glaciation
🇬🇧/ˌɡleɪsiˈeɪʃn/ 🇺🇸/ˌɡleɪʃiˈeɪʃn/ 6In geology, glaciation is the process by which the land is covered by glaciers. Glaciations are periods when this happens. 冰蚀期
noun [抽象名词][地质] 冰川作用；冻结成冰
The problem with ascribing all tillites to glaciation, however, is that tillite deposits are widespread in Precambrian sediments.
然而，使所有的黑土形成冰川作用的问题是，在前寒武纪沉积物中广泛分布有黑土。
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