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Geologic history, stratigraphy and tectonics [ edit ] The oldest Precambrian rocks in Wisconsin are late Archean quartzofeldspathic gneiss , migmatite and amphibolite up to three billion years old and igneous rock such as the granite of the Puritan Quartz Monzonite.
Where the Wisconsin River turns west to join the Mississippi, the area to the south, including the whole of Grant County as well as most of Lafayette County, are part of the Driftless Area. The rugged terrain comprising most of the Driftless Area is distinct from the rest of Wisconsin, and is known locally as the Coulee Region. The steep ridges ...
Wisconsin has geologic formations and deposits that vary in age from over three billion years to several thousand years, with most rocks being millions of years old. [28] The oldest geologic formations were created over 600 million years ago during the Precambrian, with the majority being below the glacial deposits.
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 geological history of North America comprises the history of geological occurrences and emergence of life in North America during the ... [117] or Wisconsin. ...
Roadside Geology of Wisconsin [2] 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 .
Kettle Moraine is a large moraine in the state of Wisconsin, United States. It stretches from Walworth County in the south to Kewaunee County in the north. It has also been referred to as the Kettle Range and, in geological texts, as the Kettle Interlobate Moraine .
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