The glacial erosion of most of the Shasta lavas produces detritus, composed of rough, sub-angular boulders of moderate size and of porous gravel and sand, which yields freely to the transporting power of running water.

大部分 Shasta 熔岩的冰川侵蚀产生碎屑，由中等大小的粗糙、亚角巨石和多孔砾石和沙子组成，自由地屈服于流水的输送能力。