贵州瓮安陡山沱期矿化生物群的研究进展和意义

贵州瓮安陡山沱期矿化（磷酸盐化和硅化）生物群的研究近年来倍受关注，它为研究包括后生动物在内的多细胞生物早期演化提供了十分难得的机遇。最近，由于其中部分磷酸盐化球状化石保存了与某些后生动物胚胎早期发育阶段类似的卵裂特征，被认为是后生动物的休眠卵和胚胎化石。但是，由于至今未发现可靠的囊胚期到原肠胚期和幼体孵化的化石证据，此类化石的动、植物之争一直没有停止。作者近期对该套含磷地层进行了系统的分析研究，除已报道的大量休眠卵和胚胎化石外，还发现保存原肠发育特征的磷酸盐化实体化石、蓝藻细胞集合体、可疑海绵动物化石及类似瓶形的不明化石等。研究表明，陡山沱期矿化生物群具有多样性特征，包含了多种门类的不同类型，是迄今为止全球保存最完好的未元古纪磷质化石库。

Advances in the Study of Permineralized Biota of Doushantuo Stage in Weng'an, Guizhou Province and Their Geological Significance

In recent years, great importance has been attached to the study of permineralized (silicified and phosphatized) biota of the Doushantuo Stage in Weng'an, Guizhou Province, which provides an important opportunity of studying early stage evolution of metazoan including multicellular organisms. As some phosphatized spheroidal fossils preserved structures in different stages of cleavages, they were commonly interpreted as resting eggs and embryos of metazoan. Due to the shortage of trustworthy evidence of gastrula and hatching, their phylogenetic affinity remains a problem of long controversy. Based on new data of the phosphatized spheroidal fossils found in Doushantuo phosphorites in Weng'an, the authors found some phosphatized gastrula, colonial blue green algae, questionable sponge animal and vase shaped problematic fossils in addition to the reported resting eggs and embryos. It is obvious that the phosphatized spheroidal fossil assemblage found in Weng'an consists of cyanobacteria, benthic multicellular algae, planktonic acritarchs and other fossils with uncertain assignments, which seem to constitute an exceptionally well preserved phosphatized fossil Lagerst?tten.