| Two Species of Zosterophyllum from South China and Dating of the Xujiachong Formation with a Biostratigraphic Method |
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| 作者姓名： | WANG Deming |
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| 作者单位： | Key Laboratory of Orogenic Belts and Crustal Evolution, Department of Geology, Peking University, Beijing 100871 |
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| 基金项目： | Acknowledgements This study is supported by the National Natural Science Foundation of China （grants 40302001 and 40232019）, a foundation for the Author of National Excellent Doctoral Dissertation of China （200429）. The author thanks Professor Hao Shougang for his valuable discussion. Thanks are also due to Liu Zhenfeng and Xue Jinzhuang for their help in the field work. |
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| 摘 要： | Zosterophyllum longa sp.nov.is reported from the Lower Devonian Pingyipu Formation, Jiangyou District,northern Sichuan of China.This new plant has vertically elongate sporangia differing from all known species of Zosterophyllum,demonstrating morphological variations in Zosterophyllophytina.New materials of Zosterophyllum yunnanicum from the Lower Devonian Xujiachong Formation,Qujing District,eastern Yunnan of China show that fertile axes of this species are anisotomous or pseudomonopodial or K-shaped in branching.Sometimes fertile lateral axes are very short and bear an axUlary axis at the dividing point.Distinct thickening occurs along the whole margin of a sporangium,with sporangial lobes undeveloped.The evolution of Zosterophyllum is tentatively discussed.A biostratigraphic method of Gerrienne and Streel is introduced and applied to dating of the Lower Devonian Xujiachong Formation,which is considered as of the late Pragian-early Emsian.
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| 关 键 词： | 工蕨属 中国 南方 生物地层学 |
| 修稿时间： | 2006-07-312007-01-26 |
Two Species of Zosterophyllum from South China and Dating of the Xujiachong Formation with a Biostratigraphic Method |
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| Authors: | WANG Deming Key Laboratory of Orogenic Belts and Crustal Evolution |
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| Institution: | WANG Deming Key Laboratory of Orogenic Belts and Crustal Evolution,Department of Geology,Peking University,Beijing |
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| Abstract: | ZosterophyUum longa sp. nov. is reported from the Lower Devonian Pingyipu Formation, Jiangyou District, northern Sichuan of China. This new plant has vertically elongate sporangia differing from all known species of Zosterophyllum, demonstrating morphological variations in Zosterophyllophytina. New materials of Zosterophyllum yunnanicum from the Lower Devonian Xujiachong Formation, Qujing District, eastern Yunnan of China show that fertile axes of this species are anisotomous or pseudomonopodial or K-shaped in branching. Sometimes fertile lateral axes are very short and bear an axillary axis at the dividing point. Distinct thickening occurs along the whole margin of a sporangium, with sporangial lobes undeveloped. The evolution of ZosterophyUum is tentatively discussed. A biostratigraphic method of Gerrienne and Streel is introduced and applied to dating of the Lower Devonian Xujiachong Formation, which is considered as of the late Pragian-early Emsian. |
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| Keywords: | Zosterophyllum longa sp nov Z yunnanicum biostratigraphic method Early Devonian Xujiachong Formation South China |
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