贵州瓮安磷矿上震旦统陡山沱组上段产出大量球状化石。它们具有明显的细胞壁，八细胞体向中心汇聚的排列方式，单细胞及多细胞定形球体化石大小明显变化，数以亿计的极大丰度，常见化石保存皱缩的细胞壁而原生质已流失。诸多特征表明这些化石是藻类，主要是绿藻，而非动物胚胎。 A large number of spherical fossils are produced in the upper part of Upper Sinian Doushantuo Formation in Weng’an Phosphate Mine, Guizhou Province. They have obvious arrangement of cell wall and octagonal body toward the center. The size of single-cell and multicellular-shaped spheroid fossils changes obviously. Hundreds of millions of them are extremely rich in abundance. Common fossils save the shrinking cell wall and the protoplasm has been lost. Many features indicate that these fossils are algae, mainly green algae, not animal embryos.