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Article: Katian (Ordovician) to Aeronian (Silurian, Llandovery) graptolite biostratigraphy of the YD‐1 drill core, Yuanan County, Hubei Province, China

Papers in Palaeontology - Volume 7 Issue 1 - Cover
Publication: Palaeontology
Volume: 7
Part: 1
Publication Date: Febuary 2021
Page(s): 163 194
Author(s): Jörg Maletz, Chuanshang Wang, and Xiaofeng Wang
DOI: 10.1002/spp2.1267
Addition Information

How to Cite

MALETZ, J., WANG, C., WANG, X. 2021. . Papers in Palaeontology, 7, 1, 163-194. DOI: /doi/10.1002/spp2.1267

Author Information

  • Jörg Maletz - Department of Earth Sciences FU Berlin Malteserstrasse 74‐100 D‐12249 Berlin Germany
  • Chuanshang Wang - Wuhan Center of China Geological Survey No.69, Guanggu Road Wuhan City Hubei Province China
  • Xiaofeng Wang - Wuhan Institute of Geology and Mineral Resources Wuhan Hubei 430225 China

Publication History

  • Issue published online: 08 March 2021
  • Manuscript Accepted: 14 December 2018
  • Manuscript Received: 03 September 2018

Funded By

China Ministry of Sciences and Technology and China Geological Survey. Grant Numbers: 2015FY310100‐7, DD20160120‐04, 121201009000172111

Online Version Hosted By

Wiley Online Library
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Abstract

The graptolite succession of the YD‐1 drill core provides a new view into the lower Silurian (Llandovery) biostratigraphy of the Yichang region on the Yangtze platform of China. A thick succession of black to greenish, fine to silty shales and siltstones with a variable amount of poorly to well‐preserved graptolite faunas ranges from the upper Ordovician Dicellograptus ornatus Biozone (upper Katian) to the lower Silurian Lituigraptus convolutus Biozone (mid Aeronian). The Metabolograptus extraordinarius/Metabolograptus persculptus and Akidograptus ascensus/Parakidograptus acuminatus Biozone intervals are strongly condensed and bear poorly preserved graptolite faunas. A considerable gap can be detected above the Cystograptus vesiculosus Biozone, as the succeeding graptolite fauna indicates the upper Pribylograptus leptotheca Biozone. The interval of the upper Rhuddanian Coronograptus cyphus Biozone to the Lower Aeronian Coronograptus gregarius Biozone is missing. Lituigraptus convolutus was found from 1322.85 to 950.20 m, indicating a thickness of the Lituigraptus convolutus Biozone of at least 378.47 m. The age of the highest available graptolite faunas from the 729.40–750.70 m is inconclusive, but the level may still belong to the Lituigraptus convolutus Biozone. The correlation of the succession with other successions on the Yangtze platform of China indicates the need for a considerable modification of the graptolite biostratigraphy of the Yangtze platform in the Yichang region and revision of the described faunas. The Llandovery appears to be highly incomplete in the eastern flank of the Huangling anticline and the age of the biostratigraphically younger part of the succession cannot be dated precisely with graptolite faunas.

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