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Autumn in the Driftless Area of Cross Plains, Wisconsin. The Driftless Area, also known as Bluff Country and the Paleozoic Plateau, is a topographic and cultural region in the Midwestern United States [1] that comprises southwestern Wisconsin, southeastern Minnesota, northeastern Iowa, and the extreme northwestern corner of Illinois.
Unmetamorphosed sedimentary rocks are found in the rock record from the Cambrian, in the early Paleozoic.The feldspathic quartz sandstone and orthoquartz sandstone of Chequamegon, Devils Island and Orienta formations make up the Bayfield Group which underlies the entire Lake Superior shoreline of the state from Chequamecon Bay to the St. Louis River in the west.
The Baraboo Range is a monadnock in Sauk and Columbia Counties and a National Natural Landmark formed 1.6 billion years ago featuring Devil's Lake, an endorheic lake. Its first use appears to have been in Edwin James' three-volume work, "An Account of an Expedition from Pittsburgh to the Rocky Mountains , Performed in the Years 1819, 1820 ...
Wisconsin is divided into five geographic regions. The Driftless Area of southwestern Wisconsin is characterized by bluffs carved in sedimentary rock by water from melting Ice age glaciers. Pictured is the confluence of the Mississippi and Wisconsin rivers. Sea caves are located on the shorelines of the Apostle Islands in Lake Superior.
Wisconsin is located in the East North Central United States, and is considered to be a part of the Midwest. [3] The state has a total area of 65,496 square miles (169,630 km 2), making it the 23rd largest U.S. State. [4] [5] Of this area, 17% is water, primarily Lake Michigan, Superior, and the many inland lakes in Wisconsin. [6]
Based on the large size of the sand volcanoes, the quake must have been at least a 7 or an 8 magnitude — approaching the size of the Great 1906 San Francisco earthquake.
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Baraboo Range in winter Looking east down the range on Wisconsin Highway 78. The Baraboo Range is a mountain range in Columbia County and Sauk County, Wisconsin. Geologically, it is a syncline fold consisting of highly eroded Precambrian metamorphic rock. It is about 25 miles (40 km) long and varies from 5 to 10 miles (16 km) in width.