It was this midcontinental corridor between two massive ice sheets—the Laurentide to the east and the Cordilleran to the west—that enabled the southward migration.
正是这条位于两块巨大冰原之间的大陆中部走廊——东部是月桂树冰原，西部是科迪勒兰冰原——促成了向南的迁移。
Their findings were presented recently at the the Rocky Mountain and Cordilleran Joint Meeting of the Geological Society of America.
他们的研究结果于近期在美国地质协会洛矶山脉与科迪勒拉山系联合会议上公布。
Their findings were presented recently at the the Rocky Mountain and Cordilleran Joint Meeting of the Geological Society of America.
他们的研究结果于近期在美国地质协会洛矶山脉与科迪勒拉山系联合会议上公布。
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