Yanshanian Period

• 燕山期

Yanshanian Period的用法和样例：

例句

1. The volcanic rocks of Yanshan Period have features of the mantle source.
   燕山期火山岩具备幔源特征。
2. The Yanshanian ductile shearing resulted in further enrichment of gold and antimony.
   燕山期叠加的脆性变形使金锑矿进一步富集。