中文摘要：

贵州金沙岩孔剖面的寒武系牛蹄塘组为跨阶地层,以镍钼矿层为分界面,其上部属于筇竹寺阶,下部为梅树村阶。近期,作者利用15%左右的醋酸浸泡金沙岩孔剖面牛蹄塘组底部（梅树村阶）的岩样,发现了以球形化石为主的单胞、多胞球形类小壳动物化石,包括Olivooides pearformis和其余两类未确定的球形化石。此次球形化石的发现不仅丰富了牛蹄塘生物群的生物面貌,而且为解译早期后生动物的起源和演化、胚胎生物学提供了化石资料。

英文摘要：

The Niutitang Formation of the Yankong section,Jinsha,Guizhou is characterized by a diachronous,transgressive black shale sequence spanning the Meishucunian and Qiongzhusian,and the Ni-Mo ore layer is used as a stratigraphic marker for defining the base of the Qiongzhusian.Recently,spherical fossils were obtained by a standard acid digestion of silicious phosphate from the base of Niutitang Formation in Jinsha.These spherical fossils are mainly consisted of unicell or multi-cell structure,and indentified as Olivooides pearformis and two other undefined spherical fossils.The discovery of spherical fossils from Jinsha not only enrichs the fossil assemblage of the Niutitang biota,but also shed an light on the the origin and evolution of early metazoan and embryology.