纪山

玉溪地区震旦纪陡山沱组是该区震旦纪的主要含铜层位。

In Yuxi region , the Sinian Doushantuo Formation is the main Cu-bearing horizon of sinian strata in this region .

息烽磷矿是黔中元古代震旦纪陡山沱期磷块岩矿床的重要组成部分。

The phosphorus reserves in Xifeng are a main composition of phosphorus rock deposit formed during the Sinian Period in the center of Guizhou .

在第三纪的喜山期岩浆活动较强烈，因此，坳陷内第三纪火成岩分布广泛。

The Tertiary igneous rocks broadly distribute in this depression , since of magmatic activity was very frequent during the Xishan Epoch .

当其被发现的两个世纪以后，在寒武纪命名的威尔士山，没有人知晓爆发的原因。

But two centuries after it was noticed , in the mountains of Wales after which the Cambrian period is named , nobody knows what detonated it .

元古代末－寒武纪是北祁连山与海相火山岩有关的块状铜多金属硫化物矿床的主要成矿时期。

Abstract The period from the end of Late Proterozoic Era to Cambrian is an important metallogenic epoch of the massive sulfide copper-polymetallic deposits , which occurs in marine volcanic rocks .