Qiu-yun Yuan from the Nanjing Hongchuang Geological Exploration Technology Service Co.,Ltd.and Dan Zhu and Shi-yang Pan from the Hubei Geological Research Laboratory assisted in the carbon and oxygen isotope analyses.Three professorate senior engineers Jing Li,Hu Zhang,and Sai-ying Yu from the Yunnan Geological Survey Institute guided the preparation of this manuscript.Thanks also go to Yu Liu from the Yunnan University for providing CT photos of fossils and to researcher Shi-xing Zhu from the Tianjin Institute of Geology and Mineral Resources,China,for providing multicellular fossil photos taken using microscopes.The reviewers put forward valuable suggestions for revision.The&nbsp （）

authors hereby would like to extend their sincere gratitude to all of them.The work was financially supported by the project entitled 1:50000 Regional Geological Survey of Samaki,Yinmin,Guicheng,and Shugu Sheets in Yunnan Province(D201905)organized by the Land and Resources Department of Yunnan Province,Training Object Project of technological innovation talents in Yunnan Province(202205AD160073),the project entitled"1:50000 Regional Geological Survey of Dazhuang,Fabiao,Ditu,and Dianzhong Sheets in Yunnan Province"(S53A00722001048-007),"Joint Foundation Project between Yunnan Science and Technology Department and Yunnan University"(CY21624103)and the project entitled"Area Summary and Service Product Development of Regional Geological Surveys in Yunnan Province"initiated by the China Geological Survey(121201102000150012-02). （D201905）