中祁连地块东段元古宙基底一般认为由３ 套地层组成，即古元古代湟源群、中元古代长城系湟中群和蓟县系花石山群，三者之间皆为平行不整合关系。但新的研究表明：（１） 花石山群与下伏的湟源群为角度不整合，结合新近发现的化石资料分析，认为花石山群是震旦纪—寒武纪稳定盖层沉积，不应归于基底组成部分；（２） 湟源群与湟中群为同一构造层，统称湟源群。 The middle Proterozoic basement of the eastern Qilian block is generally considered to be composed of three sets of strata, that is, Paleoproterozoic group, Paleozoic ancient Great Wall system, Zhongshi Group and Jixian Department Huashishishan group, all of which are parallel Integrate relationships. However, new studies show that: (1) The Huashishishan Group and the underlying Jiyuan Group are not angularly integrated. Based on the newly discovered fossil data, it is believed that the Huashishishan Group was deposited during the Sinian- Cambrian stable caprock, Should be attributed to the basal component; (2) 湟 source group and 湟 Zhong group for the same structural layer, collectively 湟 source group.