沉积于冰前湖底或海底的细粒沉积物中间的大石块。
A large rock fragment, deposited in the midst of the fine-grained sediments on the floor of a proglacial lake or of the sea.
在一些地区，粗粒沉积物可充填于切入较细粒的沉积物或岩石的溪流或河流的水道内。
In some areas, coarse sediments can fill channels of streams or rivers that cut through finer grained sediments or rocks.
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