Early middle Eocene Nummulites and isotope stratigraphy from Nile valley and BahariyaOasis
Almenoufy, Safia; MOHAMED BOUKHARY; Radwan AbulNasr;
Abstract
Areviewof the Nummulites in collections from Eocene limestones in Egypt identifies eighteen distinct species. including
four that are recognized here as new: Nummulitesminiaensis, N. benihassani, N. shurafaensis and N . niloticus. Sixteen of these species
occur in early to middle Eocene (Ypresian to Lutetian) assemblages from the Minia and Samalut Formations in theNileValley sequence,
assigned to the SBZ (shallow benthic zones) 10-12, while two occur in the Bartonian sequence of the Qazzun and El Hamra Formations
of Bahariya Oasis, in SBZ 17-18. In order to develop a sound Eocene bio-chronostratigraphy based on accurately identified Nummulites,
we correlate the units defined by the Nummulites species described here with standard microfossil biozones based on planktonic
foraminifera and calcareous nannoplanoton. Also, in order to understand the time relationship of species in different lineages, thepaleoecologic setting of each Nummulites occurrence is correlated with 18O and 13C stable isotope analysis.Key words: Systematic Paleontology, Nummulites, Biometry, Biostratigraphy, Nile Valley, Bahariya Oasis, Egypt.
four that are recognized here as new: Nummulitesminiaensis, N. benihassani, N. shurafaensis and N . niloticus. Sixteen of these species
occur in early to middle Eocene (Ypresian to Lutetian) assemblages from the Minia and Samalut Formations in theNileValley sequence,
assigned to the SBZ (shallow benthic zones) 10-12, while two occur in the Bartonian sequence of the Qazzun and El Hamra Formations
of Bahariya Oasis, in SBZ 17-18. In order to develop a sound Eocene bio-chronostratigraphy based on accurately identified Nummulites,
we correlate the units defined by the Nummulites species described here with standard microfossil biozones based on planktonic
foraminifera and calcareous nannoplanoton. Also, in order to understand the time relationship of species in different lineages, thepaleoecologic setting of each Nummulites occurrence is correlated with 18O and 13C stable isotope analysis.Key words: Systematic Paleontology, Nummulites, Biometry, Biostratigraphy, Nile Valley, Bahariya Oasis, Egypt.
Other data
| Title | Early middle Eocene Nummulites and isotope stratigraphy from Nile valley and BahariyaOasis | Authors | Almenoufy, Safia ; MOHAMED BOUKHARY ; Radwan AbulNasr | Issue Date | Jul-2016 | Journal | Micropaleontology, vol. 62, no. 2, text-figures 1–27, tables 1–17, plates 1–13, pp. 115–169, 2016 115 |
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