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太古代胶东群主要是由ＴＴＧ花岗质片麻岩组成。近期区调研究发现真正的变质表壳岩系仅在其中呈包体出现，据岩性特征胶东岩群可分为苗家岩组、郭格庄岩组，时代为晚太古代
Archean Jiaodong group is mainly composed of TTG granitic gneiss. According to recent regional studies, the genuine metamorphic crustal rocks show up as enclaves only. According to the lithological characteristics, the Jiaodong Rock Group can be divided into Miaojiayan Formation and Guogezhuangyan Formation, and the age is Late Archean