Annotated record of the detailed examination of Mn deposits from DSDP Site 49...
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At Sites 47 and 48, impenetrable and cherty Upper Cretaceous chalks were found. The upper part of what infer to be lower Cretaceous is even more reflective, and likely to be...
在47号和48号测点中，发现了致密且含燧石的上白垩统白垩岩。据推断属于下白垩统的地层上部反射性更强，且极有可能为……
