Now it is thought that two formations were formed in the same period from early cambrian to early ordovician and were deposited in different parts of sea basin on the northern edge of the north china platform , based on the acritarchs contained in these formations 通过对以上两个组中疑源类化石进行研究，认为阿牙登组应从白云鄂博群中分出，与腮林忽洞组一同划归早寒武世至早奥陶世的地层中，阿牙登组与腮林忽洞组为同一时期不同局限海盆的沉积，是早古生代华北地台最北部边缘的沉积产物。
5 ) the lophophores at trocholophe stage in heliomedusa orienta are tentatively interpreted here . 6 ) the mineralization of the animal took place gradually from outside to inside during their preservation before the fresh carcass were broken down , which could have given access to the preservation of the softy anatomy of organisms in chengjiang fauna 第五章基于澄江动物群中的腕足动物化石，对腕足动物的演化做了初步的探讨，认为腕足动物在早寒武世己经出现了大量的分异，其形态己经相当进化。
Phosphate deposits are distributed along the margin , platform and basin in the west yangtze area . the analysis methods include the paleogeography , petrology , organic geochemistry , geochemistry . the conclusions are drawn that the source of phosphate deposits distributed along the margin originate from the weathering production of continent , while phosphate deposits along the platform and basin gain phosphorus through hot spring on the buttom of the sea floor , which is brought to the sedimentary environment by rising sea - fluid , then accumulated by the organism and microorganism , meanwhile , basin phosphorite keep relatively higher organic carbon content 认为早寒武世早期古陆遭受风化，被剥蚀下来的产物成为潮坪型磷块岩的主要磷质来源，在碳酸盐岩台地发生的热点活动和上升洋流从盆底深部带来的磷质，共同作为台地型磷块岩的磷源，盆地型磷块岩的磷质同样是由热点活动和上升流携带至缺氧的沉积环境中，通过藻类或微生物的富集作用成岩，并保留了较高的有机碳含量。
