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CUI Tao~ 1),YANG Xing-lian~ 1,2)and ZHAO Yuan-long~ 1)1)College of Resource and Environment Engineering,Guizhou University,Guiyang 550003,China;2)State Key Laboratory of Paleobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China  
The early Cambrian Niutitang biota is widespread in the basal Cambrian black shales in Guizhou and Hunan provinces,South China.Through systematic excavation of the Niutitang Biota at the Heishapo section,near Songlin,Zun-yi,three fossil-rich layers have been recognized.In the ascending order,there are Perspicaris layer,sponge layer and trilobites,and a Sphenothallus layer similar to the Chengjiang Biota.Based on the taphonomic analyses of more than 1000 specimens,it is demonstrated that fossils of the Niutitang biota are predominantly preserved as articulated skeletons or carapaces without sorting,but lacking preservation of soft-tissues and structure.No bioturbation and endobenthos have been founded in the biota.Together with information of lithology,geochemistry and sedimentary structures,we considered that the Niutitang biota is an in-situ buried community under a quiet,poor oxygen bottom water condition with slow deposition.There had been many oxygenation events happened during the sedi-mentary period of Niutitang Formation,however,the length of oxidated time and the differences of redox interface led to the formation of different bio-assemblages.
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