1 Introduction The Ediacaran Doushantuo Formation at Weng’an, Guizhou Province, southwest China is famous for the well-preserved phosphatized Weng’an biota, including algae, large spinous acritarchs, filaceous and spherical Cyanobacteria, microtubular cnidarian, dubious sponges, resting eggs and embryos of animals, etc. Chen and Liu (1986) first reported a few phosphatized globular fossils and large spinous acritarchs after acetic acid maceration of the deposit. Since then, the phosphat…