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- W761370454 abstract "Abstract Reasonably diverse and moderately preserved palynofloras of exclusively terrestrial derivation occur in surface samples of the Nayband Formation, Kamar Macheh Kuh, southeastern Tabas, east-central Iran. No marine palynomorphs encountered in the samples examined. The palynofloras comprise 62 species including radially symmetrical and monolete spores (37 species allocated to 27 genera) and pollen (25 species designated to 19 genera). Of the latter, such bisaccate taxa as Ovalipollis ovalis, Alisporites spp., Falcisporites nuthallensis, the inaperturate Araucariacites australis, and the monosulcate Chasmatosporites major dominate the assemblages. Representatives of such trilete spores as Dictyophyllidites mortonii, Kyrtomisporis laevigatus, and Gleicheiniidites senonicus are essentially abundant in the palynofloras examined. Vertical distribution of miospores allows erection within the Nayband Formation of three informal distinctive stratigraphically successive interval biozones, viz., A. australis–Annulispora folliculosa biozone, Conbaculatisporites sp.–Ricciisporites tuberculatus biozone, and R. tuberculatus–Polypodiisporites polymicroforatus biozone based on the First Observed Occurrence (FOO) and Last Observed Occurrence (LOO) of selected taxa. These are compared with palynozones from ±coeval strata in Iran and elsewhere. Additionally, two non-palyniferous intervals, one at the base (188 m thick) and another (18 m in thickness) at uppermost part of the section studied are identified. Based on the association of such key misopore species as Lunatisporites rhaeticus, O. ovalis (alias pseudoalatus), A. folliculosa, Polycingulatisporites mooniensis, Limbosporites lundbladii, Quadraeculina anellaeformis, R. tuberculatus, Conbaculatisporites sp., P. polymicroforatus, and Striatisaccus novimundi within the Nayband palynofloras, the host strata are assigned to Late Triassic (Norian–Rhaetian). This dating while corroborating previous attempts made with reference to mostly paleozoological evidence, slightly deviates from that previously envisioned (Early Jurassic) for upper part of the Nayband Formation at the section examined. Moreover, lack of such Early Jurassic (Hettangian) key taxa as Trachysporites fuscus, Cerebropollenites thiergartii, Heliosporites reissingeri, and Pinuspollenites minimus in the assemblages studied upholds this conclusion. Apparent taxonomical dissimilarity between the Norian and Rhaetian palynofloras examined and joint occurrence in the latter of several Rhaetian miospore species known as independently occurring in assemblages from either southern or northern hemisphere is interpreted to reflect geodynamic history of the Iran Plate during Late Triassic. Inferred natural relationships of the Nayband sporae dispersae imply derivation from such diverse parental flora as, in descending quantitative order, Pterophyta, Lycopodophyta, Arthrophyta, Coniferophyta, Ginkgophyta, Pteridospermophyta, and Bryophyta. Abundance of ferns and coniferophytes in parent flora of the palynofloras investigated implies that the host strata accumulated under a moist warm climate with progressively decreasing temperature during late Late Triassic." @default.
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- W761370454 date "2015-11-01" @default.
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- W761370454 title "Palynostratigraphy of the Nayband Formation, Tabas, Central Iran Basin: Paleogeographical and paleoecological implications" @default.
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- W761370454 doi "https://doi.org/10.1016/j.jseaes.2015.05.030" @default.
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