossil species are identified from 86 samples, spanning the calcareous nannofossil Zone NP14 (= Zone CP12; early‒middle Eocene). In the present study, the early/middle Eocene (Ypresian/Lutetian) boundary is defined by the Lowest Occurrence (LO) of Blackites inflatus, positioned at the base of NP14b/CP12b zones. The LO of B. inflatus is slightly above the LO of Turborotalia frontosa . In general, the present data is largely consistent with what is known from the GSSP (Gorrondatxe section, Spain, Basque Provinces) of the base of Lutetian, where the LO of B. inflatus also marks the base of NP14b/CP12b subzones. In the present study, the LO of B. inflatus is reaffirmed as a reliable marker for correlating the base of the Lutetian. Discoaster sublodoensis, D. saiipenensis, D. bifax, D. martini and Tribrachiatus orthostylus show diachronous occurrences. Highlights: Calcareous nannofossil biostratigraphy and bioevents across the Ypresian/Lutetian boundary in Egypt and Jordan The Ypresian/Lutetian boundary is defined by the Lowest Occurrence (LO) of Blackites inflatus. The LO of B. inflatus is slightly above the LO of Turborotalia frontosa. The LO of B. inflatus is reaffirmed as a reliable marker for correlating the base of the Lutetian.