19世纪晚期，在地质学家对这些冰川沉积进行定位的时候，他们意识到有好几个漂流层，位置较低的对应的是更早的冰川期。
As geologists mapped glacial deposits in the late nineteenth century, they became aware that there were several layers of drift, the lower ones corresponding to earlier ice ages.
亚洲末次冰期冰川发育特征的深入研究表明，末次冰期冰川规模早期大于晚期。
It has been accepted that the glacier extent in the early stage was longer than that in the late stage in eastern Asia during the Last Glaciation.
在新元古代晚期地球上曾发生过全球性的冰川作用，一些学者称之为“雪球”事件。
Global glaciations took place in the earth in Neoproterozoic, which are called the "Snowball earth" event by some scholars.
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