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
称为「休伦」，
其遗迹在加拿大南部休伦湖北方
岩石中清晰可见。
,河作用
;河;河，川;
;;;;;;情况;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.
第一次称为「休伦」，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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