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.
第一次冰期称为「休伦冰期」，因其遗迹在加拿大南部休伦湖北方
岩石中清晰可见。
成冰,冰河作用
;;;;;;;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.
第一次冰期称为「休伦冰期」，因其遗迹在加拿大南部休伦湖北方岩石中清晰可见。
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