Plant macrofossils of the Kalariz formation (Rhaetian) in the Javaherdeh region (North of Iran): Dating, geographical expansion, and their correlation with the other Rhaetic florizone in Iran

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Saadatnejad Javad

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Journal Paper

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Journal: GEOSCIENCES Year:2024 | Volume:34 | Issue:3 Page(s): 135-164

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Title

Plant macrofossils of the Kalariz formation (Rhaetian) in the Javaherdeh region (North of Iran): Dating, geographical expansion, and their correlation with the other Rhaetic florizone in Iran

Author(s)

Saadatnejad Javad | Issue Writer Certificate

Keywords

plant macrofossils

Rhaetian

Kalariz Formation

Shemshak Group

Javaherdeh

Abstract

Kalariz formation beds in Javaherdeh area has well exposure for plant macrofossils study. The studied area is located at the northern Alborz structural-facies zone, The Kalariz formation in Javaherdeh section consists of shale, siltstone, sandstone and conglomerate beds with coal veins and intrusive beds. It lies conformably, with a coarse grain sandstone bed, on top of the Laleband formation . Its upper contact is unconformable and sharp under the conglomerate beds of Javaherdeh formation. In this study 29 species of plant macrofossils from 13 genera were studied and introduced, including orders of Equisetales, Osmundales, Filicales, Cycadales, Bennettitales, Ginkgoales and Coniferales and an unknown reproductive organ. On the basis of the occurrence of index fossils such as Cladophlebis nebbensis, Nilssonia brevis, Dictyozamites asseretoi, Taeniopteris reversa, Taeniopteris tenuinervis and Baiera muensteriana Rhaetian age, and based on the occurrence of index taxa such as Dictyophyllum exile, Pterophyllum aequale and Pterophyllum bavieri, Late Rhaetian age is proposed for this assemblage. In this study, Ginkgoites whitbiensis from Iran and Taeniopteris reversa from Alborz are recorded for the first time. Clathropteris elegans, Nilssonia harrisi, Ginkgoites parasingularis and Ginkgoites lepida are recorded for the first time from Late Triassic beds of Iran

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