sinian system

• 震旦系

sinian system的用法和样例：

例句

1. Iron ore bodies all occur within the skarn located near the contact zone between the gabbro and the Sinian epi_metamorphic rocks.
   铁矿体的产出严格受辉长岩与震旦系浅变质岩接触带附近的矽卡岩控制。