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.
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.
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