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A new Late Devonian flora from Sonid Zuoqi, Inner Mongolia, northeastern China

Published online by Cambridge University Press:  22 October 2021

Lingqi Bai
Affiliation:
School of Earth and Space Sciences, Peking University, Beijing 100871, China Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Pu Huang
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
Ning Yang
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
Wenxin Ju
Affiliation:
Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Geological Survey of Inner Mongolia, Hohhot 010020, China
Jianbo Liu
Affiliation:
School of Earth and Space Sciences, Peking University, Beijing 100871, China
James F. Basinger
Affiliation:
Department of Geological Sciences, University of Saskatchewan, S7N 5E2 Saskatoon, Saskatchewan, Canada
Honghe Xu*
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
Jinzhuang Xue*
Affiliation:
School of Earth and Space Sciences, Peking University, Beijing 100871, China
*
*Corresponding authors
*Corresponding authors

Abstract

The Silurian and Devonian plant fossil record is the basis for our understanding of the early evolution of land plants, yet our appreciation of early global phytogeographic evolution has been constrained by the focus of most studies on deposits from Europe, North America, and, more recently, South China. Devonian plants have been recorded rarely from northeastern China, and among previous records, few plants have been illustrated and formally described. In this article, megafossil plants representing a Late Devonian-aged (probably Famennian) flora are described from a locality at northern Sonid Zuoqi, Inner Mongolia, NE China. The flora includes Melvillipteris sonidia new species, Archaeopteris sp., and fragments of some other plants. The new plant shows main axes and two orders of lateral branches. The first-order branches of this plant show a typical zigzag appearance and are borne in pairs on main axes. Second-order branches are straight or slightly flexed, and are borne helically or alternately on first-order branches. Sterile ultimate appendages and fertile structures of M. sonidia n. sp. are borne alternately on second-order branches. An associated palynological assemblage, as well as U-Pb ages of detrital zircon grains from adjacent horizons, are also reported, indicating a Late Devonian age in accord with the megafossil plants. The present study contributes to our appreciation of the Devonian floristic diversity of the Xing'an Block, and, through our review of the record of early vascular plants from NE China, more broadly to the understanding of the mid-latitude vegetation of the Northern Hemisphere during the Late Devonian.

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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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