The Longshoushan Group of Paleoproterozoic age in the Dongdashan district is a metamorphic terrane composed of metamorphic rocks of amphibolite facies.
东大山地区龙首山岩群形成于早元古代，是一套经角闪岩相变质改造的变质地质体。
2
The Jiaodong event, which took place after formation of the Archaean Jiaodong Group, caused the first phase of N-S structures and syntectonic granulite facies metamorphism.
继太古代胶东群形成之后的胶东事件，在胶东群中造成了第一期的南北向构造和同构造麻粒岩相高级区域变质。
3
Introducing into air drilling, nitrogen drilling and air percussion drilling were applied in Puguang upper continental facies stratum; moreover, drilled successfully into Xujiahe group stratum.