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Silicified microfossils from the Ediacaran Doushantuo Formation along a shelf margin-slope-basin transect in Hunan Province, South China, with stratigraphical implications

Published online by Cambridge University Press:  24 February 2025

Qing Ouyang Open the ORCID record for Qing Ouyang [Opens in a new window] ,
Chuanming Zhou ,
Shuhai Xiao Open the ORCID record for Shuhai Xiao [Opens in a new window] ,
Chengxi Wu ,
Zhe Chen ,
Xianguo Lang ,
Hongyi Shi  and
Yunpeng Sun
Qing Ouyang*
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China , , , , , State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074, China
Chuanming Zhou
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China , , , , , University of Chinese Academy of Sciences, Nanjing, Nanjing 211135, China
Shuhai Xiao
Affiliation:
Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, USA
Chengxi Wu
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China , , , , , University of Chinese Academy of Sciences, Beijing 100049, China
Zhe Chen
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China , , , , ,
Xianguo Lang
Affiliation:
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, and Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
Hongyi Shi
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China , , , , , University of Chinese Academy of Sciences, Beijing 100049, China
Yunpeng Sun
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China , , , , , University of Chinese Academy of Sciences, Beijing 100049, China
*
*Corresponding author
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Abstract

Silicified microfossils are reported from nine stratigraphic sections of the Ediacaran Doushantuo Formation deposited in shelf margin, slope, and basin environments in Hunan Province of South China. These microfossils include sphaeromorphic and acanthomorphic acritarchs (15 genera and 29 species, including three new acanthomorph species, Bullatosphaera? colliformis n. sp., Eotylotopalla inflata n. sp., and Verrucosphaera? undulata n. sp.), multicellular algae, tubular microfossils, and other problematic forms, representing major fossil groups similar to those from the Doushantuo Formation in more proximal facies (e.g., inner shelf and shelf lagoon). A database of the abundance and occurrences of Doushantuo acanthomorphs is assembled and analyzed using quantitative and data-visualization methods (e.g., rarefaction analysis, non-parametric multidimensional scaling, and network analysis). The results show that, at the genus and species levels, taxonomic richness of Doushantuo acanthomorphs exhibits considerable variation among facies, but this variation is largely due to sampling and taphonomic biases. The results also show that numerous acanthomorph taxa have broad facies distribution, affirming their biostratigraphic value. The analysis confirms that acanthomorphs in the Weng'an biota of shelf margin facies are composed of a mixture of Member II and Member III assemblages of shelf-lagoon facies in the Yangtze Gorges area. The study shows the biostratigraphic potential of acanthomorphs in the establishment of regional biozones using the first appearance datum of widely distributed taxa, highlighting the importance of continuing exploration of under-sampled Doushantuo sections in slope and basinal facies.

UUID: http://zoobank.org/6fc92858-4054-4117-8043-1f06cfe77155

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Memoir
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Journal of Paleontology , Volume 98 , Supplement S95 , November 2024 , pp. 1 - 79
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Copyright © The Author(s), 2025. Published by Cambridge University Press on behalf of Paleontological Society

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