冰川漂砾的形成年代通常难以直接测定，并且漂砾形成以后是否被再次搬运或者移动过，更是无法知道。
The ages of drift boulders are usually very difficult to be dated directly, and it is harder to know whether the boulders have been re-transported or rolled over since their formation.
漂砾是由冰川搬运并在距发源地一定距离的地方堆积的巨砾。
Erratics ate boulders transported by glaciers and deposited some distance from their point of origin.
应用推荐