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Revisiting the spore assemblages from the Lower Devonian Posongchong Formation of Wenshan, Yunnan Province, southwestern China

Published online by Cambridge University Press:  10 October 2018

B. Cascales-Miñana ,
J. Z. Xue ,
G. Rial ,
P. Gerrienne ,
P. Huang  and
P. Steemans
B. Cascales-Miñana*
Affiliation:
Palaeobiogeology-Palaeobotany-Palaeopalynology, Department of Geology, University of Liège, Allée du 6 Août, B18 Sart Tilman, B4000 Liège, Belgium. Email: [email protected]
J. Z. Xue*
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, People's Republic of China. Email: [email protected]
G. Rial
Affiliation:
Palaeobiogeology-Palaeobotany-Palaeopalynology, Department of Geology, University of Liège, Allée du 6 Août, B18 Sart Tilman, B4000 Liège, Belgium. Email: [email protected]
P. Gerrienne
Affiliation:
Palaeobiogeology-Palaeobotany-Palaeopalynology, Department of Geology, University of Liège, Allée du 6 Août, B18 Sart Tilman, B4000 Liège, Belgium. Email: [email protected]
P. Huang
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, People's Republic of China. Email: [email protected]
P. Steemans
Affiliation:
Palaeobiogeology-Palaeobotany-Palaeopalynology, Department of Geology, University of Liège, Allée du 6 Août, B18 Sart Tilman, B4000 Liège, Belgium. Email: [email protected]
*
*Corresponding author
*Corresponding author
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Abstract

The Lower Devonian Posongchong Formation (Wenshan, Yunnan Province, southwestern China) consists of a series of continental deposits with an outstanding plant megafossil diversity. More than 20 years ago, this formation was interpreted as ‘Siegenian' (∼Pragian) in age based on palynology. However, such interpretation needs further evidence because of the known differences between the dispersed spore assemblages from South China and Euramerica/northwestern Gondwana. Here, we present new dispersed spore assemblages recently recovered from the Posongchong Formation. The isolated spore diversity is highly diverse, with 18 genera and 32 species. The recognised taxa include, among others, Ambitisporites avitus, Aneurospora conica, Aneurospora posongchongensis sp. nov., Aneurospora xujiachongensis, Apiculiretusispora plicata, Archaeozonotriletes chulus, Concentricosisporites agradabilis, Dibolisporites echinaceus, Emphanisporites rotatus, Gneudnaspora divellomedia, Latosporites ovalis, Retusotriletes triangulatus, Tetrahedraletes medinensis and Verrucosporites polygonalis, with Aneurospora and Retusotriletes being the most abundant forms. The known Posongchong palynoflora (previous spore data included) suggests that the Posongchong Formation assemblages can be correlated with the Pragian interval of the polygonalis–wetteldorfensis Oppel Zone (PoW). This age determination is supported by the presence of index species of PoW, such as Verrucosporites polygonalis, Dictyotriletes subgranifer and Camarozonotriletes parvus (sensu Steemans, 1989), the latter being known only from the Pragian of Belgium and Germany. Recent advances in the study of the marine faunas in the overlying sequences also indicate a Pragian age for the Posongchong Formation. This new investigation of the Posongchong palynoflora highlights differences of abundance at species level between the Gondwanan–Laurussian floras during the Early Devonian.

Keywords

palynofloraphytogeographyPragianSouth China
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 108 , Issue 4: Agora Paleobotanica , December 2017 , pp. 339 - 354
Copyright
Copyright © The Royal Society of Edinburgh 2018 

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