The Late Tremadocian (Ordovician) Graptolite Kiaerograptus from Central Hunan, China: Taxonomy and Biostratigraphy

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This work was supported in part by the National Key Research and Development Program (Grant Nos. 2022YFF0800302), the Natural Science Foundation of China (Grant Nos. 42072005, 42172035), the China Geological Survey Project (Grant Nos. DD20221649), UNESCO: IUGS IGCP project 735 “Rocks and the Rise of Ordovician Life: Filling knowledge gaps in the Early Palaeozoic Biodiversification”, and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDB26000000). We thank anonymous reviewers and Dr Susan Turner (Brisbane) for their constructive remarks on the manuscript, and the China Geological Survey Stratigraphy and Palaeontology Data Base (, which documents the fossil data of this study.

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    Well-preserved graptolites of the genus Kiaerograptus are first reported from the upper Tremadocian Yinchupu Formation in the Nanba section, Yiyang, Hunan Province, South China, including four species, i.e., Kiaerograptus lauzonensis (Erdtmann, 1966), Kiaerograptus stoermeri (Erdtmann, 1965), Kiaerograptus cf. supremus? Lindholm, 1991, and Kiaerograptus sp., which are robust in form. Based on these new specimens, the Kiaerograptus biozone is established for the first time in South China, increasing the late Tremadoc graptolite biozones in South China from four to five, in ascending order as follows: the Adelograptus tenellus biozone, the Aorograptus victoriae biozone, the Kiaerograptus biozone, the Sagenograptus murrayi biozone, and the Hunnegraptus copiosus biozone. A review of the occurrence records for robust Kiaerograptus species worldwide reveals that the distribution is restricted to the Aorograptus victoriae biozone and Kiaerograptus biozone in the late Tremadocian. This limited stratigraphical distribution makes Kiaerograptus a valuable taxon for precise biostratigraphical correlation at both the regional and global scales.

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LI Ming, LI Lixia, WANG Wenhui.2023. The Late Tremadocian (Ordovician) Graptolite Kiaerograptus from Central Hunan, China: Taxonomy and Biostratigraphy[J]. Acta Geologica Sinica(),97(1):1-12

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  • Received:March 17,2022
  • Revised:September 14,2022
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  • Online: February 28,2023
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