The Nonesuch could be considered the oldest actively expelling oil source bed.

农萨奇页岩可能是最古老的还在排油的烃源岩.

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Therefore, ore prospecting was cast about for source bed.

因此, 找矿重点是寻找矿源层.

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Source bed is a material base and essential condition of mineralization.

矿源层是成矿作用的物质基础和必备条件.

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