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Glacial Lake Wisconsin 20,000 years ago with modern counties for geographical context. Glacial Lake Wisconsin was a prehistoric proglacial lake that existed from approximately 18,000 to 14,000 years ago, at the end of the last ice age, in the central part of present-day Wisconsin in the United States.
The Wisconsin glaciation extended from about 75,000 to 11,000 years ago, between the Sangamonian Stage and the current interglacial, the Holocene. The maximum ice extent occurred about 25,000–21,000 years ago during the last glacial maximum, also known as the Late Wisconsin in North America. The Last Glacial Period caused a much lower global ...
However, the Dells itself was never covered by glacial ice sheets – it was part of the large Driftless Area that was bypassed by the ice. The melting of the glacier formed Glacial Lake Wisconsin, a lake about the size of Great Salt Lake in Utah and as deep as 150 feet (45 m). The lake was held back by an ice dam of the remaining glacier.
These potholes are the result of glacier activity in the Wisconsin glaciation, which ended about 10,000 years ago. The decaying ice sheet left behind depressions formed by the uneven deposition of till as buried ice blocks melted in ground moraines. [1] These depressions are called potholes, glacial potholes, kettles, or kettle lakes.
The state park is known for its 500-foot-high (150 m) quartzite bluffs along the 360-acre (150 ha) Devil's Lake, which was created by a glacier depositing terminal moraines that plugged the north and south ends of the gap in the bluffs during the last ice age approximately 12,000 years ago.
Wisconsin is bordered by Lake Superior in the north and Lake Michigan in the east. [36] The state has over 15,000 named lakes, totaling about 1 million acres (4,000 km 2). Within Wisconsin, Lakes Superior and Michigan total 6.4 million acres (26,000 km 2). [37] Along the two great lakes, Wisconsin has over 500 miles (800 km) of shoreline. [38]
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