Paleozoic erathem

• 古生界

Paleozoic erathem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. The scheelite orebody of the Yangjingou mining area occurred in the contact zone of the lower Paleozoic Wudaogou Group strata and the Indo-Sinian adamellite.
   杨金沟矿区白钨矿体产于下古生界五道沟群地层与印支期二长花岗岩内外接触带中。