the Paleozoic group

• 古生界

the Paleozoic group的用法和样例：

例句

1. The paleozoic source rock in North China went into the main oil generating period at the end of Triassic.
   华北地区古生界生油岩在三叠纪末已进入主要生油期。
2. Negative reversal structure and the fault - block type buried hills are very common in Palaeozoic group in Tongwang area of Dongying Sag.
   负反转构造和断块型古潜山普遍存在于东营凹陷通王地区古生界之中。