Calcareous nannofossil biostratigraphy of the Paleocene at the Misheiti section, East Central Sinai, Egypt

Kasem, Atef M.; Wise, Sherwood W.; Faris, Mahmoud; Farouk, Sherif; Zahran, Esam

doi:10.1007/s12517-017-3217-4

Cited by 9 publications

(18 citation statements)

References 56 publications

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“…Several lineages for the family Fasciculithaceae have been previously proposed (Prins, 1971;Romein, 1979;Perch-Nielsen, 1985;Aubry et al, 2012;Monechi et al, 2013). Recent biostratigraphic and taxonomic studies highlighted a complex evolutionary history across the Danian-Selandian transition in which species are often characterized by short stratigraphic ranges (Aubry et al, 2011(Aubry et al, , 2012Monechi et al, 2012Monechi et al, , 2013Farouk and Faris, 2013;Kasem et al, 2017;Metwally, 2019;Mahanipour et al, 2021). In Fig.…”

Section: Evolutionary Trend Of Early Fasciculithsmentioning

confidence: 98%

Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition

Miniati

Cappelli

Monechi

2021

J. Micropalaeontol.

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Abstract. We present a taxonomic revision of the family Fasciculithaceae focused on forms that characterize the early evolution of this family group, which are currently included within the genera Gomphiolithus, Diantholitha, Lithoptychius and Fasciculithus. The investigation approach is based on a combined light microscope (LM) and scanning electron microscope (SEM) analysis of specimens from well-preserved ODP–DSDP site material (ODP Site 1209; Site 1262; ODP Site 1267; DSDP Site 356; DSDP Site 119) and outcrops (Bottaccione and Contessa, Italy; Qreiya, Egypt) across the Danian–Selandian transition. The direct LM–SEM comparison of the same individual specimen provides clarification of several taxa that were previously described only with the LM. One new genus (Tectulithus), five new combinations (Tectulithus janii, Tectulithus merloti, Tectulithus pileatus, Tectulithus stegastos and Tectulithus stonehengei) and six new species are defined (Diantholitha pilula, Diantholitha toquea, Lithoptychius galeottii, Lithoptychius maioranoae, Tectulithus pagodiformis and Fasciculithus realeae). The main characteristics useful to identify fasciculiths with the LM are provided, together with a 3D–2D drawing showing the main structural features. The accurate taxonomic characterization grants the development of an evolutionary lineage that documents a great fasciculith diversification during the late Danian and early Selandian. Four different well-constrained events have been documented: the lowest occurrence (LO) of Gomphiolithus, the paracme of Fasciculithaceae at the top of Chron C27r (PTC27r), the radiation of Diantholitha (LO Diantholitha), the paracme of Fasciculithaceae at the base of Chron C26r (PBC26r), the radiation of Lithoptychius (LO Lithoptychius) and the radiation of Tectulithus (lowest common occurrence of Tectulithus) that shows the biostratigraphic relevance of this group across the Danian–Selandian transition.

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Section: Evolutionary Trend Of Early Fasciculithsmentioning

confidence: 98%

Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition

Miniati

Cappelli

Monechi

2021

J. Micropalaeontol.

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“…The Zone NP6 is comparable to the Zone NP6 of [39], the Heliolithus kleinpellii Zone of [48], Zone CP5 of [43], and Subzones NTp10b and NTp10c as well as Subzone NTp11a of [45]. The reliability of the LO of H. kleinpellii as a zonal marker was disputed [6], and thus, some authors suggested that it might be diachronous [84]. In contrast, it was not documented from several sections in Egypt [78,85,86] as a result of a hiatus at the S/T transition.…”

Section: Biostratigraphical Remarks and Calcareous Nannofossil Zonesmentioning

confidence: 99%

“…The Paleocene Epoch (Series) has been formally divided into Danian, Selandian, and Thanetian Stages [1,2]. This epoch was characterized by short and extremely warm episodes (known as hyperthermal events) associated with sedimentological and isotopic changes as well as variations in calcareous nannofossil assemblages [3][4][5][6][7][8][9]. These Paleocene events comprise the Late Danian Event (LDE) [10][11][12][13]; the Danian/Selandian (D/S) transition event [14,15]; the early-late Paleocene event (ELPE, [3]), also known as the mid-Paleocene biotic event (MPBE, [4]); and likely part of the long-lasting environmental disruption during the Paleocene (i.e., the Selandian-Thanetian Transition Event, STTE, [8]).…”

Section: Introductionmentioning

confidence: 99%

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Biostratigraphy and Paleoenvironmental Reconstruction at the Gebel Nezzazat (Central Sinai, Egypt): A Paleocene Record for the Southern Tethys

et al. 2022

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The variations in assemblages of calcareous nannofossils are tracked in the Dakhla and Tarawan Formations exposed at Gebel Nezzazat (central Sinai, Egypt). Five calcareous nannofossil biozones, namely NP2/3, NP4, NP5, NP6, and NP7/8 are identified. A distinct marker bed related to the Latest Danian Event (LDE) occurs within the Dakhla Fm. The earliest representative of fasciculiths, Lithoptychius schmitzii, first occurs just below the LDE distinct bed and is followed by the Los of Diantholitha alata, D. mariposa, L. varolii, L. felis, and L. collaris. The abundance of calcareous nannofossils drops within the LDE distinctive bed. The base of Selandian Stage is here approximated at the base of Zone NP5 in concurrence with a sudden drop in the abundance of calcareous nannofossils. No considerable lithological changes are noted across this transition. The absence of subsequent occurrences of L. ulii, L. janii, L. billii, and L. stegostus suggest inconsistent lowest occurrences (Los) of these taxa, insufficient sampling resolution, and/or a hiatus. The base of Thanetian is approximated with the base of Zone NP7/8 in the topmost of Dakhla Fm. No considerable changes in calcareous nannofossil assemblages are associated in correspondence to this transition except the LO of D. mohleri, lowest continuous occurrence (LctO) of Bomolithus megastypus, and the increase in abundance of Heliolithus kleinpellii as well as a sudden drop in abundance within Zone NP7/8. The variations in calcareous nannofossil assemblages at Gebel Nezzazat suggest prevailing warm-water and oligotrophic conditions during the Paleocene and particularly along the Danian Stage that are interrupted by minor fluctuations in paleoclimatic conditions. In particular, the Danian–Selandian transition marks a decrease in warm and oligotrophic conditions that persisted along the Selandian Stage. The Selandian–Thanetian transition shows an increase of warm and oligotrophic conditions prevailed in the Thanetian record. The sudden decrease in abundance of calcareous nannofossils in both the Selandian and Thanetian is likely resulted from an increase in dissolution of carbonates rather than variations in the paleotemperature and/or paleofertility.

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“…The Table shows the 4.1. Discoaster mohleri Zone (NP7/8) (Hay, 1964;emended by Romein, 1979) The Discoaster mohleri Zone covers the sequence from the LO of Discoaster mohleri to the LO of D. multiradiatus and is assigned to the Thanetian (Kasem et al, 2017b). This zone occurs within the Tarawan Formation ( Figure 2).…”

Section: The Thebes Formationmentioning

confidence: 99%

Upper Paleocene-lower Eocene calcareous nannofossil stratigraphy at the Misheiti Section, Central Sinai, Egypt

Kasem¹,

Wise²,

Faris³

et al. 2020

Turkish J Earth Sci

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Dababiya Quarry Beds (DQBs; Dupuis et al., 2003) that were documented in several sections in Egypt (Tantawy, 2006; Khozyem et al., 2013). 2. Studied section and methods Twenty-two bulk rock samples were investigated from the upper Paleocene-lower Eocene at the Misheiti Section, Central Sinai, Egypt (Figure 1). Smear slides were prepared according to Bown and Young (1998) and investigated using a Zeiss Axio-Photo microscope at Florida State University, USA. We counted 300-400 calcareous nannofossil specimens on the slide to recognize the relative abundances of species (Jiang and Gartner, 1986). The calcareous nannofossil diversity represents the total number of species recorded in the sample. Thoracosphaera fragments greater than 4 µm were counted as a whole specimen (Gardin and Monechi, 1998). The state of preservation of the assemblage was described as good (G) for little or no evidence of etching and/or overgrowth, and moderate (M) when specimens exhibited some overgrowth and/or dissolution but the species was still recognizable (Kasem et al., 2017a). The calcium carbonate

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Calcareous nannofossil biostratigraphy of the Paleocene at the Misheiti section, East Central Sinai, Egypt

Cited by 9 publications

References 56 publications

Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition

Revised taxonomy and early evolution of fasciculiths at the Danian–Selandian transition

Biostratigraphy and Paleoenvironmental Reconstruction at the Gebel Nezzazat (Central Sinai, Egypt): A Paleocene Record for the Southern Tethys

Upper Paleocene-lower Eocene calcareous nannofossil stratigraphy at the Misheiti Section, Central Sinai, Egypt

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