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Late Devonian–Mississippian conodont biostratigraphy of the Chelcheli section, NE Shahrud (Eastern Alborz, North Iran)

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Abstract

Devonian/Carboniferous conodonts from the Chelcheli section in the Alborz Mountains were investigated. Although conodonts are generally less abundant in the entire section, important zonal index taxa of the widely applied conodont standard zonation could be used for a precise conodont zonation. Forty-seven conodont species belonging to fifteen genera were identified and led to the discrimination of fifteen conodont zones, ranging from the Palmatolepis minuta minuta Zone into the Scaliognathus anchoralis-Doliognathus latus Zone. At the Devonian/Carboniferous boundary (DCB), characteristic lithologies such as black shales and massive sandstones represent equivalents of the Hangenberg Black Shale and Hangenberg Sandstone. Close to the DCB, there is a small stratigraphic hiatus in the conodont record which might be a result of facies (shallow-water succession with no conodont record and siliciclastic rocks) rather than a period of non-deposition as the sedimentological record seems continuous. Similar to other DCB sections in shallow-water facies in Iran the two biostratigraphically important species Protognathodus kockeli and Protognathodus kuehni do not occur.

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Acknowledgements

Iliana Boncheva, Claudia Spalletta, Mehdi Yazdi, and the Editor-in-Chief Mike Reich are thanked for constructive reviews of the submitted manuscript. The authors are grateful to Office of Vice Chancellor for Research and Technology at the University of Isfahan for financial and technical support. This study was undertaken at the University of Isfahan in cooperation with the Senckenberg Research Institute and Natural History Museum, Frankfurt. This is a contribution to the International Geoscience Programme IGCP 652 and IGCP 700. One of the authors (P.K.) acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG; KO 1622/16-1).

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Authors and Affiliations

  1. Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran

    Ali Bahrami

  2. Senckenberg, Research Institute and Natural History Museum, Senckenberganlage 25, 60325, Frankfurt am Main, Germany

    Peter Königshof

  3. Geological Survey NRW, De-Greiff-Str. 195, 47803, Krefeld, Germany

    Christoph Hartkopf-Fröder

  4. State Museum of Natural History Stuttgart, Rosenstein 1, 70191, Stuttgart, Germany

    Sandra I. Kaiser

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  1. Ali Bahrami
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  2. Peter Königshof
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  3. Christoph Hartkopf-Fröder
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  4. Sandra I. Kaiser
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Correspondence to Ali Bahrami.

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Handling Editor: Mike Reich.

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Bahrami, A., Königshof, P., Hartkopf-Fröder, C. et al. Late Devonian–Mississippian conodont biostratigraphy of the Chelcheli section, NE Shahrud (Eastern Alborz, North Iran). PalZ 96, 449–469 (2022). https://doi.org/10.1007/s12542-021-00575-6

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