文献类型：期刊文献

英文题名：AFFINITIES AND TAPHONOMY OF A CAMBRIAN DISCOID FROM GUIZHOU, SOUTH CHINA

作者：Yang, Xinglian Zhao, Yuanlong Wu, Weiyi Sun, Zongyuan Zheng, Haolin Zhu, Yajie

第一作者：Yang, Xinglian

通信作者：Yang, XL[1]

机构：[1]Guizhou Univ, Coll Resource & Environm, Guiyang 550003, Peoples R China;[2]Chinese Acad Sci, Nanjing Inst Geol & Paleontol, State Key Lab Paleobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China;[3]Guizhou Inst Technol, Deans Off, Guiyang 550003, Peoples R China

第一机构：Guizhou Univ, Coll Resource & Environm, Guiyang 550003, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Resource & Environm, Guiyang 550003, Peoples R China.

年份：2014

卷号：88

期号：2

起止页码：339-347

外文期刊名：JOURNAL OF PALEONTOLOGY

收录：;Scopus(收录号：2-s2.0-84897976179);WOS:【SCI-EXPANDED(收录号:WOS:000332752500012)】；

基金：This research was supported by the National Natural Science Foundation of China (Nos. 41362002, 40902003), National Basic Research Program of China (2013CB835002), State Key Laboratory of Paleobiology and Stratigraphy (Nanjing Institute of Geology and Paleontology or NIGP) (No. 113109), Guizhou Natural Science Foundation (No. Gui J. 2011-2035). Special thanks are due to Cui Tao, Zhu Mingjin, and Zhu Luyan from Guizhou University for assistance in the field, Yin Leiming from NIGP for help in the interpretation of extracellular polymeric substance, Yan Fang and Zongjun Yin from NIGP in SEM microphotography and EDS analysis, and Maoyan Zhu from NIGP and Shuhai Xiao from Virginia Tech for valuable discussion. B. A. MacGabhann from National University of Ireland and an anonymous reviewer provided critical comments, and S. Christianson of Drake University improved the English writing of the manuscript.

语种：英文

摘要：Disc-like fossils from siltstones of the Taozichong Formation (Cambrian) in the Qingzhen area, Guizhou, South China are reported here. They are similar to some Ediacaran and Phanerozoic discoidal fossils, and assigned to Tirasiana? disciformis? Palij, 1976. Based on the study of 43 specimens, dewatering or fluid escape structures, soft-sediment loading, scratch circles or other inorganic origins are ruled out, and the fossil is interpreted as a discoidal body fossil of unknown affinities rather than trace fossils. Energy-dispersive X-ray spectroscopy and elemental mapping analyses reveal that the discoid fossils contain higher concentrations of C, Fe, and P than the surrounding matrix, indicating the possible presence of pyrite, apatite, and organic carbon as a result of authigenic mineralization in association with decay and early diagenetic processes. The possible presence of extracellular polymeric substance suggests that the discs were surrounded by thin microbial mats composed primarily of extracellular polymeric substances, which facilitated their fossilization by promoting conditions that are favorable to secondary mineral precipitation. The new specimens provide useful information about the phylogenetic affinities of these early discoidal fossils and help us to better understand the taphonomic modes of non-biomineralizing organisms in Ediacara-type and Burgess Shale-type biotas.