Liptobiolites occur only in the primary generation and in the early stage of the middle generation.
残植煤类仅出现在初始世代和中期世代的早期阶段。
Mechanism of secondary hydrocarbon generation was discussed and considered to be continuous with the primary generation.
对二次生烃机理进行了讨论，认为二次生烃与一次生烃连续。
Mechanism of secondary hydrocarbon generation was discussed and considered to be continuous with the primary generation.
对二次生烃机理进行了讨论，认为二次生烃与一次生烃连续。
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