The first of these glacial periods is often called the Huronian glaciation because it is well exposed in rocks just north of Lake Huron in southern Canada.
第一次冰期称
「
冰期」，因其遗迹在加拿大南
湖北方的岩石中清
可见。
偏统；仑统The first of these glacial periods is often called the Huronian glaciation because it is well exposed in rocks just north of Lake Huron in southern Canada.
第一次冰期称「冰期」，因其遗迹在加拿大南湖北方的岩石中清可见。
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