These are known as the " Dead Rivers of California, " and the gravel deposited in them is comprehensively called the " Blue Lead" .

这些被称为“加利福尼亚的死河” ，其中沉积的砾石被统称为“蓝铅” 。

Stream sections show the gravel deposit to be composed of the same material as the moraines, but finer, and more water-worn from the action of converging torrents issuing from the tributary glaciers after the trunk was melted.

溪流剖面显示砾石沉积物由与冰碛相同的材料组成，但更细，并且在主干融化后从支流冰川流出的汇聚激流的作用下磨损更多。