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Generalized Geologic Map of the Conterminous United States
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  The North American Tapestry of Time and Terrain

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Baraboo Range

 

Map of  Baraboo Range

A window into an ancient continent, the Baraboo Range in southern Wisconsin appears as a small east-west trending patch of orange about 25 miles (40 km) long. The Baraboos are composed of resistant Precambrian quartzite (a metamorphic rock) which has formed an erosional remnant (called a monadnock after the isolated New Hampshire mountain), resulting in topographic prominence. The mountains may have formed as long ago as the late Precambrian. These formations were buried by Paleozoic sedimentary strata and are still being uncovered by the erosion of the softer, overlying rocks.