结果表明，镘头组下部的硅质层是同生期生物化学作用成因的，形成于潮下低能浅水环境；

The siliceous rocks of the lower Mantou formation were resulted from the biochemical action during the sedimentary period and formed in the environment of low-tide shallow sea.

youdao

结果表明，镘头组下部的硅质层是同生期生物化学作用成因的，形成于潮下低能浅水环境；

The siliceous rocks of the lower Mantou formation were resulted from the biochemical action during the sedimentary period and formed in the environment of low-tide shallow sea.

youdao