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」，因在加拿大南部休伦湖方的岩石中清晰可见。

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方的岩石中清晰可见。

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.

第一次期称为「期」，因其遗迹在加拿大南部湖方的岩石中清晰可见。

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方的岩石中清晰可见。

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.

第期称为「休伦期」，因其遗迹在加拿大南部休伦湖方的岩石中清晰可见。

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「伦冰期」，因其遗迹在加拿大伦湖方的清晰可见。

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「伦冰期」，因其遗迹在加拿大南部伦湖方的岩石中清晰可见。

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「伦冰期」，因其遗迹在加拿大伦湖方的清晰可见。

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方的岩石中清晰可见。

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方的岩石中清晰可见。