A large rock fragment, deposited in the midst of the fine-grained sediments on the floor of a proglacial lake or of the sea.

沉积于冰前湖底或海底的细粒沉积物中间的大石块。

youdao

A large rock fragment, deposited in the midst of the fine-grained sediments on the floor of a proglacial lake or of the sea.

沉积于冰前湖底或海底的细粒沉积物中间的大石块。

youdao