中文摘要：

通过系统发掘发现遵义松林寒武纪早期牛蹄塘生物群自下而上存在3个化石富集层：锐虾Perspicaris富集层、海绵动物富集层和带有澄江生物群色彩的三叶虫、楔叶形虫Sphenothallus富集层。牛蹄塘生物群化石保存完整、分选性差、无明显的定向性、缺少软躯体化石和底内生物,结合岩性、地球化学、构造等特征综合认为牛蹄塘生物群是弱水动力作用下缓慢沉积的原地埋藏群落。牛蹄塘组沉积时期曾有过多次充氧事件,水体氧化时间的长短以及底层水氧化-还原界面的差异导致了不同的生物组合。

英文摘要：

The early Cambrian Niutitang biota is wide-spread 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 skeletons or carapaces without sorting, articulated lacking preservation of soft-tissues and structure. No bio-turbation 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.