Wanderlust World Wanderlust World During the most recent Ice Age—the Pleistocene (2.6 million to 11,700 years ago)—glaciers repeatedly advanced over North America. The most extensive glaciation was the Wisconsinan Glaciation (approx. 110,000 to 10,000 years ago), when massive ice sheets covered most of Canada and the northern United States, reaching as far south as the Ohio and Missouri River valleys.