lower Cambrian series

• 下寒武统

lower Cambrian series的用法和样例：

例句

1. Dolostone is the main rock type of the Cambrian in this area.
   从下寒武统石龙洞组开始都是白云岩沈积。
2. The closure of Kabei structure decreased to some extent, but the conditions still existed for the formation of relic Lower-Middle Cambrian gas reservoirs.
   卡拉构造的圈闭幅度有所减小，但仍具备形成中下寒武统残存气藏的条件。