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Progress of the Scientific Excavation on the Early Triassic Marine Reptile Fauna from Majiashan (Chaohu,Anhui Province) and Its Significance

Chen Guanbao;Ji Cheng;Huang Jiandong;Zhang Rong;Sun Zuoyu;Li Yan;Sun Jicai;Jiang Dayong;Anhui Paleontological Museum;State Key Laboratory of Palaeobiology and Stratigraphy;Department of Geology and Geological Museum;  
The Early Triassic marine reptile fauna from Majiashan(Chaohu,Anhui Province) is characterized by a large number of Chaohusaurus materials.In the current paper,we reviewed the research history and the remained problems and reported the progress of the scientific excavation on this fauna.It is the earliest and best preserved marine reptile fauna of the Mesozoic.The collection,protection and comprehensive research of this fauna will provide new data on the origin,early evolution,radiation and paleogeography of the marine reptiles such as ichthyosaurs,which has important scientific significance.At least three marine reptile species have been found from Majiashan quarry through the excavation co-occurring with abundant fish and invertebrate fossils.It is the first locality in the Early Triassic that has yielded more than one species of marine reptiles in the world.Contrary to the previous knowledge,the high divert of Chaohu Fauna suggests that the recovery of the marine ecosystem after the end-Permian mass extinction is rapid rather than delayed.
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