| 释义 |
Lower Carboniferous
基本英英例句
下石炭统
Noun:
from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insectsYamansu Formation of theLower Carboniferouscomprises the main ore-bearing formation in the Xiaoshitouquan ore district.摘要小石头泉矿区主含矿层为下石炭统雅满苏组第二亚组，火山穹隆及伴生断裂为主要的控矿构造。 |