Paleozoic erathem的用法和樣例：
例句
- The paleozoic source rock in North China went into the main oil generating period at the end of Triassic.
華北地區古生界生油巖在三疊紀末已進(jìn)入主要生油期。 - 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.
楊金溝礦區白鎢礦體產(chǎn)于下古生界五道溝群地層與印支期二長(cháng)花崗巖內外接觸帶中。
