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A new Rhaetian plant assemblage from Zilanba, the northern Sichuan Basin, South China

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Abstract

Triassic and Jurassic strata are thick and widely distributed in the Sichuan Basin, South China. In particular, the continental Upper Triassic Xujiahe Formation is well-exposed in this region, yielding rich assemblages of fossil plants. Here, a new Rhaetian fossil assemblage is reported from Zilanba in the Guangyuan area, northern Sichuan Basin. In this locality, 29 species of fossil plants belonging to 17 genera have been newly collected and identified within Member III of the Xujiahe Formation. Based on the floral assemblages and previous magnetostratigraphic and palynostratigraphic studies, the host strata are considered Rhaetian in age. This flora in the Guangyuan area is dominated by Cycadales and Bennettitales but also contains abundant ferns and less common sphenopsids, conifers and other gymnosperms. The occurrence of some climate-diagnostic plants, such as Dipteridaceae, Anthrophyopsis and Ptilozamites, indicate that this area experienced a humid and warm tropical or subtropical climate during the Rhaetian.

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Data availability statement

The dataset (all specimens) analysed during the current study are available in the fossil collection of Nanjing Institute of Geology and Palaeotology, Chinese Academy of Science, Nanjing, China (NIGPAS), and open for public accessibility. If there is any difficulty for accessing, the corresponding author is willing to help. The serial number of every specimen was listed in the manuscript. http://bbg.nigpas.ac.cn/#/index.

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Acknowledgements

We thank Mr. Huaxin Zhang, Mr. Yaoyu Li (Southwest Petroleum University), Dr. Xiaoqing Zhang and Mr. Hongyu Chen (NIGPAS) for support during the field work. Many thanks to Dr. Evelyn Kustatscher and Dr. Ning Tian, for their advice and constructive comments on the manuscript.

Funding

This study is financially supported by the National Natural Science Foundation of China (grant numbers 42330208, 42072009, 41972120, 42172129), the Stratigraphic Priority Program (B) of the Chinese Academy of Sciences (grant number XDB 2610302), the Programs from State Key Lab of Palaeobiology and Stratigraphy (20191103, 173131, 213112), and CSC (grant number 202204910396). S.M. is supported by grants from the Swedish Research Council (VR grant numbers 2018-04527 and 2022-03920).

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  1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China

    Yuanyuan Xu & Yongdong Wang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yuanyuan Xu

  3. Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden

    Yuanyuan Xu & Stephen McLoughlin

  4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500, China

    Mihai Emilian Popa, Jianli Zeng & Tingshan Zhang

  5. University of Bucharest, Faculty of Geology and Geophysics, Doctoral School of Geology, Laboratory of Palaeontology, 1, N. Bălcescu Ave, 010041, Bucharest, Romania

    Mihai Emilian Popa

  6. College of Paleontology, Shenyang Normal University, Shenyang, 110034, China

    Ning Lu

  7. Zhejiang Institute of Geology and Mineral Resources, Hangzhou, 310000, China

    Liqin Li

  8. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu, 610000, China

    Tingshan Zhang

  9. University of Chinese Academy of Sciences, Nanjing, 210006, China

    Yongdong Wang

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  1. Yuanyuan Xu
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  2. Mihai Emilian Popa
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  3. Stephen McLoughlin
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  4. Ning Lu
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  5. Liqin Li
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  6. Jianli Zeng
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  7. Tingshan Zhang
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  8. Yongdong Wang
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Correspondence to Mihai Emilian Popa or Yongdong Wang.

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Xu, Y., Popa, M.E., McLoughlin, S. et al. A new Rhaetian plant assemblage from Zilanba, the northern Sichuan Basin, South China. Palaeobio Palaeoenv (2024). https://doi.org/10.1007/s12549-024-00599-1

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  • DOI: https://doi.org/10.1007/s12549-024-00599-1

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